阅读说明：本技术 树脂组合物和树脂成型品 (Resin composition and resin molded article ) 是由 宫崎佳奈 田中凉 八百健二 于 2019-03-04 设计创作，主要内容包括：本发明涉及树脂组合物和树脂成型品。所提供的树脂组合物含有纤维素酰化物(A)、至少一种聚合物(B)和增塑剂(C),所述至少一种聚合物(B)选自由下述组成的组：具有芯-壳结构的聚合物(b1),所述聚合物(b1)包括含有丁二烯聚合物的芯层和壳层,该壳层位于所述芯层表面上并且含有选自苯乙烯聚合物和丙烯腈-苯乙烯聚合物的聚合物；苯乙烯-乙烯-丁二烯-苯乙烯共聚物(b2)；聚氨酯(b3)；和芳香族聚酯(b4)。通过使树脂组合物成型而获得的树脂成型品满足下列条件(1)和(2)中的至少一个：(1)根据ASTM D648-07 B方法测量的热变形温度为95℃以下；和(2)根据ISO 75-2 A方法(2013)测量的热变形温度为80℃以下。(The present invention relates to a resin composition and a resin molded article. The resin composition contains a cellulose acylate (A), at least one polymer (B) and a plasticizer (C), the at least one polymer (B) being selected from the group consisting of: a polymer (b1) having a core-shell structure, the polymer (b1) comprising a core layer comprising a butadiene polymer and a shell layer located on a surface of the core layer and comprising a polymer selected from the group consisting of a styrene polymer and an acrylonitrile-styrene polymer; styrene-ethylene-butadiene-styrene copolymer (b 2); polyurethane (b 3); and an aromatic polyester (b 4). A resin molded article obtained by molding the resin composition satisfies at least one of the following conditions (1) and (2): (1) a heat distortion temperature of 95 ℃ or less as measured according to ASTM D648-07B; and (2) a heat distortion temperature of 80 ℃ or less as measured according to ISO75-2A method (2013).)

1. A resin composition comprising:

cellulose acylate (a);

at least one polymer (B) selected from the group consisting of:

a polymer (b1) having a core-shell structure, the polymer (b1) comprising:

a core layer comprising a butadiene polymer, and

a shell layer located on a surface of the core layer and containing a polymer selected from the group consisting of styrene polymers and acrylonitrile-styrene polymers;

styrene-ethylene-butadiene-styrene copolymer (b 2);

polyurethane (b 3); and

an aromatic polyester (b 4); and

a plasticizer (C) for imparting a specific surface texture to the substrate,

wherein a resin molded article obtained by molding the resin composition satisfies at least one of the following conditions (1) and (2):

(1) a heat distortion temperature of 95 ℃ or less as measured according to ASTM D648-07B; and

(2) a heat distortion temperature measured according to ISO75-2A method (2013) of 80 ℃ or lower.

2. The resin composition of claim 1, satisfying at least one of the following conditions: a heat distortion temperature under the condition (1) is 90 ℃ or less, and a heat distortion temperature under the condition (2) is 85 ℃ or less.

3. The resin composition according to claim 1 or 2, wherein the cellulose acylate is at least one selected from the group consisting of cellulose acetate, cellulose acetate propionate and cellulose acetate butyrate.

4. The resin composition according to claim 3, wherein the cellulose acylate is at least one selected from the group consisting of the cellulose acetate propionate and the cellulose acetate butyrate.

5. The resin composition according to any one of claims 1 to 4, further comprising an aliphatic polyester (D).

6. The resin composition according to claim 5, wherein the aliphatic polyester (D) is polyhydroxyalkanoate.

7. The resin composition according to claim 6, wherein the aliphatic polyester (D) is polylactic acid.

8. The resin composition according to any one of claims 1 to 7, wherein the plasticizer (C) is at least one selected from the group consisting of: a cardanol compound, a dicarboxylic acid diester, a citric acid ester, a polyether compound having one or more unsaturated bonds in the molecule, a polyether ester compound, a benzoic acid glycol ester, a compound represented by the following general formula (6), and an epoxidized fatty acid ester:

wherein, in the general formula (6),

R⁶¹represents an aliphatic hydrocarbon group having 7 to 28 carbon atoms; and is

R⁶²Represents an aliphatic hydrocarbon group having 1 to 8 carbon atoms.

9. A resin molded article comprising the resin composition as defined in any one of claims 1 to 8.

10. The resin molded article according to claim 9, which is an injection molded article.

Technical Field

The present invention relates to a resin composition and a resin molded article.

Background

Patent document 1 discloses "a resin composition containing a cellulose ester resin in an amount of 50phr to 99phr and an acrylonitrile-butadiene-styrene resin in an amount of 1phr to 50phr, the resin composition comprising a surface layer containing an acrylonitrile-styrene copolymer on a core surface of a butadiene polymer".

Patent document 2 discloses "an elastomeric composition containing at least one non-fibrillated cellulose ester, at least one non-nitrile primary elastomer, optionally starch, and one or more fillers in an amount of at least 70 parts per 100 parts rubber (phr), wherein the weight ratio of cellulose ester to starch is at least 3:1, the cellulose ester is in the form of particles having an average diameter of 10 μm or less.

Patent document 3 discloses "a cellulose ester composition containing: (A)100 parts by mass of a cellulose ester, (B)2 to 100 parts by mass of a plasticizer, (C)0.5 to 10 parts by mass of a methyl methacrylate resin (containing no elastomer), and (D)1 to 50 parts by mass of a thermoplastic elastomer containing an alkyl (meth) acrylate unit ".

Patent document 4 discloses "a resin composition containing a cellulose ester compound (a), a poly (meth) acrylate compound (B) containing 50 mass% or more of a constituent unit derived from an alkyl (meth) acrylate, a polyester resin (C), and at least one polymer (D) selected from a polymer having a core-shell structure including a core layer and a shell layer containing an alkyl (meth) acrylate polymer on the surface of the core layer, and an olefinic polymer which is a polymer of α -olefin and alkyl (meth) acrylate and contains 60 mass% or more of a constituent unit derived from α -olefin".

Patent document 5 discloses "a cellulose ester composition containing 55 to 99 mass% of at least one cellulose ester, 1 to 30 mass% of at least one impact modifier, and at least one plasticizer of 15 mass% or less".

Reference list

Patent document

Patent document 1: JP-A-2015-

Patent document 2: JP-A-2015-505877

Patent document 3: JP-A-2015-044975

Patent document 4: JP-B-6323605

Patent document 5: WO 2008/089573

Disclosure of Invention

A resin molded article obtained by molding a resin composition containing a cellulose acylate has a high friction coefficient. Therefore, for example, when a resin molded article containing cellulose acylate is rubbed, squeak noise tends to be generated.

An object of the present invention is to provide a resin composition, compared with a case where a resin molded article, which is obtained by molding a resin composition containing a cellulose acylate and has a heat distortion temperature measured according to ASTM D648-07B method, exceeds 95 ℃ and a heat distortion temperature measured according to ISO75-2A method (2013) exceeds 80 ℃, or compared with a case where a resin composition contains only a cellulose acylate (A) and at least one polymer (B) (wherein the polymer (B) is selected from the group consisting of a polymer (B1) having a core-shell structure, the polymer (B1) includes a shell layer containing a polymer selected from the group consisting of a styrene polymer and an acrylonitrile-styrene polymer, a styrene-ethylene-butadiene-styrene copolymer (B2), a polyurethane (B3), and an aromatic polyester (B4)), the resin composition provided by the invention can form a resin molding product for preventing creak noise.

Specific means for achieving the above object include the following aspects.

<1> according to one aspect of the present disclosure, there is provided a resin composition comprising:

cellulose acylate (a);

at least one polymer (B) selected from the group consisting of:

a polymer (b1) having a core-shell structure, the polymer (b1) comprising:

a core layer comprising a butadiene polymer, and

a shell layer located on a surface of the core layer and containing a polymer selected from the group consisting of styrene polymers and acrylonitrile-styrene polymers;

styrene-ethylene-butadiene-styrene copolymer (b 2);

polyurethane (b 3); and

an aromatic polyester (b 4); and

a plasticizer (C) for imparting a specific surface texture to the substrate,

wherein a resin molded article obtained by molding the resin composition satisfies at least one of the following conditions (1) and (2):

(1) a heat distortion temperature of 95 ℃ or less as measured according to ASTM D648-07B; and

(2) a heat distortion temperature measured according to ISO75-2A method (2013) of 80 ℃ or lower.

<2> the second aspect of the present invention provides the resin composition as stated in <1>, which satisfies at least one of the following conditions: a heat distortion temperature under the condition (1) is 90 ℃ or less, and a heat distortion temperature under the condition (2) is 85 ℃ or less.

<3> the third aspect of the present invention provides the resin composition as <1> or <2>, wherein the cellulose acylate is at least one selected from the group consisting of cellulose acetate, cellulose acetate propionate and cellulose acetate butyrate.

<4> A fourth aspect of the present invention provides the resin composition as <3>, wherein the cellulose acylate is at least one selected from the group consisting of the cellulose acetate propionate and the cellulose acetate butyrate.

<5> the fifth aspect of the present invention provides the resin composition as stated in any one of <1> to <4>, further containing an aliphatic polyester (D).

<6> A sixth aspect of the present invention provides the resin composition as <5>, wherein the aliphatic polyester (D) is polyhydroxyalkanoate.

<7> the seventh aspect of the present invention provides the resin composition <6>, wherein the aliphatic polyester (D) is polylactic acid.

<8> an eighth aspect of the present invention provides the resin composition as described in any one of <1> to <7>, wherein the plasticizer (C) is at least one selected from the group consisting of: cardanol compound, dicarboxylic acid diester, citric acid ester, polyether compound having one or more unsaturated bonds in the molecule, polyetherester compound, benzoic acid glycol ester (glycolate), compound represented by the following general formula (6), and epoxidized fatty acid ester:

in the general formula (6), R⁶¹Represents an aliphatic hydrocarbon group having 7 to 28 carbon atoms; and R is⁶²Represents an aliphatic hydrocarbon group having 1 to 8 carbon atoms.

<9> A ninth aspect of the present invention provides a resin molded article comprising the resin composition of any one of <1> to <8 >.

<10> the tenth aspect of the present invention provides the resin molded article <9>, wherein the resin molded article is an injection molded article.

According to the inventions of <1> and <2>, there is provided a resin composition, as compared with a case where a resin molded article obtained by molding a resin composition containing a cellulose acylate and obtained by molding the resin composition has a heat distortion temperature measured according to the ASTM D648-07B method exceeding 95 ℃ and a heat distortion temperature measured according to the ISO75-2A method (2013) exceeding 80 ℃, or as compared with a case where a resin composition contains only a cellulose acylate (A) and at least one polymer (B) (wherein the polymer (B) is selected from the group consisting of a polymer (B1) having a core-shell structure, the polymer (B1) includes a shell layer containing a polymer selected from the group consisting of a styrene polymer and an acrylonitrile-styrene polymer, a styrene-ethylene-butadiene-styrene copolymer (B2), a polyurethane (B3), and an aromatic polyester (B4)), the resin composition can form a resin molded product which prevents squeaking noise.

According to the invention of <3>, there is provided a resin composition wherein the cellulose acylate (A) is at least one selected from the group consisting of cellulose acetate, cellulose acetate propionate and cellulose acetate butyrate, as compared with a case where a heat distortion temperature measured according to ASTM D648-07B method of a resin molded article obtained by molding the resin composition exceeds 95 ℃ and a heat distortion temperature measured according to ISO75-2A method (2013) exceeds 80 ℃, or as compared with a case where the resin composition contains only the cellulose acylate (A) and at least one polymer (B) (wherein the polymer (B) is selected from the group consisting of a polymer (B1) having a core-shell structure, the polymer (B1) includes a shell layer containing a polymer selected from the group consisting of a styrene polymer and an acrylonitrile-styrene polymer; styrene-ethylene-butadiene- Styrene copolymer (b 2); polyurethane (b 3); and aromatic polyester (b4)), and provides a resin composition capable of forming a resin molded article which prevents squeaking noise.

According to the invention of <4>, there is provided a resin composition which is capable of forming a resin molded article preventing squeak noise as compared with the case where the cellulose acylate (a) is cellulose acetate.

According to the inventions of <5> to <7>, there is provided a resin composition further comprising an aliphatic polyester (D), compared with a case where a heat distortion temperature measured according to the ASTM D648-07B method of a resin molded article obtained by molding the resin composition exceeds 95 ℃ and a heat distortion temperature measured according to the ISO75-2A method (2013) exceeds 80 ℃, or compared with a case where the resin composition contains only a cellulose acylate (A) and at least one polymer (B) (wherein the polymer (B) is selected from the group consisting of a polymer (B1) having a core-shell structure, the polymer (B1) includes a shell layer containing a polymer selected from the group consisting of a styrene polymer and an acrylonitrile-styrene polymer; a styrene-ethylene-butadiene-styrene copolymer (B2), a polyurethane (B3); and an aromatic polyester (B4)), the resin composition can form a resin molded product which prevents squeaking noise.

According to the invention of <8>, there is provided a resin composition capable of forming a resin molded article which prevents squeak noise, as compared with the case where the plasticizer (C) is polyethylene glycol.

According to the inventions of <9> and <10>, there is provided a resin molded article or an injection molded article, as compared with a case where a heat distortion temperature measured according to the ASTM D648-07B method of a resin molded article obtained by molding a resin composition exceeds 95 ℃ and a heat distortion temperature measured according to the ISO75-2A method (2013) exceeds 80 ℃, or as compared with a case where a resin composition contains only a cellulose acylate (A) and at least one polymer (B) (wherein the polymer (B) is selected from the group consisting of a polymer (B1) having a core-shell structure, the polymer (B1) includes a shell layer containing a polymer selected from the group consisting of a styrene polymer and an acrylonitrile-styrene polymer, a styrene-ethylene-butadiene-styrene copolymer (B2), a polyurethane (B3), and an aromatic polyester (B4)), the resin molded article or the injection molded article can prevent squeaking noise.

Detailed Description

Exemplary embodiments will be described below as examples of the present invention. These descriptions and examples illustrate exemplary embodiments and do not limit the scope of the present invention.

In the exemplary embodiment, the numerical range represented by using "to" shows a range including numerical values recited before and after "to" as a minimum value and a maximum value, respectively.

In the numerical ranges described in steps in the exemplary embodiment, the upper or lower limit value recited in one numerical range may be replaced with the upper or lower limit value of the numerical range in the other step-wise description. In addition, in the numerical ranges described in the exemplary embodiments, the upper limit value or the lower limit value of the numerical range may be replaced with the values shown in the examples, respectively.

In the exemplary embodiment, the term "process" includes not only one independent process but also a process which is not clearly distinguished from other processes as long as the intended purpose of the process is achieved.

In an exemplary embodiment, each component may contain a plurality of corresponding substances. In exemplary embodiments, when referring to the amount of each component in a composition, it refers to the total amount of the plurality of materials present in the composition in the presence of the plurality of materials corresponding to each component in the composition, unless otherwise specified.

In exemplary embodiments, "(meth) acrylic acid" means at least one of acrylic acid and methacrylic acid, and "(meth) acrylate" means at least one of acrylate and methacrylate.

In an exemplary embodiment, the cellulose acylate (a), the polymer (B), the plasticizer (C), the aliphatic polyester (D) are also referred to as a component (a), a component (B), a component (C) and a component (D), respectively.

< resin composition >

The resin composition of the exemplary embodiment includes cellulose acylate (a), a polymer (B), and a plasticizer (C). The polymer (B) is at least one member of the group consisting of: a polymer having a core-shell structure (b 1); styrene-ethylene-butadiene-styrene copolymer (b 2); polyurethane (b 3); and an aromatic polyester (b4), the polymer (b1) comprising a core layer comprising a butadiene polymer and a shell layer located on a surface of the core layer and comprising a polymer selected from the group consisting of a styrene polymer and an acrylonitrile-styrene polymer.

Next, a resin molded article obtained by molding the resin composition satisfies at least one of the following conditions (1) and (2):

(1) a heat distortion temperature of 95 ℃ or less as measured according to ASTM D648-07B; and

(2) a heat distortion temperature measured according to ISO75-2A method (2013) of 80 ℃ or lower.

The resin composition of the exemplary embodiment may contain the aliphatic polyester (D) and other components (E), as necessary.

A resin molded article obtained by molding a resin composition containing a cellulose acylate has a high friction coefficient. Therefore, when the resin molded article containing the cellulose acylate is rubbed against other objects, for example, the resin molded articles rub against each other, squeaking noise tends to be generated. Squeak noise is thought to be caused by vibrations generated when the molded article is rubbed.

According to the resin composition of the exemplary embodiment, a resin molded article preventing squeak noise is obtained. The reason for preventing squeak noise is not clear, but is presumed as follows.

For example, when the cellulose acylate (a) is mixed with a flexible polymer, it is considered that vibration generated when rubbing a resin molded article is prevented, which vibration causes squeaking noise. However, for example, in the case of a resin molded article obtained by molding a resin composition containing only the cellulose acylate (a) and the flexible acrylic rubber-based polymer, it is difficult to prevent squeak noise in the resin molded article. It is considered that the compatibility between the cellulose acylate (a) and the flexible acrylic rubber-based polymer is too high, and therefore it is difficult to form an interface therebetween, and vibration generated when the resin molded article is rubbed cannot be absorbed. Therefore, it is considered that the cellulose acylate (a) may be mixed with a polymer (e.g., polymer (B)) such that: the polymer has lower compatibility with cellulose acylate (a) than the acrylic rubber-based polymer. However, the affinity between the cellulose acylate (a) and the polymer (B) is low. If the cellulose acylate (A) is simply mixed with the polymer (B), the dispersibility of the polymer (B) is low. Therefore, a large interface is formed in a resin molded article formed by molding a resin composition containing only the cellulose acylate (a) and the polymer (B). Meanwhile, the flexibility of the resin molded product is improved by reducing the thermal deformation temperature of the resin molded product. However, if the cellulose acylate (a) is simply mixed with the polymer (B), a large interface is generated. Therefore, the vibration still cannot be absorbed. Therefore, squeak noise may occur even if the heat distortion temperature of the resin molded product is simply lowered.

In contrast, in the resin composition of the exemplary embodiment, the plasticizer (C) is further mixed with the cellulose acylate (a) and the polymer (B), so that the affinity between the cellulose acylate (a) and the polymer (B) is suitable and the dispersibility of the polymer (B) is improved. As a result, since the interface formed between the cellulose acylate (a) and the polymer (B) is present in an appropriate amount, vibration may be absorbed at the interface formed between the cellulose acylate (a) and the polymer (B) in a resin molded article obtained by molding the resin composition. Further, when the heat distortion temperature of a resin molded article obtained by molding a resin composition containing the cellulose acylate (a), the polymer (B) and the plasticizer (C) is set to a prescribed value or less, the flexibility of the resin molded article is improved. As a result, it is presumed that squeak noise of the resin molded product containing the cellulose acylate is prevented.

The components of the resin composition of the exemplary embodiment will be described in detail below.

[ cellulose acylate (A): component (A) ]

The cellulose acylate (a) is a cellulose derivative in which at least a part of the hydroxyl groups in the cellulose are substituted (acylated) with acyl groups. Acyl is represented by the formula-CO-R^AC(R^ACRepresents a hydrogen atom or a hydrocarbon group).

The cellulose acylate (a) is, for example, a cellulose derivative represented by the following general formula (CA).

In the general formula (CA), A¹、A²And A³Each independently represents a hydrogen atom or an acyl group, and n represents an integer of 2 or more. However, n is A¹N number of A²And n is A³At least a part of (a) represents an acyl group. N number of A in molecule¹May be all the same, partially the same or different from each other. Similarly, n A's in the molecule²And n is A³May be all the same, partially the same or different from each other.

From A¹、A²And A³The hydrocarbon group in the acyl group represented may be linear, branched or cyclic, and is preferably linear or branched, more preferably linear.

From A¹、A²And A³The hydrocarbon group in the acyl group represented may be a saturated hydrocarbon group or an unsaturated hydrocarbon group, and is more preferably a saturated hydrocarbon group.

From A¹、A²And A³The acyl group represented is preferably an acyl group having 1 to 6 carbon atoms. That is, the cellulose acylate (a) is preferably a cellulose acylate (a) in which the number of carbon atoms of the acyl group is 1 to 6. The cellulose acylate (a) in which the number of carbon atoms of the acyl group is 1 to 6 is more likely to form a resin molded product in which squeak noise is prevented, as compared with the cellulose acylate (a) containing an acyl group having 7 or more carbon atoms.

From A¹、A²And A³The hydrogen atom in the acyl group represented may be substituted with a halogen atom (e.g., fluorine atom, bromine atom, and iodine atom), an oxygen atom, a nitrogen atom, or the like, and is preferably not substituted.

From A¹、A²And A³Examples of the acyl group include formyl, acetyl, propionyl, butyryl (butyryl group), acryloyl, hexanoyl, or the like. Among the above examples of the acyl group, the acyl group is more preferably an acyl group having 2 to 4 carbon atoms, and still more preferably an acyl group having 2 or 3 carbons, in terms of moldability of the resin composition and prevention of squeak noise in the resin molded product.

Examples of the cellulose acylate (a) include cellulose acetate (mono-acetate, cellulose Diacetate (DAC), cellulose triacetate), Cellulose Acetate Propionate (CAP), or Cellulose Acetate Butyrate (CAB), and the like.

The cellulose acylate (a) is preferably Cellulose Acetate Propionate (CAP) and Cellulose Acetate Butyrate (CAB), and more preferably Cellulose Acetate Propionate (CAP) in terms of preventing squeak noise in the resin molded article.

One kind of cellulose acylate may be used alone, or two or more kinds of cellulose acylate may be used in combination.

The weight-average polymerization degree of the cellulose acylate (a) is preferably 200 to 1000, more preferably 500 to 1000, and still more preferably 600 to 1000 in terms of moldability of the resin composition and prevention of squeak noise in the resin molded article.

The weight-average degree of polymerization of the cellulose acylate (a) is determined from the weight-average molecular weight (Mw) by the following procedure.

First, the weight average molecular weight (Mw) of the cellulose acylate (A) in terms of polystyrene was measured by a gel permeation chromatography device using tetrahydrofuran (GPC device: HLC-8320GPC manufactured by Tosoh Corporation, column: TSK gel α -M).

Next, the polymerization degree of the cellulose acylate (a) is determined by dividing the weight-average molecular weight (Mw) of the cellulose acylate by the molecular weight of the constitutional unit of the cellulose acylate. For example, in the case where the substituent of the cellulose acylate is an acetyl group, the molecular weight of the structural unit is 263 when the substitution degree is 2.4, and 284 when the substitution degree is 2.9.

The substitution degree of the cellulose acylate (a) is preferably 2.1 to 2.9, more preferably 2.2 to 2.9, still more preferably 2.3 to 2.9, and particularly preferably 2.6 to 2.9 in terms of moldability of the resin composition and prevention of squeak noise in the resin molded article.

In the Cellulose Acetate Propionate (CAP), the ratio of the substitution degree of acetyl group to the substitution degree of propionyl group (acetyl/propionyl group) is preferably 0.01 to 1, and more preferably 0.05 to 0.1, from the viewpoints of moldability of the resin composition and prevention of squeak noise in a resin molded product.

The CAP preferably satisfies the following (1), (2), (3) and (4), more preferably the following (1), (3) and (4), and still more preferably the following (2), (3) and (4). (1) when the CAP is measured by GPC method using tetrahydrofuran as a solvent, the weight average molecular weight (Mw) in terms of polystyrene is 160,000 to 250,000, the ratio Mn/Mz of the number average molecular weight (Mn) in terms of polystyrene to the Z average molecular weight (Mz) in terms of polystyrene is 0.14 to 0.21. (2) when the CAP is measured by GPC method using tetrahydrofuran as a solvent, the weight average molecular weight (Mw) in terms of polystyrene is 160,000 to 250,000 in terms of styrene, and the ratio (Mn/Mz) of the number average molecular weight (Mn) in terms of polystyrene to the Z average molecular weight (Mz) in terms of polystyrene is 0.14 to 0.21, and the ratio (Mn/Mz) of the weight average molecular weight (Mn) in terms of polystyrene to the Z average molecular weight (Mz) in terms of polystyrene is 0.7 to 0.21.6, and the ratio (Mn/Mz) of the weight (Mn/Mz) in terms of polystyrene to the gel viscosity when the CAP is measured by injection molding at a temperature of a temperature when the molding temperature of a vertical direction of a vertical plate injection molding temperature (20 mm), (2), (20), (8) and 35) are measured by a) when the CAP by a temperature of a vertical flow rate (19) is equal to a vertical flow rate of.

In the Cellulose Acetate Butyrate (CAB), the ratio of the substitution degree of acetyl groups to the substitution degree of butyryl groups (acetyl/butyryl groups) is preferably 0.05 to 3.5, and more preferably 0.5 to 3.0, in terms of moldability of the resin composition and prevention of squeak noise in a resin molded article.

The degree of substitution of the cellulose acylate (a) is an index indicating the degree of substitution of the hydroxyl group of the cellulose with the acyl group. That is, the degree of substitution is an index indicating the degree of acylation of the cellulose acylate (a). Specifically, the degree of substitution refers to the number of substitutions of three hydroxyl groups in the D-glucopyranose unit of the cellulose acylate by acyl groups on the average number within the molecule. Degree of substitution with¹H-NMR (JMN-ECA/manufactured by JEOL RESONANC) was determined from an integral ratio of a peak of cellulose-derived hydrogen to a peak of acyl-derived hydrogen.

[ polymer (B): component B)

Component B is at least one selected from the group consisting of: a polymer having a core-shell structure (b 1); styrene-ethylene-butadiene-styrene copolymer (b 2); polyurethane (b 3); and an aromatic polyester (b4), the polymer (b1) comprising: a core layer containing a butadiene polymer, and a shell layer located on a surface of the core layer and containing a polymer selected from the group consisting of a styrene polymer and an acrylonitrile-styrene polymer.

The component (B) is, for example, a thermoplastic elastomer having elasticity at normal temperature (25 ℃) and having the same softening property as the thermoplastic resin at high temperature.

(Polymer having core-Shell Structure (b 1): component (b1))

The polymer (b1) having a core-shell structure comprises a core layer and a shell layer on a surface of the core layer.

The polymer having a core-shell structure (b1) is a polymer in which a core layer is provided as an innermost layer and a shell layer is provided as an outermost layer (specifically, a polymer in which a shell layer is obtained by graft polymerizing a styrene polymer or an acrylonitrile-styrene polymer on a core layer containing a butadiene polymer).

One or more other layers (e.g., 1 to 6 other layers) may be provided between the core layer and the shell layer. In the case where other layers are provided, the polymer having a core-shell structure (b1) is a polymer in which a plurality of polymers are graft-polymerized to form a multilayer polymer on the polymer as a core layer.

In the case where the core layer is a copolymer of butadiene and other monomers, examples of the other monomers include a vinyl aromatic series, the vinyl aromatic series is preferably a styrene component (e.g., styrene, alkyl-substituted styrene (e.g., α -methylstyrene, 2-methylstyrene, 3-methylstyrene, 4-methylstyrene, 2-ethylstyrene, 3-ethylstyrene, 4-ethylstyrene, etc.) and a halogen-substituted styrene (e.g., 2-chlorostyrene, 3-chlorostyrene, 4-chlorostyrene, etc.)).

Specifically, the core layer containing a butadiene polymer may be, for example, a homopolymer of butadiene, a copolymer of butadiene and styrene, and a terpolymer of butadiene, styrene, and divinylbenzene.

The butadiene polymer contained in the core layer preferably contains 60 to 100 mass% (preferably 70 to 100 mass%) of a structural unit derived from butadiene, and 0 to 40 mass% (preferably 0 to 30 mass%) of a structural unit derived from other monomer (preferably a styrene component). For example, the proportion of the structural unit derived from each monomer constituting the butadiene polymer preferably satisfies the following: the content of butadiene is 60 to 100 mass% for each monomer; the content of styrene is 0 to 40 mass%; and the content of divinylbenzene is preferably 0% to 5% based on the total amount of styrene and divinylbenzene.

The shell layer containing the styrene polymer is not particularly limited as long as the shell layer contains a polymer obtained by polymerizing the styrene component. The shell layer may contain a homopolymer of styrene, or may contain a copolymer of styrene and other monomers. Examples of the styrene component include components similar to the styrene component exemplified in the core layer. Examples of the other monomer include alkyl (meth) acrylates (e.g., methyl (meth) acrylate, ethyl (meth) acrylate, n-propyl (meth) acrylate, n-butyl (meth) acrylate, n-hexyl (meth) acrylate, 2-ethylhexyl (meth) acrylate, cyclohexyl (meth) acrylate, or octadecyl (meth) acrylate), and the like. In the alkyl (meth) acrylate, at least a part of hydrogen of the alkyl chain may be substituted. Examples of the substituent for hydrogen include amino, hydroxyl, halogen, or the like. One kind of alkyl (meth) acrylate may be used alone, or two or more kinds of alkyl (meth) acrylates may be used in combination. In addition, polyfunctional monomers such as allyl (meth) acrylate, triallyl isocyanurate, and divinylbenzene may be used as the other monomers. The styrene polymer contained in the shell layer is preferably a copolymer in which the content of the styrene component is 85 to 100 mass% and the content of the other monomer component (preferably, alkyl (meth) acrylate) is 0 to 15 mass%.

Among styrene polymers, the styrene polymer contained in the shell layer is preferably a copolymer of styrene and an alkyl (meth) acrylate in terms of preventing squeak noise in a resin molded article. From a similar viewpoint, a copolymer of styrene and an alkyl (meth) acrylate in which the alkyl chain has 1 to 8 carbon atoms is preferable, and a polymer of an alkyl (meth) acrylate in which the alkyl chain has 1 to 4 carbon atoms is more preferable.

The shell layer containing the acrylonitrile-styrene polymer comprises a copolymer of an acrylonitrile component and a styrene component. The acrylonitrile-styrene polymer is not particularly limited, and examples thereof include known acrylonitrile-styrene polymers. The acrylonitrile-styrene polymer may be, for example, a copolymer of 10 to 80 mass% of an acrylonitrile component and 20 to 90 mass% of a styrene component. Examples of the styrene component copolymerized with the acrylonitrile component include components similar to the styrene component exemplified in the core layer. In addition, polyfunctional monomers such as allyl (meth) acrylate, triallyl isocyanurate, and divinylbenzene may also be used for the acrylonitrile-styrene polymer contained in the shell layer.

The one or more further layers present between the core layer and the shell layer comprise layers comprising the polymers described in the shell layer.

The content of the polymer in the shell layer is preferably 1 to 40% by mass, more preferably 3 to 30% by mass, and still more preferably 5 to 15% by mass, based on the polymer having the core-shell structure as a whole.

Among the components (b1), examples of commercially available products of the polymer having a core-shell structure (b1) comprising a core layer containing a butadiene polymer and a shell layer containing a styrene polymer on the surface of the core layer include, for example, "METABLEN" (registered trademark) manufactured by mitsubishi chemical CORPORATION, "KANE ACE" (registered trademark) manufactured by KANEKA CORPORATION, "cleartree" (registered trademark) manufactured by ARKEMA, and "PARALOID" (registered trademark) manufactured by DOW chemicla pan.

In addition, among the component (b1), examples of commercially available products of the polymer having a core-shell structure (b1) including a core layer containing a butadiene polymer and a shell layer containing an acrylonitrile-styrene polymer on a surface of the core layer include "BLENDEX" (registered trademark) manufactured by GALATA CHEMICALS or "ELIX" manufactured by ELIX POLYMERS, and the like.

The average primary particle diameter of the polymer having a core-shell structure (b1) is not particularly limited, but is preferably 50nm to 500nm, more preferably 50nm to 400nm, still more preferably 100nm to 300nm, and particularly preferably 150nm to 250nm in terms of preventing squeak noise in a resin molded article.

The average primary particle diameter refers to a value measured by the following method. The average primary particle size is obtained by the following method: observing the particles with a scanning electron microscope; setting the maximum diameter of the primary particles as a primary particle diameter; and the primary particle diameters of 100 particles were measured, and the total value of the primary particle diameters was averaged. Specifically, the average primary particle diameter is determined by observing the dispersion form of the polymer having a core-shell structure in the resin composition with a scanning electron microscope.

(styrene-ethylene-butadiene-styrene copolymer (b 2): component (b2))

The copolymer (b2) is not particularly limited as long as the copolymer (b2) is a thermoplastic elastomer, and examples thereof include known styrene-ethylene-butadiene-styrene copolymers. The copolymer (b2) may be a styrene-ethylene-butadiene-styrene copolymer and a hydrogenated product thereof.

The copolymer (b2) is preferably a hydrogenated product of a styrene-ethylene-butadiene-styrene copolymer in terms of preventing squeak noise in a resin molded article. From a similar viewpoint, the copolymer (b2) may be a block copolymer, for example, a copolymer (styrene-ethylene/butylene-styrene triblock copolymer) preferably comprising a block having a styrene moiety at both terminals and a central block having an ethylene/butylene moiety, which is obtained by hydrogenating at least a part of the double bonds of a butadiene moiety. The ethylene/butylene block portion of the styrene-ethylene/butylene-styrene copolymer may be a random copolymer.

The copolymer (b2) can be obtained by a known method. In the case where the copolymer (b2) is a hydrogenated product of a styrene-ethylene-butadiene-styrene copolymer, for example, the copolymer (b2) can be obtained by hydrogenating the butadiene moiety of a styrene-butadiene-styrene block copolymer, in which the conjugated diene moiety is composed of 1,4 bonds.

Examples of commercially available products of the copolymer (b2) include "KRATON" (registered trademark) manufactured by CLAYTON co., ltd., or "SEPTON" (registered trademark) manufactured by Kuraray co., ltd., and the like.

(polyurethane (b 3): component (b3))

The polyurethane (b3) is not particularly limited as long as the polyurethane (b3) is a thermoplastic elastomer, and examples thereof include known polyurethanes. The polyurethane (b3) is preferably a linear polyurethane. The polyurethane (b3) is obtained, for example, by reacting a polyol component (polyether polyol, polyester polyol, polycarbonate polyol, or the like) with an organic isocyanate component (aromatic diisocyanate, aliphatic (including alicyclic) diisocyanate, or the like) and, if necessary, with a chain extender (aliphatic (including alicyclic) diol, or the like). One kind of the polyol component and the organic isocyanate component may be used alone, or two or more kinds of the polyol component and two or more kinds of the organic isocyanate component may be used in combination, respectively.

The polyurethane (b3) is preferably an aliphatic polyurethane in terms of preventing squeak noise in the resin molded article. The aliphatic polyurethane is preferably obtained by, for example, reacting a polyol component containing a polycarbonate polyol with an isocyanate component containing an aliphatic diisocyanate.

For example, the polyol component may be reacted with the organic isocyanate component to obtain the polyurethane (b3) by making the NCO/OH ratio of the raw materials in synthesizing the polyurethane fall within the range of 0.90 to 1.5. The polyurethane (b3) can be obtained by known methods such as a one-shot method and a pre-polymerization method.

Examples of commercially available products of the polyurethane (b3) include "ESTANE" (registered trademark) manufactured by LUBRIZOL CORPORATION or "ELASTOLLAN" (registered trademark) manufactured by BASF, and the like. Mention may also be made of "DESMOPAN" (registered trademark) manufactured by BAYER CORPORATION.

(aromatic polyester (b 4): component (b4))

The aromatic polyester (b4) is not particularly limited as long as the aromatic polyester (b4) is a thermoplastic elastomer, and examples thereof include known polyesters. In an exemplary embodiment, the aromatic polyester means a polyester having an aromatic ring in its structure.

Examples of the aromatic polyester (b4) include polyester copolymers (polyether ester, polyester ester or the like). Examples of the aromatic polyester (b4) specifically include: a polyester copolymer having a hard segment formed of a polyester unit and a soft segment formed of a polyester unit; a polyester copolymer having a hard segment formed of polyester units and a soft segment formed of polyether units; and a polyester copolymer having a hard segment formed of polyester units and a soft segment formed of polyether units and polyester units. The mass ratio of the hard segment to the soft segment (hard segment/soft segment) of the polyester copolymer is, for example, preferably 20/80 to 80/20. The polyester unit constituting the hard segment and the polyester unit and polyether unit constituting the soft segment may be of an aromatic series or an aliphatic series (including an alicyclic series).

The polyester copolymer as the aromatic polyester (b4) can be obtained by a known method. The polyester copolymer is preferably linear. The polyester copolymer can be obtained by: a method of esterifying or transesterifying a dicarboxylic acid component having 4 to 20 carbon atoms, a diol component having 2 to 20 carbon atoms, and a polyalkylene glycol component (alkylene oxide adduct containing polyalkylene glycol) having a number-average molecular weight of 300 to 20,000; and a method of polycondensing an oligomer obtained by esterifying or transesterifying these components. Further, for example, there can be mentioned a method of esterifying or transesterifying a dicarboxylic acid component having 4 to 20 carbon atoms, a diol component having 2 to 20 carbon atoms and an aliphatic polyester component having a number average molecular weight of 300 to 20,000. The dicarboxylic acid component is an aromatic or aliphatic dicarboxylic acid or an ester derivative thereof. The diol component is an aromatic or aliphatic diol. The polyalkylene glycol component is an aromatic or aliphatic polyalkylene glycol.

Among these components, it is preferable to use a dicarboxylic acid component having an aromatic ring as the dicarboxylic acid component of the polyester copolymer in terms of preventing squeak noise in the resin molded product. Further, the aliphatic diol component and the aliphatic polyalkylene glycol component are preferably used as the diol component and the polyalkylene glycol component, respectively.

Examples of commercially available products of the aromatic polyester (b4) include "perfrene" (registered trademark) manufactured by TOYOBO co., ltd., and "HYTREL" (registered trademark) manufactured by DU PONT-torch co., ltd.

[ plasticizer (C): component (C) ]

Examples of the plasticizer (C) include cardanol compounds, ester compounds, camphor, metal soaps, polyhydric alcohols, polyalkylene oxides, or the like. In exemplary embodiments, the ester compound (E1) represented by a specific general formula shown below as "other component (E)" is excluded from the ester compound as the plasticizer (C).

One kind of plasticizer (C) may be used alone, or two or more kinds of plasticizers (C) may be used in combination.

The plasticizer (C) is preferably at least one selected from the cardanol compound and an ester compound other than the other component (E) from the viewpoint of preventing squeak noise in the resin molded article. Cardanol compounds and ester compounds suitable as the plasticizer (C) will be specifically described below.

-anacardol compounds

The cardanol compound refers to a component contained in a natural derivative compound derived from a cashew nut (for example, a compound represented by the following structural formulae (c-1) to (c-4)) or a derivative derived from the above component.

One cardanol compound may be used alone, or two or more cardanol compounds may be used in combination.

The resin composition of the exemplary embodiment may contain a mixture of compounds derived from natural sources of cashew nuts (referred to as "cashew-derived mixture") as the cardanol compound.

The resin composition of the exemplary embodiment may contain a derivative from a mixture of cashew sources as a cardanol compound. Examples of derivatives from mixtures of cashew sources include the following mixtures or pure substances, and the like.

A mixture obtained by adjusting the composition ratio of each component in the cashew nut-derived mixture;

pure substances obtained by separating only specific components from mixtures of cashew origin;

a mixture containing a modified product obtained by modifying a component in the mixture derived from cashew nuts;

a mixture containing a polymer obtained by polymerizing components in the cashew nut-derived mixture;

a mixture containing a modified polymer obtained by modifying and polymerizing components in the cashew nut-derived mixture;

a mixture containing a modified product obtained by further modifying the components in the mixture in which the composition ratio is adjusted;

a mixture containing a modified product obtained by further polymerizing the components in the mixture in which the composition ratio is adjusted;

a mixture containing a modified polymer obtained by further modifying and polymerizing the components in the mixture in which the composition ratio is adjusted;

modified products obtained by further modification of the isolated pure substances;

polymers obtained by further polymerizing the isolated pure substances;

modified polymers obtained by further modification and polymerization of the isolated pure substances.

Here, pure substances include multimers, such as dimers and trimers.

From the viewpoint of preventing squeak noise in the resin molded article, the cardanol compound is preferably at least one compound selected from the group consisting of a compound represented by general formula (CDN1) and a polymer obtained by polymerizing a compound represented by general formula (CDN 1).

In the general formula (CD)N1), R¹Represents an alkyl group which may have a substituent, or an unsaturated aliphatic group which may have a double bond and may have a substituent. R²Represents a hydroxyl group, a carboxyl group, an alkyl group which may have a substituent, or an unsaturated aliphatic group which may have a double bond and may have a substituent. P2 represents an integer of 0 to 4. When P2 is 2 or more, plural Rs²May be the same group or different groups.

In the general formula (CDN1), R is represented by¹The alkyl group which may have a substituent(s) represented is preferably an alkyl group having 3 to 30 carbon atoms, more preferably an alkyl group having 5 to 25 carbon atoms, and still more preferably an alkyl group having 8 to 20 carbon atoms.

Examples of the substituent include: a hydroxyl group; ether bond-containing substituents such as epoxy and methoxy; and substituents containing ester bonds, such as acetyl and propionyl; and so on.

Examples of the alkyl group which may have a substituent include pentadecan-1-yl, heptane-1-yl, octane-1-yl, nonane-1-yl, decan-1-yl, undecane-1-yl, dodecane-1-yl or tetradecan-1-yl and the like.

In the general formula (CDN1), R is represented by¹The unsaturated aliphatic group having a double bond and which may have a substituent represented is preferably an unsaturated aliphatic group having 3 to 30 carbon atoms, more preferably an unsaturated aliphatic group having 5 to 25 carbon atoms, and still more preferably an unsaturated aliphatic group having 8 to 20 carbon atoms.

The number of double bonds contained in the unsaturated aliphatic group is preferably 1 to 3.

Examples of the substituent of the unsaturated aliphatic group are similar to those of the substituent of the alkyl group.

Examples of the unsaturated aliphatic group which has a double bond and may have a substituent include pentadec-8-en-1-yl, pentadec-8, 11-dien-1-yl, pentadec-8, 11, 14-trien-1-yl, pentadec-7-en-1-yl, pentadec-7, 10-dien-1-yl or pentadec-7, 10, 14-trien-1-yl and the like.

In the general formula (CDN1), R¹Preferably pentadec-8-en-1-yl, pentadec-8, 11-dien-1-yl, pentadec-8, 11,14-trien-1-yl, pentadec-7-en-1-yl, pentadec-7, 10-dien-1-yl or pentadec-7, 10, 14-trien-1-yl and the like.

In the general formula (CDN1), R²(which represents an alkyl group which may have a substituent, and an unsaturated aliphatic group which may have a double bond and may have a substituent) with R¹(which represents an alkyl group which may have a substituent, and an unsaturated aliphatic group which may have a double bond and may have a substituent) are described as preferable examples similarly.

The compound represented by the general formula (CDN1) may be further modified. For example, compounds represented by CDN1 may be epoxidized. Specifically, the epoxidation product may be a compound having a structure in which a hydroxyl group of the compound represented by the general formula (CDN1) is substituted with the following group (EP), that is, a compound represented by the following general formula (CDN 1-e).

In the group (EP) and the formula (CDN1-e), L_EPRepresents a single bond or a divalent linking group. R in the general formula (CDN1-e)¹、R²And P2 are as defined for R in formula (CDN1)¹、R²As defined for P2.

In the group (EP) and the general formula (CDN1-e), from L_EPExamples of the divalent linking group represented include an alkylene group (preferably an alkylene group having 1 to 4 carbon atoms, more preferably an alkylene group having 1 carbon atom) or-CH which may have a substituent₂CH₂OCH₂CH₂-and the like.

Examples of substituents are with R of formula (CDN1)¹The substituents in (1) are as described.

L_EPMethylene is preferred.

The polymer obtained by polymerizing the compound represented by the general formula (CDN1) refers to a polymer in which at least two compounds represented by the general formula (CDN1) are polymerized with or without a linking group.

Examples of the polymer obtained by polymerizing the compound represented by the general formula (CDN1) include a compound represented by the following general formula (CDN 2).

In the general formula (CDN2), R¹¹、R¹²And R¹³Each independently represents an alkyl group which may have a substituent, or an unsaturated aliphatic group which has a double bond and may have a substituent. R²¹、R²²And R²³Each independently represents a hydroxyl group, a carboxyl group, an alkyl group which may have a substituent, or an unsaturated aliphatic group which may have a double bond and may have a substituent. P21 and P23 each independently represent an integer of 0 to 3, and P22 represents an integer of 0 to 2. L is¹And L²Each independently represents a divalent linking group. n represents an integer of 0 to 10. Plural R's when P21 is 2 or more²¹And a plurality of R's when P22 is 2 or more²²And a plurality of R when P23 is 2 or more²³May be the same group or different groups, respectively. When n is 2 or more, a plurality of R¹²、R²²And L¹May be the same group or different groups, respectively. The plurality of P22 in the case where n is 2 or more may be the same number or different numbers.

In the general formula (CDN2) R¹¹、R¹²、R¹³、R²¹、R²²And R²³(they represent an alkyl group which may have a substituent and an unsaturated aliphatic group which may have a double bond) and a preferable example thereof is represented by R in the general formula (CDN1)¹The preferred embodiment described above is similar.

In the general formula (CDN2) represented by L¹And L²Examples of the divalent linking group represented include an alkylene group which may have a substituent (preferably an alkylene group having 2 to 30 carbon atoms, more preferably an alkylene group having 5 to 20 carbon atoms) and the like.

Examples of substituents are with R of formula (CDN1)¹The examples described for the substituents in (1) are similar.

In the general formula (CDN2), n is preferably 1 to 10, and more preferably 1 to 5.

The compound represented by the general formula (CDN2) may be further modified. For example, compounds represented by CDN2 may be epoxidized. Specifically, the epoxidation product may be a compound having a structure in which a hydroxyl group of the compound represented by the general formula (CDN2) is substituted with the following group (EP), that is, a compound represented by the following general formula (CDN 2-e).

R in the general formula (CDN2-e)¹¹、R¹²、R¹³、R²¹、R²²、R²³、P21、P22、P23、L¹、L²And n are each as defined for R in formula (CDN2)¹¹、R¹²、R¹³、R²¹、R²²、R²³、P21、P22、P23、L¹、L²And n are as defined.

In the general formula (CDN2-e), L_EP1、L_EP2And L_EP3Each independently represents a single bond or a divalent linking group. When n is 2 or more, a plurality of L_EP2May be the same group or different groups.

General formula (CDN2-e) represented by L_EP1、L_EP2And L_EP3Preferred examples of the divalent linking group represented by the formula (CDN1-e) represented by L_EPThe preferred examples described for the divalent linking groups represented are similar.

The polymer obtained by polymerizing the compound represented by the general formula (CDN1) may be, for example, a polymer obtained by three-dimensionally crosslinking and polymerizing at least three or more compounds represented by the general formula (CDN1) with or without a linking group. Examples of the polymer obtained by three-dimensionally crosslinking and polymerizing the compound represented by the general formula (CDN1) include, for example, a compound represented by the following structural formula.

In the above structural formula R¹⁰、R²⁰And P20 are as defined for R in formula (CDN1)¹、R²As defined for P2. L is¹⁰Represents a single bond or a divalent linking group. Plural R¹⁰、R²⁰And L¹⁰May be the same group or different groups, respectively. The plurality of P20 may be the same number or different numbers.

In the structural formula, the¹⁰Examples of the divalent linking group represented include an alkylene group which may have a substituent (preferably an alkylene group having 2 to 30 carbon atoms, more preferably an alkylene group having 5 to 20 carbon atoms) and the like.

Examples of substituents are with R of formula (CDN1)¹The examples described for the substituents in (1) are similar.

The compound represented by the above structural formula may be further modified and, for example, may be epoxidized. Specifically, the epoxidation product may be a compound having a structure in which a hydroxyl group of the compound represented by the structural formula is substituted with a group (EP), for example, a compound represented by the following structural formula, that is, a polymer obtained by three-dimensionally crosslinking and polymerizing a compound represented by the general formula (CDN 1-e).

In the above structural formula R¹⁰、R²⁰And P20 are as defined for R in formula (CDN1-e), respectively¹、R²As defined for P2. L is¹⁰Represents a single bond or a divalent linking group. Plural R¹⁰、R²⁰And L¹⁰May be the same group or different groups, respectively. The plurality of P20 may be the same number or different numbers.

In the structural formula, the¹⁰Examples of the divalent linking group represented include an alkylene group which may have a substituent (preferably an alkylene group having 2 to 30 carbon atoms, more preferably an alkylene group having 5 to 20 carbon atoms) and the like.

Examples of substituents are with R of formula (CDN1)¹The examples described for the substituents in (1) are similar.

The cardanol compound preferably contains a cardanol compound having an epoxy group, and more preferably a cardanol compound having an epoxy group, from the viewpoint of preventing squeak noise in the resin molded product.

As the cardanol compound, a commercially available product can be used. Examples of commercially available products include NX-2024, Ultra LITE 2023, NX-2026, GX-2503, NC-510, LITE 2020, NX-9001, NX-9004, NX-9007, NX-9008, NX-9201, NX-9203, or the CARBOLITE CORP. manufactured by TOHOKU CHEMICAL INDUSTRIES, LTD., LB-7000, LB-7250, CD-5L, and the like, manufactured by CARDOLITE CORP.

Examples of commercially available products of cardanol compounds with epoxy groups include NC-513, NC-514S, NC-547, LITE513E, or Ultra LTE 513, manufactured by CARDOLITE CORP.

The hydroxyl value of the cardanol compound (D) is preferably 100mgKOH/g or more, more preferably 120mgKOH/g or more, and still more preferably 150mgKOH/g or more, from the viewpoint of preventing squeak noise in a resin molded product. The hydroxyl value of the cardanol compound was measured according to method a of ISO 14900.

In the case where a cardanol compound having an epoxy group is used as the cardanol compound, the epoxy equivalent of the cardanol compound is preferably 300 to 500, more preferably 350 to 480, and still more preferably 400 to 470 in terms of preventing squeak noise in the resin molded product. The epoxy equivalent of the cardanol compound having an epoxy group is measured according to ISO 3001.

The molecular weight of the cardanol compound is preferably 250 to 1000, more preferably 280 to 900, and still more preferably 300 to 800 in terms of preventing squeak noise in the resin molded article.

Ester compounds

The ester compound contained as the plasticizer (C) in the resin composition of the exemplary embodiment is not particularly limited as long as the ester compound is an ester compound other than the compounds represented by the following general formulae (1) to (5).

Examples of the ester compound contained as the plasticizer (C) include dicarboxylic acid diesters, citric acid esters, polyether ester compounds, benzoic acid glycol esters, compounds represented by the following general formula (6), epoxidized fatty acid esters, and the like. Examples of such esters include monoesters, diesters, triesters, or polyesters, and the like.

In the general formula (6), R⁶¹Represents an aliphatic hydrocarbon group having 7 to 28 carbon atoms, R⁶²Represents an aliphatic hydrocarbon group having 1 to 8 carbon atoms.

From R⁶¹Specific forms and preferred forms of the group represented and the group represented by the formula (1) represented by R¹¹The specific and preferred forms of the groups shown are similar.

From R⁶²The group represented may be a saturated aliphatic hydrocarbon group, or an unsaturated aliphatic hydrocarbon group, and is preferably a saturated aliphatic hydrocarbon group. From R⁶²The group represented may be a straight-chain aliphatic hydrocarbon group, a branched-chain aliphatic hydrocarbon group or an aliphatic hydrocarbon group containing an alicyclic group, and is preferably a branched-chain aliphatic hydrocarbon group. From R⁶²The group represented may be a group obtained by substituting a hydrogen atom in an aliphatic hydrocarbon group with a halogen atom (e.g., a fluorine atom, a bromine atom, and an iodine atom), an oxygen atom, a nitrogen atom, or the like, and is preferably an aliphatic hydrocarbon group in which a hydrogen atom is unsubstituted. From R⁶²The group represented preferably has 2 or more carbon atoms, more preferably 3 or more carbon atoms, and still more preferably 4 or more carbon atoms.

Specific examples of the ester compound contained as the plasticizer (C) include adipates, citrates, sebacates, azelates, phthalates, acetates, dibasic esters, phosphates, condensed phosphates, glycol esters (e.g., ethylene benzoate), modified products of fatty acid esters (e.g., epoxidized fatty acid esters), and the like. Examples of esters include monoesters, diesters, triesters, polyesters, and the like. Among these esters, dicarboxylic acid diesters (such as adipic acid diester, sebacic acid diester, azelaic acid diester, and phthalic acid diester) are preferable.

The molecular weight (or weight average molecular weight) of the ester compound contained as the plasticizer (C) in the resin composition of the exemplary embodiment is preferably 200 to 2,000, more preferably 250 to 1,500, and still more preferably 280 to 1,000. The weight average molecular weight of the ester compound is a value measured according to the method for measuring the weight average molecular weight of the cellulose acylate (a), unless otherwise specified.

The plasticizer (C) is preferably an adipate. Since the adipic acid ester has high affinity with the cellulose acylate (a) and is dispersed in a substantially uniform state with respect to the cellulose acylate (a), the thermal fluidity of the adipic acid ester is further improved as compared with the other plasticizer (C).

Examples of adipic acid esters include adipic acid diesters and adipic acid polyesters. Specific examples include adipic diesters represented by the following general formula (AE) and adipic polyesters represented by the following general formula (APE).

[ solution 11]

In the general formula (AE), R^AE1And R^AE2Each independently represents an alkyl group or a polyoxyalkyl group [ - (C)_xH_2x-O)_y-R^A1](Here, R is^A1Represents an alkyl group, x represents an integer of 1 to 10, and y represents an integer of 1 to 10).

In the general formula (APE), R^AE1And R^AE2Each independently represents an alkyl group or a polyoxyalkyl group [ - (C)_xH_2x-O)_y-R^A1](Here, R is^A1Represents an alkyl group, x represents an integer of 1 to 10, y represents an integer of 1 to 10), and R^AE3Represents an alkylene group. m1 represents an integer of 1 to 10, and m2 represents an integer of 1 to 20.

In the general formulae (AE) and (APE), R is^AE1And R^AE2The alkyl group represented is preferably an alkyl group having 1 to 12 carbon atoms, more preferably an alkyl group having 4 to 10 carbon atoms, and still more preferably an alkyl group having 8 carbon atoms. From R^AE1And R^AE2The alkyl groups represented may be linear, branched or cyclic, and are preferably linear or branched.

R in the general formulae (AE) and (APE)^AE1And R^AE2Poly oxy of the formulaAlkyl [ - (C)_xH_2x-O)_y-R^A1]In the formula (II) is represented by R^A1The alkyl group represented is preferably an alkyl group having 1 to 6 carbon atoms, more preferably an alkyl group having 1 to 4 carbon atoms. From R^A1The alkyl groups represented may be linear, branched or cyclic, and are preferably linear or branched.

In the general formula (APE), from R^AE3The alkylene group represented is preferably an alkylene group having 1 to 6 carbon atoms, more preferably an alkylene group having 1 to 4 carbon atoms. The alkylene group may be linear, branched or cyclic, and is preferably linear or branched.

In the general formula (APE), m1 is preferably an integer of 1 to 5, and m2 is preferably an integer of 1 to 10.

In the general formulae (AE) and (APE), the group represented by each symbol may be substituted with a substituent. Examples of the substituent include an alkyl group, an aryl group, a hydroxyl group, or the like.

The molecular weight (or weight average molecular weight) of the adipate is preferably 250 to 2,000, more preferably 280 to 1,500, still more preferably 300 to 1,000. The weight average molecular weight of adipate is a value measured according to the method of measuring the weight average molecular weight of cellulose acylate (a).

Mixtures of adipates with other components may be used as the adipate. Examples of commercially available products of the mixture include daicatty 101 manufactured by DAIHACHI CHEMICAL input co.

The hydrocarbon group at the end of the fatty acid ester (e.g., citrate ester, sebacate ester, azelate ester, phthalate ester, and acetate ester) is preferably an aliphatic hydrocarbon group, and is preferably an alkyl group having 1 to 12 carbon atoms, more preferably an alkyl group having 4 to 10 carbon atoms, and still more preferably an alkyl group having 8 carbon atoms. The alkyl group may be linear, branched or cyclic, and is preferably linear or branched.

Examples of fatty acid esters (e.g., citrate, sebacate, azelate, phthalate, and acetate) include esters formed from fatty acids and alcohols. Examples of the alcohol include: monohydric alcohols such as methanol, ethanol, propanol, butanol and 2-ethylhexanol; and polyhydric alcohols such as glycerin, polyglycerin (diglycerin, etc.), pentaerythritol, ethylene glycol, diethylene glycol, propylene glycol, butylene glycol, trimethylolpropane, trimethylolethane, and sugar alcohols; and so on.

Examples of diols in the glycol benzoate include ethylene glycol, diethylene glycol, or propylene glycol, and the like.

The epoxidized fatty acid ester is an ester compound (i.e., oxetane) having a structure in which the carbon-carbon unsaturated bond of the unsaturated fatty acid ester is epoxidized. Examples of epoxidized fatty acid esters include esters formed from alcohols and fatty acids in which some or all of the carbon-carbon unsaturation of an unsaturated fatty acid (e.g., oleic, palmitoleic, vaccenic, linoleic, linolenic, or nervonic acid, etc.) is epoxidized. Examples of the alcohol include: monohydric alcohols such as methanol, ethanol, propanol, butanol and 2-ethylhexanol; polyhydric alcohols such as glycerin, polyglycerin (diglycerin and the like), pentaerythritol, ethylene glycol, diethylene glycol, propylene glycol, butylene glycol, trimethylolpropane, trimethylolethane, sugar alcohols, and the like; and so on.

Examples of commercially available products of epoxidized fatty acid esters include ADK CIZER D-32, D-55, O-130P and O-180A (manufactured by ADEKA), and SANSOSAIZA E-PS, nE-PS, E-PO, E-4030, E-6000, E-2000H and E-9000H (manufactured by NEW JAPAN CHEMICAL CO., LTD.).

Each of the polyester unit and the polyether unit in the polyether ester compound may be of an aromatic series or an aliphatic series (containing an alicyclic series). The mass ratio of the polyester unit to the polyether unit is, for example, 20:80 to 80: 20. The molecular weight (or weight average molecular weight) of the polyetherester compound is preferably 250 to 2,000, more preferably 280 to 1,500, and still more preferably 300 to 1,000. Examples of commercially available products of polyetherester compounds include ADK CIZER RS-1000 (ADEKA).

Examples of the polyether ester compound having 1 or more unsaturated bonds in its molecule are polyether ester compounds having allyl groups at its terminals, which are preferably polyalkylene glycol allyl ethers. The molecular weight (or weight average molecular weight) of the polyetherester compound having 1 or more unsaturated bonds in the molecule thereof is preferably 250 to 2,000, more preferably 280 to 1,500, and further preferably 300 to 1,000. Examples of commercially available products of polyether ester compounds having 1 or more unsaturated bonds in the molecule thereof include polyalkylene glycol allyl ethers such as UNIOX PKA-5006, UNIOX PKA-5008, UNIOL PKA-5014, UNIOLPKA-5017(NOF CORPORATION).

(aliphatic polyester (D): component (D))

The aliphatic polyester (D) is, for example, a polymer of hydroxyalkanoate (hydroxyalkanoic acid), a polycondensate of a polycarboxylic acid and a polyhydric alcohol, a ring-opening polycondensate of a cyclic lactam, or the like.

Examples of the aliphatic polyester resin (D) include polyhydroxyalkanoate (polymer of hydroxyalkanoate), a polycondensate of aliphatic diol and aliphatic carboxylic acid, and the like.

In the case of the aliphatic polyester resin (D), it is preferable to use polyhydroxyalkanoate as the aliphatic polyester resin (D) in terms of preventing squeak noise in the resin molded article.

One kind of the aliphatic polyester resin (D) may be used alone, and two or more kinds of the aliphatic polyester resins (D) may be used in combination.

Examples of the polyhydroxyalkanoate include a compound having a structural unit represented by the general formula (PHA).

In the compound having a structural unit represented by the general formula (PHA), both ends of the polymer chain (ends of the main chain) may be carboxyl groups. Alternatively, only one end is a carboxyl group and the other end may be another group (e.g., a hydroxyl group).

R in the general formula (PHA)^PHA1Represents an alkylene group having 1 to 10 carbon atoms. n represents an integer of 2 or more.

In the general formula (PHA) by R^PHA1The alkylene group represented is preferably an alkylene group having 3 to 6 carbon atoms. From R^PHA1The alkylene groups represented may be linear or branched, and are preferably branched.

Here, in the general formula (PHA) R^PHA1The expression "alkylene" means 1) when R is^PHA1When they represent the same alkylene group, [ O-R ]^PHA1-C(＝O)-]The structure is contained in a PHA; 2) when R is^PHA1When they represent alkylene groups having different numbers of carbon atoms or different branches, a plurality of [ O-R ]^PHA1-C(＝O)-]Structure (i.e., [ O-R ]^PHA1A-C(＝O)-]And [ O-R^PHA1B-C(＝O)-]Structure) is contained in the PHA.

That is, the polyhydroxyalkanoate may be a homopolymer of one kind of polyhydroxyalkanoate (hydroxyalkanoic acid), or may be a copolymer of two or more kinds of polyhydroxyalkanoate (hydroxyalkanoic acid).

In the general formula (PHA), the upper limit of n is not particularly limited, and examples thereof include 20,000 or less. n preferably ranges from 500 to 10,000, more preferably from 1,000 to 8,000.

Examples of the polyhydroxyalkanoate include homopolymers of hydroxyalkanoic acids (e.g., lactic acid, 2-hydroxybutyric acid, 3-hydroxybutyric acid, 4-hydroxybutyric acid, 2-hydroxy-3-methylbutyric acid, 2-hydroxy-3, 3-dimethylbutyric acid, 3-hydroxyvaleric acid, 4-hydroxyvaleric acid, 5-hydroxyvaleric acid, 3-hydroxyhexanoic acid, 2-hydroxyisocaproic acid, 6-hydroxyhexanoic acid, 3-hydroxypropionic acid, 3-hydroxy-2, 2-dimethylpropionic acid, 3-hydroxyhexanoic acid, and 2-hydroxy-n-octanoic acid), or copolymers of these 2 or more hydroxyalkanoic acids.

Among these examples of the polyhydroxyalkanoate, the polyhydroxyalkanoate may preferably be a homopolymer of a branched hydroxyalkanoic acid having 2 to 4 carbon atoms or a homopolymer of a branched hydroxyalkanoic acid having 2 to 4 carbon atoms and a branched hydroxyalkanoic acid having 5 to 7 carbon atoms, more preferably a homopolymer of a branched hydroxyalkanoic acid having 3 carbon atoms (i.e., polylactic acid) or a homopolymer of 3-hydroxybutyric acid and 3-hydroxyhexanoic acid (i.e., polyhydroxybutyrate hexanoate), and still more preferably a homopolymer of a branched hydroxyalkanoic acid having 3 carbon atoms (i.e., polylactic acid), in terms of preventing squeak noise in a resin molded article.

The number of carbon atoms of hydroxyalkanoic acids also includes the number of carbon atoms of carboxyl groups.

Polylactic acid is a polymer compound in which lactic acid is polymerized through an ester bond.

Examples of the polylactic acid include homopolymers of L-lactic acid, homopolymers of D-lactic acid, block copolymers of polymers containing at least one of L-lactic acid and D-lactic acid, and graft copolymers of polymers containing at least one of L-lactic acid and D-lactic acid.

Examples of the "compound copolymerizable with L-lactic acid or D-lactic acid" include polycarboxylic acids and anhydrides thereof, such as glycolic acid, dimethylglycolic acid, 3-hydroxybutyric acid, 4-hydroxybutyric acid, 2-hydroxypropionic acid, 3-hydroxypropionic acid, 2-hydroxyvaleric acid, 3-hydroxyvaleric acid, 4-hydroxyvaleric acid, oxalic acid, malonic acid, succinic acid, glutaric acid, adipic acid, pimelic acid, azelaic acid, sebacic acid, undecanedioic acid, dodecanedioic acid and terephthalic acid, polyols, such as ethylene glycol, diethylene glycol, triethylene glycol, 1, 2-propanediol, 1, 3-butanediol, 1, 4-butanediol, 2, 3-butanediol, 1, 5-pentanediol, 1, 6-hexanediol, 1, 9-nonanediol, 3-methyl-1, 5-pentanediol, neopentyl glycol, tetramethylenediol and 1, 4-hexanedimethanol, polysaccharides, such as cellulose, aminocarboxylic acids, such as α -amino acids, hydroxycarboxylic acids, such as 5-hydroxymandelic acid, 2-hydroxyhexanoic acid, 3-hydroxyhexanoic acid, 4-hydroxyhexanoic acid, 5-hydroxyvalerolactone, delta-6-hydroxycaprolactone, and the like, β, and the like.

It is known that polylactic acid can be prepared by the following method: lactide processes using lactide; a direct polymerization method in which lactic acid is heated in a solvent under reduced pressure and polymerized while removing water; and so on.

In the polyhydroxyhexanoate ester, the copolymerization ratio of 3-hydroxyhexanoic acid (3-hydroxyhexanoate ester) to the copolymer of 3-hydroxybutyric acid (3-hydroxybutyrate) and 3-hydroxyhexanoic acid (3-hydroxyhexanoate ester) is preferably 3 to 20 mol%, more preferably 4 to 15 mol%, and further preferably 5 to 12 mol%, from the viewpoint of preventing squeak noise in a resin molded article.

In the method of measuring the copolymerization ratio of 3-hydroxyhexanoic acid (3-hydroxyhexanoate) to a copolymer of 3-hydroxybutyric acid (3-hydroxybutyrate) and 3-hydroxyhexanoic acid, the hexanoate ratio was used¹H-NMR from the ends derived from caproate and butyric acidIntegral value of peak at ester end was calculated.

The weight average molecular weight (Mw) of the aliphatic polyester resin (D) is preferably 10,000 to 1,000,000 (preferably 50,000 to 800,000, more preferably 100,000 to 600,000) in terms of preventing squeak noise in the resin molded article.

The weight average molecular weight (Mw) of the aliphatic polyester resin (D) is a value measured by Gel Permeation Chromatography (GPC). Specifically, the molecular weight measurement by GPC was performed by HLC-8320GPC manufactured by TOSOH CORPORATION serving as an assay device, using column/TSK gel GMHHR-M + TSK gel GMHHR-M (7.8mm I.D.30cm) manufactured by TOSOH CORPORATION and chloroform solvent. The weight average molecular weight (Mw) was calculated from the measurement result by using a molecular weight calibration curve prepared from monodisperse polystyrene standard samples.

[ Heat distortion temperature of resin composition ]

A resin molded article obtained by molding the resin composition of the exemplary embodiment satisfies at least one of the following conditions (1) and (2): (1) a heat distortion temperature of 95 ℃ or less as measured according to ASTM D648-07B; and (2) a heat distortion temperature of 80 ℃ or less as measured according to ISO75-2A method (2013). In terms of preventing squeak noise in the resin molded article, the resin molded article preferably satisfies at least one of the following conditions: a heat distortion temperature under the condition (1) is 90 ℃ or less, and a heat distortion temperature under the condition (2) is 85 ℃ or less. Further, the resin molded article preferably satisfies at least one of the following conditions: a heat distortion temperature under the condition (1) is 85 ℃ or less, and a heat distortion temperature under the condition (2) is 75 ℃ or less.

[ contents or content ratios of Components (A) to (D) ]

The resin composition of the exemplary embodiment includes component (a), component (B), and component (C), and contains component (D) as necessary. In terms of preventing squeak noise in the resin molded article, the content or content ratio (both by mass) of each component in the resin composition of the exemplary embodiment is preferably within the following range.

Abbreviations for the respective components are as follows.

Component (A) ═ cellulose acylate (A)

Component (B) ═ polymer (B)

Component (C) is plasticizer (C)

Component (D) ═ aliphatic polyester (D)

The content of the component (a) in the resin composition of the exemplary embodiment is preferably 50% by mass or more, more preferably 60% by mass or more, and still more preferably 70% by mass or more, based on the total mass of the resin composition.

The content of the component (B) in the resin composition of the exemplary embodiment is preferably 1 to 20 mass%, more preferably 3 to 15 mass%, and still more preferably 5 to 10 mass%, based on the total mass of the resin composition.

The content of the component (C) in the resin composition of the exemplary embodiment is preferably 1 to 25 mass%, more preferably 3 to 20 mass%, and still more preferably 5 to 15 mass%, based on the total mass of the resin composition.

The content of the component (D) in the resin composition of the exemplary embodiment is preferably 0 to 20 mass%, more preferably 3 to 15 mass%, and still more preferably 3 to 10 mass%, based on the total mass of the resin composition.

The content ratio of the component (B) to the component (a) ((B)/(a)) is preferably 0.025 to 0.3, more preferably 0.05 to 0.2, and still more preferably 0.07 to 0.15.

The content ratio of the component (C) to the component (a) ((C)/(a)) is preferably 0.02 to 0.3, more preferably 0.03 to 0.2, and still more preferably 0.05 to 0.1.

The content ratio of the component (D) to the component (a) ((D)/(a)) is preferably 0.025 to 0.3, more preferably 0.05 to 0.2, and still more preferably 0.05 to 0.15.

[ other component (E) ]

The resin composition of the exemplary embodiment may include other component (E) (component (E)). In the case where the resin composition contains the other component (E), the total content of all the other components (E) may be 15% by mass or less, and preferably 10% by mass or less, based on the total amount of the resin composition.

Examples of the other component (E) include: flame retardants, compatibilizers, oxidation inhibitors, stabilizers, antiblocking agents, light stabilizers, weather-resistant agents, colorants, pigments, modifiers, drip retardants, antistatic agents, hydrolysis inhibitors, fillers, reinforcing agents (glass fibers, carbon fibers, talc, clay, mica, glass flakes, ground glass, glass beads, crystalline silica, alumina, silicon nitride, aluminum nitride, boron nitride, etc.), acid acceptors for preventing acetic acid release (oxides such as magnesium oxide and alumina, metal hydroxides such as magnesium hydroxide, calcium hydroxide, aluminum hydroxide, and hydrotalcite; calcium carbonate; talc; etc.) and reactive trapping agents (such as epoxy compounds, acid anhydride compounds, and carbodiimides), and the like. The content of the other component is preferably 0 to 5 mass% based on the total mass of the resin composition. Here, "0 mass%" means that no other component is contained.

The resin composition of the exemplary embodiment may include other resins than the component (a), the component (B), the component (C), and the component (D) as the other component (E). However, in the case where other resin is contained, the content of the other resin is preferably 5% by mass or less, and more preferably less than 1% by mass, based on the total amount of the resin composition. More preferably, no other resin is contained (i.e., 0 mass%).

Examples of the other resins include generally known thermoplastic resins, and specific examples thereof include: a polycarbonate resin; a polypropylene resin; a polyester resin; a polyolefin resin; a polyester carbonate resin; polyphenylene ether resins; polyphenylene sulfide resin; polysulfone resin; polyether sulfone resin; a polyarylene resin; a polyetherimide resin; a polyacetal resin; a polyvinyl acetal resin; a polyketone resin; a polyetherketone resin; poly (ether ketone) resins; a polyaryl ketone resin; a polyether nitrile resin; a liquid crystal resin; a polybenzimidazole resin; a polyoxamide resin; a vinyl-based polymer or copolymer obtained by polymerizing or copolymerizing one or more vinyl monomers selected from the group consisting of an aromatic alkenyl compound, a methacrylate, an acrylate, and a vinyl cyanide compound; a diene-aromatic alkenyl compound copolymer; vinyl cyanide-diene-aromatic alkenyl compound copolymers; aromatic alkenyl compound-diene-vinyl cyanide-N-phenyl maleimide copolymer; vinyl cyanide- (ethylene-diene-propylene (EPDM)) -aromatic alkenyl compound copolymers; a thermoplastic elastomer containing an acryl-based polymer; a polyvinyl chloride resin; chlorinated vinyl chloride resin; and so on. These resins may be used alone or two or more thereof may be used in combination.

In addition, examples of the other components include ester compounds (e1) other than the ester compound used as the above plasticizer.

The ester compound (e1) other than the ester compound used as the plasticizer (C) is at least one selected from the group consisting of a compound represented by the following general formula (1), a compound represented by the following general formula (2), a compound represented by the following general formula (3), a compound represented by the following general formula (4), and a compound represented by the following general formula (5).

R in the general formula (1)¹¹Represents an aliphatic hydrocarbon group having 7 to 28 carbon atoms. R in the general formula (1)¹²Represents an aliphatic hydrocarbon group having 9 to 28 carbon atoms.

R in the general formula (2)²¹And R²²Each independently represents an aliphatic hydrocarbon group having 7 to 28 carbon atoms.

R in the general formula (3)³¹And R³²Each independently represents an aliphatic hydrocarbon group having 7 to 28 carbon atoms.

R in the general formula (4)⁴¹、R⁴²And R⁴³Each independently represents an aliphatic hydrocarbon group having 7 to 28 carbon atoms.

R in the general formula (5)⁵¹、R⁵²、R⁵³And R⁵⁴Each independently represents an aliphatic hydrocarbon group having 7 to 28 carbon atoms.

R¹¹Represents an aliphatic hydrocarbon group having 7 to 28 carbon atoms. Lubrication of molecular chains in which the groups easily act as a resin (particularly cellulose acylate (A), the same applies hereinafter)In the aspect of the agent, from R¹¹The group represented is preferably an aliphatic hydrocarbon group having 9 or more carbon atoms, more preferably an aliphatic hydrocarbon group having 10 or more carbon atoms, and still more preferably an aliphatic hydrocarbon group having 15 or more carbon atoms. In the case where groups are easily taken into the space between molecular chains of the resin (particularly, cellulose acylate (A), the same applies hereinafter), the group represented by R¹¹The group represented is preferably an aliphatic hydrocarbon group having 24 or less carbon atoms, more preferably an aliphatic hydrocarbon group having 20 or less carbon atoms, and still more preferably an aliphatic hydrocarbon group having 18 or less carbon atoms. From R¹¹The radicals indicated are particularly preferably aliphatic hydrocarbon radicals having 17 carbon atoms.

From R¹¹The group represented may be a saturated aliphatic hydrocarbon group, or an unsaturated aliphatic hydrocarbon group. From the point of easy group entry between molecular chains of the resin, from R¹¹The group represented is preferably a saturated aliphatic hydrocarbon group.

From R¹¹The group represented may be a straight chain aliphatic hydrocarbon group, a branched chain aliphatic hydrocarbon group or an aliphatic hydrocarbon group containing an alicyclic group. From the point of easy group entry between molecular chains of the resin, from R¹¹The group represented is preferably an aliphatic hydrocarbon group having an alicyclic group (i.e., a chain aliphatic hydrocarbon group), and more preferably a linear aliphatic hydrocarbon group.

In the reaction of R¹¹In the case where the group represented is an unsaturated aliphatic hydrocarbon group, the group preferably has 1 to 3 unsaturated bonds, more preferably 1 or 2 unsaturated bonds, and still more preferably 1 unsaturated bond, from the viewpoint that the group easily enters between molecular chains of the resin.

In the reaction of R¹¹In the case where the group represented is an unsaturated aliphatic hydrocarbon group, the group preferably has, in terms of the group easily entering between the molecular chains of the cellulose acylate (a) and easily serving as a lubricant for the molecular chains of the cellulose acylate (a): a straight saturated hydrocarbon chain having 5 to 24 carbon atoms, more preferably a straight saturated hydrocarbon chain having 7 to 22 carbon atoms, still more preferably a straight saturated hydrocarbon chain having 9 to 20 carbon atoms, and particularly preferably a straight saturated hydrocarbon chain having 15 to 18 carbon atoms.

In the reaction of R¹¹In the case where the group represented is a branched aliphatic hydrocarbon group, the group preferably has 1 to 3 branches, more preferably 1 or 2 branches, and still more preferably 1 branch, from the viewpoint that the group easily enters between molecular chains of the resin.

In the reaction of R¹¹In the case where the group represented is a branched aliphatic hydrocarbon group, the main chain in the group is preferably a straight saturated hydrocarbon chain having 5 to 24 carbon atoms, more preferably a straight saturated hydrocarbon chain having 7 to 22 carbon atoms, still more preferably a straight saturated hydrocarbon chain having 9 to 20 carbon atoms, particularly preferably a straight saturated hydrocarbon chain having 15 to 18 carbon atoms, in terms of the ease with which the group can enter between the molecular chains of the cellulose acylate (a) and can easily serve as a lubricant for the molecular chains of the cellulose acylate (a).

In the reaction of R¹¹In the case where the group represented is an aliphatic hydrocarbon group containing an alicyclic group, the group preferably has 1 or 2 alicyclic groups, more preferably 1 alicyclic group, from the viewpoint that the group easily enters between molecular chains of the resin.

In the reaction of R¹¹In the case where the group represented is an aliphatic hydrocarbon group having an alicyclic group, the alicyclic group in the group is preferably an alicyclic group having 3 or 4 carbon atoms, more preferably an alicyclic group having 3 carbon atoms, in terms of ease of entry of the group between molecular chains of the resin.

In terms of preventing squeak noise in a resin molded product, R is defined as¹¹The group represented is preferably a linear saturated aliphatic hydrocarbon group, a linear unsaturated aliphatic hydrocarbon group, a branched saturated aliphatic group or a branched unsaturated aliphatic hydrocarbon group, and a linear saturated aliphatic hydrocarbon group is particularly preferred. The preferred carbon number in these aliphatic hydrocarbon groups is as described above.

From R¹¹The group represented may be a group obtained by substituting a hydrogen atom in an aliphatic hydrocarbon group with a halogen atom (e.g., a fluorine atom, a bromine atom, and an iodine atom), an oxygen atom, a nitrogen atom, or the like, and is preferably an aliphatic hydrocarbon group in which a hydrogen atom is unsubstituted.

R¹²Represents an aliphatic hydrocarbon group having 9 to 28 carbon atoms. From R¹²Examples of the radicals indicatedAnd by R¹¹Examples of groups represented are similar. From R¹²The number of carbon atoms of the group represented is preferably as follows.

In terms of the ease with which the group serves as a lubricant for the molecular chain of the cellulose acylate (A), the group represented by R¹²The group represented is preferably an aliphatic hydrocarbon group having 10 or more carbon atoms, more preferably an aliphatic hydrocarbon group having 11 or more carbon atoms, and still more preferably an aliphatic hydrocarbon group having 16 or more carbon atoms. From the point of easy group entry between molecular chains of the resin, from R¹²The group represented by (b) is preferably an aliphatic hydrocarbon group having 24 or less carbon atoms, more preferably an aliphatic hydrocarbon group having 20 or less carbon atoms, and still more preferably an aliphatic hydrocarbon group having 18 or less carbon atoms. From R¹²The radicals indicated are particularly preferably aliphatic hydrocarbon radicals having 18 carbon atoms.

In terms of preventing squeak noise in a resin molded product, R is defined as¹²The group represented is preferably a linear saturated aliphatic hydrocarbon group, a linear unsaturated aliphatic hydrocarbon group, a branched saturated aliphatic group or a branched unsaturated aliphatic hydrocarbon group, and particularly preferably a linear saturated aliphatic hydrocarbon group. The preferred carbon number in these aliphatic hydrocarbon groups is as described above.

From R²¹、R²²、R³¹、R³²、R⁴¹、R⁴²、R⁴³、R⁵¹、R⁵²、R⁵³And R⁵⁴The specific and preferred forms of the radicals indicated and the pairs R¹¹Similar to those described.

Shown below are compounds having from 7 to 28 carbon atoms and represented by R¹¹、R²¹、R²²、R³¹、R³²、R⁴¹、R⁴²、R⁴³、R⁵¹、R⁵²、R⁵³And R⁵⁴Specific examples of the aliphatic hydrocarbon group represented by (A) and (B) and (C) a group represented by R and having 9 to 28 carbon atoms¹²Specific examples of the aliphatic hydrocarbon group are shown, but the exemplary embodiments are not limited to these specific examples.

One kind of ester compound (e1) other than the ester compound used as the plasticizer (D) may be used alone, or two or more kinds of ester compounds may be used in combination.

In addition, the resin composition of the exemplary embodiment includes an oxidation inhibitor or a stabilizer as the other component (E). The oxidation inhibitor or stabilizer preferably contains at least one compound (e2) selected from the group consisting of hindered phenol compounds, tocopherol compounds, tocotrienol compounds, phosphite compounds and hydroxylamine compounds.

Specific examples of the compound (e2) include: hindered phenolic compounds such as "Irganox 1010", "Irganox 245", "Irganox 1076" (manufactured by BASF), "ADK STAB AO-80", "ADK STAB AO-60", "ADKSTABAO-50", "ADK STAB AO-40", "ADK STAB AO-30", "ADK STAB AO-20", "ADK STAB AO-330" (manufactured by ADEKA), "submillizer GA-80", "submillizer GM" and "submillizer GS" (manufactured by SUMITOMCHEMICAL CO., LTD.); phosphite compounds such as "Irgafos 38" (bis (2, 4-di-tert-butyl-6-methylphenyl) -ethyl-phosphite) manufactured by BASF, "Irgafos 168" manufactured by BASF, "Irgafos TNPP" manufactured by BASF, and "IrgafosP-EPQ" manufactured by BASF; and hydroxylamine compounds such as "Irgastab FS-042" manufactured by BASF.

Further, specific examples of the tocopherol compound in the compound (e2) include the following compounds.

Specific examples of the tocotrienol compound in compound (e2) include the following compounds.

[ method for producing resin composition ]

Examples of the method for producing the resin composition of the exemplary embodiment include: a method of mixing and melt-kneading the component (A), the component (B) and the component (C) and, if necessary, the component (D) and the other component (E); or a method of dissolving the component (A), the component (B) and the component (C) and, if necessary, the component (D) and the other component (E) in a solvent; and so on. The unit of melt kneading is not particularly limited, and examples thereof include a twin-screw extruder, a henschel mixer, a banbury mixer, a single-screw extruder, a multi-screw extruder, or a co-kneader, and the like.

< resin molded article >

The resin molded article of the exemplary embodiment contains the resin composition of the exemplary embodiment. That is, the resin molded article of the exemplary embodiment has the same formulation as the resin composition of the exemplary embodiment.

The molding method of the resin molded article of the exemplary embodiment is preferably injection molding in terms of obtaining a high degree of freedom in shape. Therefore, the resin molded article of the exemplary embodiment is preferably an injection molded article obtained by injection molding in terms of obtaining a high degree of freedom in shape.

The cylinder temperature during injection molding of the resin molded article of the exemplary embodiment is, for example, 160 ℃ to 280 ℃, and preferably 180 ℃ to 240 ℃. The mold temperature during injection molding of the resin molded article according to the exemplary embodiment is, for example, 40 ℃ to 90 ℃, and more preferably 40 ℃ to 60 ℃.

Injection molding of the resin molded article of the exemplary embodiment may be performed using, for example, commercially available equipment such as NEX500 manufactured by NISSEI PLASTIC input standard co, NEX150 manufactured by NISSEI plasticintestriol, ltd, NEX7000 manufactured by NISSEI PLASTIC input standard co, ltd, NEX7000 manufactured by NISSEI PLASTIC input standard co, PNX40 manufactured by ltd, and SE50D manufactured by SUMITOMO machine corp.

The molding method for obtaining the resin molded article of the exemplary embodiment is not limited to the above-described injection molding, and may be, for example, extrusion molding, blow molding, hot press molding, calendar molding, coating molding, cast molding, dip molding, vacuum molding, transfer molding, or the like may be applied to the molding method.

The resin molded article of the exemplary embodiment is suitable for applications such as electronic/electric devices, office equipment, home appliances, automotive interior materials, toys, or containers. Specific applications of the resin molded article of the exemplary embodiment include: a housing of an electronic/electric device or a home appliance; various components of electronic/electric devices or home appliances; an automotive interior trim part; building blocks are assembled into a toy; a plastic model kit; a storage case for CD-ROMs or DVDs; tableware; beverage bottles; a food tray; a packaging material; a film; or a sheet; and so on.