阅读说明：本技术 树脂组合物及树脂成型体 (Resin composition and resin molded article ) 是由 田中凉 宫崎佳奈 森山正洋 八百健二 于 2018-07-27 设计创作，主要内容包括：一种树脂组合物,包括纤维素酰化物(A)、聚酯树脂(B)和含有具有环氧基的腰果酚基化合物的腰果酚组合物(C)。(A resin composition comprising a cellulose acylate (A), a polyester resin (B) and a cardanol composition (C) containing a cardanol-based compound having an epoxy group.)

1. A resin composition comprising:

a cellulose acylate (A) which is a cellulose acylate,

a polyester resin (B), and

a cardanol composition (C) containing a cardanol-based compound having an epoxy group.

2. The resin composition according to claim 1, further comprising a polymer (D) selected from at least one of: and an olefin polymer comprising 60 mass% or more of a structural unit derived from an α -olefin, the core-shell structure having a core layer and a shell layer comprising a polymer of an alkyl (meth) acrylate on the surface of the core layer.

3. The resin composition according to claim 1 or 2, further comprising a poly (meth) acrylate compound (E) in the matrix, the poly (meth) acrylate compound (E) comprising 50 parts by mass or more of a structural unit derived from an alkyl (meth) acrylate.

4. The resin composition according to any one of claims 1 to 3, wherein the cellulose acylate (A) is at least one selected from Cellulose Acetate Propionate (CAP) and Cellulose Acetate Butyrate (CAB).

5. The resin composition according to any one of claims 1 to 4, wherein the polyester resin (B) is a polyhydroxyalkanoate.

6. The resin composition according to claim 5, wherein the polyester resin (B) is polylactic acid.

7. The resin composition according to any one of claims 1 to 6, wherein the cardanol composition (C) further comprises a compound selected from at least one of the following: a polymer obtained by polymerizing a compound represented by the general formula (CDN1) with a compound represented by the general formula (CDN1),

[ formula 1]

In the general formula (CDN1), 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 group represented by the group (EP), 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 or more and 4 or less,

it is noted that a plurality of R exists when P2 is greater than or equal to 2²Each of which may be a different group or the same group,

in the formulae (CDN1) and in the radical (EP), L_EPRepresents a single bond or a divalent linking group, it being noted that when a group represented by the group (EP) is present as R²When multiple L's are present in the formula (CDN1)_EPEach may be the same group or different groups.

8. The resin composition according to any one of claims 1 to 7, wherein the cardanol composition (C) has an epoxy equivalent of 500 or less.

9. The resin composition according to any one of claims 1 to 8, wherein the mass ratio (B/A) of the polyester resin (B) to the cellulose acylate (A) is greater than or equal to 0.05 and less than or equal to 0.5.

10. The resin composition according to any one of claims 1 to 9, wherein a mass ratio (C/a) of the cardanol composition (C) to cellulose acylate (a) is greater than or equal to 0.01 and less than or equal to 0.3.

11. The resin composition according to any one of claims 1 to 10, wherein a mass ratio (C/B) of the cardanol composition (C) to the polyester resin (B) is greater than or equal to 0.15 and less than or equal to 3.75.

12. The resin composition according to claim 10 or 11, wherein a mass ratio (C/(a + B + C)) of the cardanol composition (C) to the sum of the cellulose acylate (a), the polyester resin (B), and the cardanol composition (C) is greater than or equal to 0.015 and less than or equal to 0.245.

13. A resin molded body comprising the resin composition according to any one of claims 1 to 12.

14. The resin molded body according to claim 13, wherein the resin molded body is an injection molded body.

Technical Field

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

Background

Conventionally, a variety of substances are provided as resin compositions, and these substances are used for various purposes. The resin composition is particularly used for various parts, housings, and the like in articles such as household appliances and automobiles. In addition, thermoplastic resins are also used in parts of housings of articles such as office equipment and electronic and electrical equipment.

In recent years, vegetable resins have been utilized, and cellulose acylate is one of conventionally known vegetable resins.

For example, patent document 1 discloses "a resin composition containing a cellulose ester resin, a compound including adipate, and a polyhydroxyalkanoate resin".

Disclosure of Invention

Problems to be solved by the invention

Incidentally, the cellulose acylate (A) is characterized by high transparency. However, in the resin material containing the polyester compound (B) in the cellulose acylate (a), the transparency is sometimes poor, although the transparency is one of the characteristics of the cellulose acylate (a).

Therefore, it is an object of the present invention to provide a resin composition having high transparency as compared with when a cardanol composition containing only a cardanol-based compound having no epoxy group is included as a cardanol composition in a resin composition including a cellulose acylate (a) and a polyester resin (B).

Means for solving the problems

The above problems are solved by the following means.

<1>

A first aspect of the present invention is a resin composition comprising:

a cellulose acylate (A) which is a cellulose acylate,

a polyester resin (B), and

a cardanol composition (C) containing a cardanol-based compound having an epoxy group.

<2>

Another aspect of the present invention is the resin composition according to <1>, which further comprises at least one polymer (D) selected from the group consisting of: a polymer having a core-shell structure having a core layer and a shell layer including a polymer of an alkyl (meth) acrylate on a surface of the core layer; and an olefin polymer comprising 60% by mass or more of a structural unit derived from an alpha-olefin.

<3>

In the resin composition according to <1> or <2>, it may further include a poly (meth) acrylate compound (E) including 50 parts by mass or more of a structural unit derived from an alkyl (meth) acrylate.

<4>

In the resin composition according to any one of <1> to <3>, the cellulose acylate (a) may be at least one selected from Cellulose Acetate Propionate (CAP) and Cellulose Acetate Butyrate (CAB).

<5>

In the resin composition according to any one of <1> to <4>, the polyester resin (B) may be polyhydroxyalkanoate.

<6>

In the resin composition according to <5>, the polyester resin (B) may be polylactic acid.

<7>

In the resin composition according to any one of <1> to <6>, the cardanol composition (C) may further include at least one compound selected from a compound represented by general formula (CDN1) and a polymer obtained by polymerizing a compound represented by general formula (CDN 1).

[ formula 1]

In the general formula (CDN1), 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 group represented by the group (EP), 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 or more and 4 or less,

it is noted that a plurality of R exists when P2 is greater than or equal to 2²Each of which may be a different group or the same group,

in the formulae (CDN1) and in the radical (EP), L_EPRepresents a single bond or a divalent linking group, it being noted that when a group represented by the group (EP) is present as R²When multiple L's are present in the formula (CDN1)_EPEach may be the same group or different groups.

<8>

In the resin composition according to any one of <1> to <8>, the epoxy equivalent of the cardanol composition (C) may be 500 or less.

<9>

In the resin composition according to any one of <1> to <8>, the mass ratio (B/a) of the polyester resin (B) to the cellulose acylate (a) may be 0.05 or more and 0.5 or less.

<10>

In the resin composition according to any one of <1> to <9>, a mass ratio (C/a) of the cardanol composition (C) to cellulose acylate (a) may be greater than or equal to 0.01 and less than or equal to 0.3.

<11>

In the resin composition according to any one of <1> to <10>, a mass ratio (C/B) of the cardanol composition (C) to the polyester resin (B) may be greater than or equal to 0.15 and less than or equal to 3.75.

<12>

In the resin composition according to <10> or <11>, the mass ratio (C/(a + B + C)) of the cardanol composition (C) to the sum of the cellulose acylate (a), the polyester resin (B), and the cardanol composition (C) may be greater than or equal to 0.015 and less than or equal to 0.245.

<13>

Another aspect of the present invention is a resin molded body comprising the resin composition according to any one of <1> to <12 >.

<14>

The resin molded body according to <13> may be an injection molded body.

ADVANTAGEOUS EFFECTS OF INVENTION

According to the aspect <1>, <2>, <3>, <6> or <7>, the resin composition having high transparency is provided, compared to when the cardanol composition containing only the cardanol-based compound having no epoxy group is included as the cardanol composition in the resin composition including the cellulose acylate (a) and the polyester resin (B).

According to the aspect <4>, there is provided the resin composition having high transparency as compared with when the cellulose acylate (a) is cellulose Diacetate (DAC).

According to the aspect <5>, there is provided the resin composition having high transparency as compared with when the polyester resin (B) is polyethylene terephthalate.

According to the aspect <8>, there is provided a resin composition having high transparency, compared with when the epoxy equivalent of the cashew phenol composition (C) is more than 500.

According to the aspect <9>, the resin composition having a high elastic modulus is provided as compared with when the mass ratio (B/a) of the polyester resin (B) to the cellulose acylate (a) is less than 0.05, and the resin composition having a high impact strength is provided as compared with when the mass ratio (B/a) is more than 0.5.

According to the aspect <10>, there is provided a resin composition having high transparency, as compared with when the mass ratio (C/a) of the eugenol composition (C) to the cellulose acylate (a) is less than 0.01 or more than 0.3.

According to the aspect <11>, there is provided the resin composition having high transparency, as compared with when the mass ratio (C/B) of the cashew phenol composition (C) to the polyester resin (B) is less than 0.15 or more than 3.75.

According to the aspect <12>, there is provided a resin composition having high transparency, compared to when the mass ratio (C/(a + B + C)) of the cashew phenol composition (C) to the sum of the cellulose acylate (a), the polyester resin (B), and the cardanol composition (C) is less than 0.015 or more than 0.245.

According to the aspect <13>, there is provided a resin molded body having high transparency, compared to when a cardanol composition including a cellulose acylate (a) and a polyester resin (B) and further including only a cardanol compound having no epoxy group as a resin composition of the cardanol composition is applied.

According to the aspect <14>, there is provided an injection-molded body having high transparency as compared with when a cardanol composition including a cellulose acylate (a) and a polyester resin (B) and further including only a cardanol composition containing a cardanol-based compound having no epoxy group is applied as a resin composition of the cardanol composition.

Detailed Description

Embodiments will be described below as examples of the present invention.

It is to be noted that, in the present specification, when a plurality of substances corresponding to each component are present in a target, the amount of each component in the target refers to the total content or total content of the plurality of substances present in the target unless otherwise specified.

In addition, the symbol "polymer of A" is an expression including not only a homopolymer of A but also a copolymer of A and a unit other than A. Similarly, the symbol "copolymer of A and B" is an expression including not only a copolymer of A and B alone (hereinafter also referred to as "homo-copolymer" where appropriate) but also a copolymer of A and B with a monomer other than A and B.

Further, the cellulose acylate (a), the polyester resin (B), the cardanol composition (C), the polymer (D) and the poly (meth) acrylate compound (E) are also referred to as a component (a), a component (B), a component (C), a component (D) and a component (E), respectively.

< resin composition >

The resin composition of the present embodiment includes a cellulose acylate (a), a polyester resin (B), and a cardanol composition (C) containing a cardanol-based compound having an epoxy group.

The resin composition of the present embodiment may further include other components such as the polymer (D), the poly (meth) acrylate compound (E), and the like.

Here, conventionally, the cellulose acylate (a) (specifically, a cellulose acylate in which a part of the hydroxyl groups is substituted with acyl groups) is composed of a non-edible resource, and since it is a primary derivative which does not require chemical polymerization, it is an environmentally friendly resin material. In addition, it has a high elastic modulus as a resin material due to its strong hydrogen bonding property. In addition, it has the characteristic of high transparency.

However, in the resin material containing the polyester compound (B) in the cellulose acylate (a), the transparency is sometimes poor, although the transparency is one of the characteristics of the cellulose acylate (a). This is because, in the resin composition comprising both the component (a) and the component (B), a sea-island structure is formed in which the polyester resin (B) is dispersed in the sea of the cellulose acylate (a) in an island shape, and the refractive indices of both generally form the following relationship: component (a) > component (B); therefore, the transparency is considered to be decreased due to the difference in refractive index of the sea-island portion.

In contrast, by including the cellulose acylate (a), the polyester resin (B), and the cardanol composition (C) containing a cardanol-based compound having an epoxy group, high transparency of the resin composition of the present embodiment is obtained.

The reason is presumed to be as follows.

The cardanol-based compound has high affinity for both the cellulose acylate (a) and the polyester compound (B), and also exhibits high dispersibility for both. However, when particularly such a cardanol-based compound has an epoxy group, its affinity for component (B) is much more altered, and relatively speaking, it may be more located on the component (B) side. In other words, when the cardanol composition (C) containing a cardanol-based compound having an epoxy group is added to a resin system including the component (a) and the component (B), the proportion of the component (C) present is higher in the component (B) than in the component (a). In addition, since component (C) generally has a larger refractive index than component (B), the difference in refractive index between the sea-island parts becomes smaller than when component (C) is not contained, whereby transparency is improved.

From the above, it is presumed that the resin composition of the present embodiment obtains high transparency.

In addition, in the present embodiment, by including the component (C), a resin composition in which water absorption is suppressed is obtained; in other words, a resin composition having excellent water resistance was obtained.

Hereinafter, the components in the resin composition of the present embodiment will be described in detail.

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

The cellulose acylate (a) is a resin such as a cellulose derivative in which at least a part of hydroxyl groups in cellulose is substituted (acylated) with acyl groups. Specifically, the cellulose acylate (a) is, for example, a cellulose derivative represented by the general formula (CE).

[ formula 2]

General formula (CE)

In the general formula (CE), R^CE1、R^CE2And R^CE3Each independently represents a hydrogen atom or an acyl group. n represents an integer of 2 or more. However, n R^CE1N R^CE2And n R^CE3At least a part of (a) represents an acyl group.

It is noted that R is represented by^CE1、R^CE2And R^CE3The acyl group represented is preferably an acyl group having 1 or more and 6 or less carbon atoms.

In the general formula (CE), although the range of n is not particularly limited, it is preferably 200 or more and 1,000 or less, more preferably 500 or more and 1,000 or less.

In the general formula (CE), R^CE1、R^CE2And R^CE3The fact that each independently represents an acyl group shows that at least a part of the hydroxyl groups in the cellulose derivative represented by the general formula (CE) is acylated.

In other words, n R in the molecule of the cellulose derivative represented by the general formula (CE)^CE1May be all the same, some the same, or different from each other. Similarly, n R^CE2And n R^CE3They may be the same, partially the same, or different from each other.

Here, the cellulose acylate (a) preferably has, as the acyl group, an acyl group having 1 or more and 6 or less carbon atoms. It is possible to obtain a resin molded body having excellent impact resistance while suppressing a decrease in transparency, as compared with when the acyl group has 7 or more carbon atoms.

Acyl group represented by the structure "-CO-R^ACIs "represents, and R^ACRepresents a hydrogen atom or a hydrocarbon group (more preferably a hydrocarbon group having 1 or more and 5 or less carbon atoms).

From R^ACThe hydrocarbon group represented by (a) may be linear, branched or cyclic, but is more preferably linear.

From R^ACThe hydrocarbon group represented may be a saturated hydrocarbon group or an unsaturated hydrocarbon group, but a saturated hydrocarbon group is more preferable.

From R^ACThe hydrocarbon group represented may have another atom (e.g., oxygen, nitrogen, etc.) other than carbon and hydrogen, but a hydrocarbon group composed of only carbon and hydrogen is more preferable.

Examples of acyl groups include formyl, acetyl, propionyl, butyryl (butyryl), propionyl, hexanoyl, and the like.

From the viewpoint of improving moldability and improving transparency of the resin composition, an acyl group having 2 or more and 4 or less carbon atoms is even more preferable as the acyl group, and an acyl group having 2 or more and 3 or less carbon atoms is even more preferable among these.

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

The cellulose acylate (a) may be used alone or in combination of two or more.

Even among these, from the viewpoint of improving the transparency of the resin composition, as the cellulose acylate (a), Cellulose Acetate Propionate (CAP) and Cellulose Acetate Butyrate (CAB) are preferable, and Cellulose Acetate Propionate (CAP) is more preferable.

From the viewpoint of improving moldability of the resin composition and improving tensile elongation at break of the resin molded article, the weight-average polymerization degree of the cellulose acylate (a) is preferably 200 or more and 1,000 or less, and more preferably 500 or more and 1,000 or less.

Here, the weight-average degree of polymerization can be determined from the weight-average molecular weight (Mw) in the following procedure.

First, the weight average molecular weight (Mw) of the cellulose acylate (A) was measured by conversion of polystyrene with tetrahydrofuran using a gel permeation chromatography apparatus (GPC apparatus: manufactured by Tosoh Corporation, HLC-8320GPC, column: TSKgel. alpha. -M).

Subsequently, the polymerization degree of the cellulose acylate (a) is determined by dividing by the molecular weight of the constituent unit of the cellulose acylate (a). Note that, for example, when the substituent of the cellulose acylate is an acetyl group, the molecular weight of the constituent unit is 263 when the degree of substitution is 2.4, and the molecular weight of the constituent unit is 284 when the degree of substitution is 2.9.

From the viewpoint of improving moldability and improving transparency of the resin composition, the degree of substitution of the cellulose acylate (a) is preferably 2.1 or more and 2.85 or less, more preferably 2.2 or more and 2.85 or less, even more preferably 2.3 or more and 2.5 or less, and particularly preferably 2.35 or more and 2.8 or less.

It is to be noted that, in the Cellulose Acetate Propionate (CAP), the ratio of the substitution degree between acetyl and propionyl (acetyl/propionyl) is preferably greater than or equal to 5/1 and less than or equal to 1/20, and more preferably greater than or equal to 3/1 and less than or equal to 1/15, from the viewpoint of improving moldability of the resin composition and improving transparency.

From the viewpoint of improving moldability and improving transparency of the resin composition, in Cellulose Acetate Butyrate (CAB), the ratio of the degree of substitution between acetyl group and butyryl group (acetyl/butyryl group) is preferably greater than or equal to 5/1 and less than or equal to 1/20, and more preferably greater than or equal to 4/1 and less than or equal to 1/15.

Here, the degree of substitution is an index indicating the degree of substitution of the hydroxyl group of cellulose with an acyl group. In other words, the degree of substitution is used as an index indicating the degree of acylation of the cellulose acylate (a). Specifically, the degree of substitution refers to the number of average substitution within the molecule, in which three hydroxyl groups in the D-glucopyranose unit of the cellulose acylate are substituted with acyl groups.

In addition, the degree of substitution is H¹NMR (manufactured by JMN-ECA/JEOL RESONANCE co., ltd.) was measured from the integral ratio of cellulose-derived hydrogen and acyl-derived peaks.

[ polyester resin (B): component (B) ]

For example, the polyester resin (B) is a polymer of hydroxyalkanoate (hydroxyalkanoic acid), a polycondensate of polycarboxylic acid and polyol, a ring-opening polycondensate of cyclic lactam, or the like.

An aliphatic polyester resin is preferably used as the polyester resin (B). Examples of the aliphatic polyester resin include polyhydroxyalkanoates (polymers of hydroxyalkanoates), polycondensates of aliphatic diols and aliphatic carboxylic acids, and the like.

Among these, polyhydroxyalkanoate is preferable as the polyester resin (B) from the viewpoint of improving the transparency of the resin composition.

The polyester resin (B) may be used alone or in combination of two or more.

As an example of the polyhydroxyalkanoate, a compound having a structural unit represented by the general formula (PHA) is given.

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

[ formula 3]

General formula (PHA)

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

In the general formula (PHA), an alkylene group having 3 or more and 6 or less carbon atoms is preferably used as represented by R^PHA1Alkylene group represented by (a). From R^PHA1The alkylene group represented by (a) may be linear or branched, but is preferably branched.

Here, in the general formula (PHA), R^PHA1The fact that represents an alkylene group indicates that 1) R^PHA1Having [ O-R ] representing the same alkylene group^PHA1-C(＝O)-]Structure, and 2) R^PHA1Having a plurality of structures [ O-R ] representing different alkylene groups^PHA1-C(＝O)-](i.e., [ O-R ]^PHA1A-C(＝O)-][O-R^PHA1B-C(＝O)-]Structure) (R)^PHA1Are alkylene groups having different numbers of carbon atoms or different branches).

In other words, the polyhydroxyalkanoate may be a homopolymer of one type of hydroxyalkanoate (hydroxyalkanoic acid), and may be a copolymer of two or more types of hydroxyalkanoate (hydroxyalkanoic acid).

In the general formula (PHA), the upper limit of n is not particularly limited, but is exemplified by 2,000 or less. The range of n is preferably greater than or equal to 500 and less than or equal to 10,000, and more preferably greater than or equal to 1,000 and less than or equal to 8,000.

Examples of polyhydroxyalkanoates include homopolymers such as hydroxyalkanoic acids (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, 2-hydroxy-n-octanoic acid, etc.), or copolymers of two or more of these hydroxyalkanoic acids.

Even among these, from the viewpoint of suppressing the decrease in transparency and improving the impact resistance of the obtained resin molded article, the polyhydroxyalkanoate is preferably a homopolymer of a branched hydroxyalkanoic acid having 2 or more and 4 or less carbon atoms, a homo-copolymer of a branched hydroxyalkanoic acid having 2 or more and 4 or less carbon atoms and a branched hydroxyalkanoic acid having 5 or more and 7 or less carbon atoms, more preferably a homopolymer of a branched hydroxyalkanoic acid having 3 carbon atoms (in other words, polylactic acid), a homo-copolymer of 3-hydroxybutyric acid and 3-hydroxyhexanoic acid (in other words, polyhydroxybutyric acid-hexanoate), and even more preferably a homopolymer of a branched hydroxyalkanoic acid having 3 carbon atoms.

It is to be noted that the number of carbon atoms of the hydroxyalkanoic acid is the number of carbon atoms including also the carboxyl group.

Polylactic acid is a polymer compound obtained by polymerizing lactic acid through an ester bond.

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

Examples of the "compound copolymerizable with L-lactic acid and D-lactic acid" include polycarboxylic acids 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, undecanoic acid, dodecanoic acid, terephthalic acid, and anhydrides thereof; polyhydric alcohols 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, tetramethylene glycol, and 1, 4-hexanedimethanol; polysaccharides, such as cellulose; aminocarboxylic acids such as alpha-amino acids; hydroxycarboxylic acids such as 5-hydroxyvaleric acid, 2-hydroxyhexanoic acid, 3-hydroxyhexanoic acid, 4-hydroxyhexanoic acid, 5-hydroxyhexanoic acid, 6-hydroxymethyl-hexanoic acid and mandelic acid; or cyclic esters such as glycolide, β -methyl-valerolactone, γ -valerolactone and caprolactone.

It is known that polylactic acid can be produced by lactide in a lactide method, which is a direct polymerization method in which lactic acid is polymerized by heating in a solvent under reduced pressure while removing water and the like.

In the polyhydroxybutyrate-hexanoate ester, the copolymerization ratio of 3-hydroxyhexanoate (3-hydroxyhexanoate ester) to a copolymer of 3-hydroxybutyrate (3-hydroxybutyrate) and 3-hydroxyhexanoate (3-hydroxyhexanoate ester) is preferably 3 mol% or more and 20 mol% or less, more preferably 4 mol% or more and 15 mol% or less, and even more preferably 5 mol% or more and 12 mol% or less, from the viewpoint of improving the transparency of the resin composition.

It is to be noted that the method for measuring the copolymerization ratio of 3-hydroxycaproic acid (3-hydroxycaproic ester) uses H¹NMR the hexanoate ester ratio was calculated from the integrated values of the peaks at the hexanoate and butyrate ends.

From the viewpoint of improving the transparency of the resin composition, the weight average molecular weight (Mw) of the polyester resin (B) may be greater than or equal to 10,000 and less than or equal to 1,000,000 (preferably greater than or equal to 50,000 and less than or equal to 800,000, more preferably greater than or equal to 100,000 and less than or equal to 600,000).

The weight average molecular weight (Mw) of the polyester resin (B) is a value measured by Gel Permeation Chromatography (GPC). Specifically, molecular weight measurement was performed by GPC using HLC-8320GPC manufactured by Tosoh (Corp.) as a measurement device and TSKgel GMHHR-M + TSKgel GMHHR-M (7.8 mm.D.30cm) columns manufactured by Tosoh (Corp.) using a chloroform solvent. In addition, from the measurement results, the weight average molecular weight (Mw) was calculated using a molecular weight calibration curve created from a monodisperse polystyrene standard sample.

[ cardanol composition (C) containing cardanol-based compound having epoxy group: component (C) ]

The resin composition of the present embodiment includes a cardanol composition (C) containing a cardanol-based compound having an epoxy group.

Here, the "cardanol composition" means a mixture of natural compounds made from cashew nuts, or a derivative of the mixture. For example, the following compounds (1) to (4) are contained in a mixture of natural compounds made from cashew nuts.

The "cardanol-based compound having an epoxy group" contained in the cardanol composition (C) means a compound in which: the component having an epoxy group in a molecular structure and contained in a natural compound made of cashew nuts, or the derivative having an epoxy group in a molecular structure and contained in a natural compound made of cashew nuts (for example, the compounds of the following (1) to (4)).

[ formula 4]

In other words, the resin composition of the present embodiment may include a mixture of natural compounds made of cashew nuts (hereinafter simply referred to as "cashew-derived mixture") as the component (C), wherein the mixture includes a cardanol-based compound having at least one epoxy group.

In addition, it may contain a derivative of a natural compound mixture (cashew-derived mixture) made from cashew, wherein the derivative includes a cardanol-based compound having at least one epoxy group.

It is to be noted that the derivatives include the following mixtures, monomers and the like.

Mixture with adjusted composition ratio of components in cashew nut-derived mixture

Simple substances to separate only defined components from cashew-derived mixtures

-mixtures comprising modified products obtained by further modifying components in cashew derived mixtures

Mixtures comprising polymers obtained by further polymerizing components of the cashew-derived mixture

-mixtures comprising modified polymers obtained by further modifying and polymerizing components in cashew-derived mixtures

Mixtures comprising modified products obtained by further modifying the components of mixtures having adjusted composition ratios

Mixtures comprising polymers obtained by further polymerizing the components of the mixtures having adjusted composition ratios

Mixtures comprising modified polymers obtained by further modifying and polymerizing the components of the mixtures with adjusted composition ratios

Modified products obtained by further modification of the isolated simple substances polymers obtained by further polymerization of the isolated simple substances

Modified polymers obtained by further modification and polymerization of the isolated simple substances it is noted that the polymers also include multimers such as dimers and trimers.

From the viewpoint of improving the transparency of the resin composition, the content ratio of the cardanol-based compound having an epoxy group in the cardanol composition (C) is preferably 50% by mass or more, more preferably 60% by mass or more, and even more preferably 75% by mass or more.

It is to be noted that the cardanol-based compound having an epoxy group contained in the cardanol composition (C) may have an epoxy group at any position in the molecular structure. For example,

for example, it may have an epoxy group on a benzene ring via a divalent group formed by combining one or two or more groups selected from an unsaturated aliphatic group having — O-, an alkyl group, and a double bond.

For example, the-OH in the compounds of (1) to (4) may be epoxy modified and may be via the group "-O-L_EP-(L_EPRepresents a single bond or a divalent linking group) "and has an epoxy group at a certain position of the benzene ring. In addition, the compound of (1) to (4) wherein R is_CDNSome of the groups represented may be present in epoxidized form.

General formula (CDN1) -

The cardanol-based compound having an epoxy group contained in the cardanol composition (C) is preferably at least one compound selected from a polymer obtained by polymerizing a compound represented by the general formula (CDN1) and a compound represented by the general formula (CDN 1).

The transparency of the resin composition can be improved by the compound including at least one selected from the group consisting of the compound represented by the general formula (CDN1) and a polymer obtained by polymerizing the compound represented by the general formula (CDN 1).

[ formula 5]

In the general formula (CDN1), 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 group represented by the group (EP), 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 or more and 4 or less. It is noted that a plurality of R exists when P2 is greater than or equal to 2²Each may be the same group or different groups.

In the formulae (CDN1) and in the radical (EP), L_EPRepresents a single bond or a divalent linking group. It is to be noted that when R is regarded as²A plurality of L's present in the general formula (CDN1) when a group represented by the group (EP) is present_EPEach may be the same group or different groups.

In the general formula (CDN1), R¹The alkyl group which may have a substituent represented is preferably an alkyl group having 3 or more and 30 or less carbon atoms, more preferably an alkyl group having 5 or more and 25 or less carbon atoms, and even more preferably an alkyl group having 8 or more and 20 or less carbon atoms.

Examples of the substituent include epoxy group, hydroxyl group and the like.

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, tetradecan-1-yl and the like.

In the general formula (CDN1), R¹The unsaturated aliphatic group having a double bond and which may have a substituent represented is preferably an unsaturated aliphatic group having 3 or more and 30 or less carbon atoms, more preferably an unsaturated aliphatic group having 5 or more and 25 or less carbon atoms, and even more preferably an unsaturated aliphatic group having 8 or more and 20 or less carbon atoms.

The number of double bonds of the unsaturated aliphatic group is preferably 1 or more and 3 or less.

Those substituents listed as examples of substituents for the alkyl group are similarly given as examples of said substituents.

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, pentadec-7, 10, 14-trien-1-yl and the like.

In the general formula (CDN1), R¹Preferably pentadec-8-en-1-yl, decaPenta-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.

As R¹Those listed as examples of the alkyl group which may have a substituent and the unsaturated aliphatic group which may have a double bond and may have a substituent are similarly listed as R in the general formula (CDN1)²Preferable examples of the alkyl group which may have a substituent and the unsaturated aliphatic group which may have a double bond and may have a substituent are given.

In the formulae (CDN1) and in the radical (EP), L_EPExamples of the divalent linking group represented include alkylene groups (preferably alkylene groups having 1 or more and 4 or less carbon atoms, and more preferably alkylene groups having 1 carbon atom) which may have substituents, -CH₂CH₂OCH₂CH₂-groups and the like.

As examples of the aforementioned substituents, R is similarly given as a general formula (CDN1)¹Examples of the substituent(s) in (1) are those listed.

Methylene is preferred as L_EP。

The polymer polymerized from the compound represented by the general formula (CDN1) means a polymer obtained by polymerizing at least two or more compounds represented by the general formula (CDN1) with or without a linking group.

As an example of the polymer obtained by polymerizing the compound represented by the general formula (CDN1), a compound represented by the following general formula (CDN2) is given.

[ formula 6]

General formula (CDN2)

(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 group represented by the group (EP)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 or more and 3 or less, and P22 represents an integer of 0 or more and 2 or less. L is¹And L²Each independently represents a divalent linking group. n represents an integer of 0 or more and 10 or less. L is_EP1、L_EP2And L_EP3Each independently represents a single bond or a divalent linking group. It is noted that a plurality of R exists when P21 is greater than or equal to 2²¹A plurality of R's present when P22 is greater than or equal to 2²²And a plurality of R's present when P23 is greater than or equal to 2²³Each may be the same group or different groups. In addition, a plurality of R present when n is greater than or equal to 2¹²、R²²、L¹And L_EP2Each may be the same group or different group, and when n is 2 or more, a plurality of P22 present may be the same number or different numbers. )

As R in the general formula (CDN1)¹Those listed as examples of the alkyl group which may have a substituent and the unsaturated aliphatic group which may have a double bond and may have a substituent are similarly listed as R in the general formula (CDN2)¹¹、R¹²、R¹³、R²¹、R²²And R²³Preferable examples of the alkyl group which may have a substituent and the unsaturated aliphatic group which may have a double bond and may have a substituent are given.

Note that L in the general formula (CDN2) is L_EP1、L_EP2And L_EP3Examples of divalent linking groups represented are similarly given as L in formula (CDN1)_EPExamples of the divalent linking groups shown are those listed.

As L in the general formula (CDN2)¹And L²Examples of the divalent linking group represented are given of alkylene groups which may have a substituent (preferably alkylene groups having 1 or more and 15 or less carbon atoms, and more preferably alkylene groups having 1 or more and 2 or less carbon atoms).

It is to be noted that, as examples of the aforementioned substituents, R is similarly given as a general formula (CDN1)¹Examples of the substituent(s) in (1) are those listed.

In the general formula (CDN2), n is preferably greater than or equal to 0 and less than or equal to 3, and more preferably greater than or equal to 0 and less than or equal to 1.

Further, the polymer polymerized from the compound represented by the general formula (CDN1) may be, for example, a polymer obtained by three-dimensionally crosslinking with or without a linking group and polymerizing at least three or more compounds represented by the general formula (CDN 1). As an example of a polymer obtained by three-dimensionally crosslinking and polymerizing a compound represented by the general formula (CDN1), a compound having the following structure is given.

[ formula 7]

(in the above structural formula, R¹⁰、R²⁰P20 and L¹⁰Are each R in the general formula (CDN1)¹、R²P2 and L¹Synonyms of (d). It is noted that there are multiple R' s¹⁰、R²⁰And L¹⁰Each may be the same group or different groups. The plurality of P20 that are present may be the same number or different numbers. )

It is to be noted that, although the foregoing structural formula shows an aspect in which a methyl group is present between an epoxy group and an oxygen atom (-O-), an aspect in which an epoxy group and an oxygen atom (-O-) are directly bonded may be also possible, and a divalent linking group other than a methyl group may be interposed therebetween.

In addition, as an example of a polymer obtained by polymerizing a compound represented by the general formula (CDN1), a polymer obtained by polymerizing at least two or more unsaturated aliphatic groups having "an unsaturated aliphatic group having a double bond and which may have a substituent" represented by the general formula (CDN1) at a double bond position in the unsaturated aliphatic group is also given as R1.

Such a polymer obtained by polymerization at a double bond position in an unsaturated aliphatic group may be, for example, a dimer obtained by combining two compounds represented by the general formula (CDN1), and may be an oligomer or polymer obtained by combining three or more of the compounds.

A commercial product can be used as the cardanol composition (C) (component (C)) containing a cardanol-based compound having an epoxy group. For example, the following commercial products may be used.

Examples of commercial products include NC-513, NC-514S, NC-547, LITE 513E, Ultra LITE 513, and the like manufactured by Cardolite Corporation.

From the viewpoint of improving the transparency of the resin composition, the epoxy equivalent of the cardanol composition (C) (component (C)) is preferably 500 or less, more preferably 480 or less, and even more preferably 470 or less.

It is to be noted that the lower limit of the epoxy equivalent of the component (C) is preferably 300 or more, more preferably 350 or more, and even more preferably 400 or more from the viewpoint of molding processability.

The measurement of the epoxy equivalent of the cardanol composition (C) (component (C)) was performed according to ISO 3001.

[ polymer (D): component (D) ]

The polymer (D) is a polymer of at least one selected from a polymer having a core-shell structure with a core layer and a shell layer of a polymer including an alkyl (meth) acrylate on a surface of the core layer, and an olefin polymer including 60% by mass or more of a structural unit derived from an α -olefin.

The polymer (D) may have elasticity at room temperature (25 ℃), for example, and may have the same softening property as the thermoplastic resin at high temperature (thermoplastic elastomer).

When the polymer (D) is contained in the resin composition, plasticization is promoted when the resin composition is injection-molded.

The polymer (D) may be used alone or in combination of two or more.

(Polymer having core-shell Structure)

The polymer having a core-shell structure of the present embodiment is a polymer having a core-shell structure having a core layer and a shell layer on the surface of the core layer.

The polymer having a core-shell structure is a polymer in which a core layer is an innermost layer and a shell layer is an outermost layer (specifically, a polymer formed by graft polymerizing a polymer of alkyl (meth) acrylate to a polymer serving as a core layer to form a shell layer).

It is noted that there may be one or more other layers (e.g., greater than or equal to 1 and less than or equal to 6 other layers) between the core layer and the shell layer. It is to be noted that the polymer having a core-shell structure may be a multilayered polymer in which various types of polymers are graft-polymerized to the polymer serving as the core layer, if other layers are present.

Although the core layer is not particularly limited, a rubber layer is preferable. Examples of the rubber layer include layers of (meth) acrylic rubber, silicone rubber, styrene rubber, conjugated diene rubber, α -olefin rubber, nitrile rubber, urethane rubber, polyester rubber, polyamide rubber, copolymer rubber of two or more of these, and the like.

Even among these, the rubber layer is preferably a layer of (meth) acrylic rubber, silicone rubber, styrene rubber, conjugated diene rubber, α -olefin rubber, copolymer rubber of two or more of these, or the like.

It is to be noted that the rubber layer may be a rubber layer crosslinked by copolymerizing a crosslinking agent (divinylbenzene, allyl acrylate, butanediol diacrylate, etc.).

As an example of the (meth) acrylic rubber, a polymer rubber obtained by polymerizing a (meth) acrylic component such as an alkyl ester of (meth) acrylic acid having 2 or more and 6 or less carbon atoms, or the like is given.

As examples of the silicone rubber, rubbers composed of a silicon component (polydimethylsiloxane, polyphenylsiloxane, etc.) are given.

As examples of the styrene rubber, polymer rubbers obtained by polymerizing styrene components (styrene, α -methylstyrene, etc.) are given.

As an example of the conjugated diene rubber, a polymer rubber obtained by polymerizing a conjugated diene component (butadiene, isoprene, etc.) is given.

As an example of the α -olefin rubber, a polymer rubber obtained by polymerizing α -olefin components (ethylene, propylene, and 2-methylpropene) is given.

As examples of the copolymer rubber, a copolymer rubber obtained by polymerizing two or more types of (meth) acrylic acid components, a copolymer rubber obtained by polymerizing a (meth) acrylic acid component and a silicon component, and a copolymer rubber of a (meth) acrylic acid component, a conjugated diene component and a styrene component, and the like are given.

Examples of the alkyl (meth) acrylate in the polymer constituting the shell layer include methyl (meth) acrylate, ethyl (meth) acrylate, n-propyl (meth) acrylate, n-butyl (meth) acrylate, t-butyl (meth) acrylate, n-hexyl (meth) acrylate, 2-ethylhexyl (meth) acrylate, cyclohexyl (meth) acrylate, stearyl (meth) acrylate, octadecyl (meth) acrylate, and the like. In the alkyl (meth) acrylate, at least a part of hydrogen in the alkyl chain may be substituted. Examples of the substituent include amino group, hydroxyl group, halogen group and the like.

Even among these, in addition to promoting plasticization at the time of injection molding of the resin composition, from the viewpoint of improving transparency of the resin composition, it is preferable to use, as the polymer of the alkyl (meth) acrylate, a polymer of an alkyl (meth) acrylate in which the number of carbon atoms in the alkyl chain is 1 or more and 8 or less, more preferably a polymer of an alkyl (meth) acrylate in which the number of carbon atoms in the alkyl chain is 1 or more and 2 or less, and even more preferably a polymer of an alkyl (meth) acrylate in which the number of carbon atoms in the alkyl chain is 1. Copolymers of two or more alkyl acrylates differing in the number of carbon atoms in the alkyl chain are particularly preferred.

The polymer constituting the shell layer may be a polymer obtained by polymerizing at least one selected from a glycidyl group-containing vinyl compound and an unsaturated dicarboxylic anhydride in addition to the alkyl (meth) acrylate.

Examples of the glycidyl group-containing vinyl compound include glycidyl (meth) acrylate, glycidyl itaconate, diglycidyl itaconate, allyl glycidyl ether, styrene-4-glycidyl ether, 4-glycidylstyrene, and the like.

Examples of the unsaturated dicarboxylic acid anhydride include maleic anhydride, itaconic anhydride, glutaric anhydride, citraconic anhydride, aconitic anhydride and the like. Of these, maleic anhydride is even more preferable.

It is noted that the layers of the polymers described in the shell layers are cited as examples of one or more other layers between the core shell and the shell layers.

The content of the polymer of the shell layer is preferably 1% by mass or more and 40% by mass or less, more preferably 3% by mass or more and 30% by mass or less, and even more preferably 5% by mass or more and 15% by mass or less with respect to the entire polymer having a core-shell structure.

Although there is no particular limitation on the average primary particle diameter of the polymer having a core-shell structure, from the viewpoint of improving the transparency of the resin composition, in addition to promoting plasticization at the time of injection molding of the resin composition, it is preferably greater than or equal to 50nm and less than or equal to 500nm, more preferably greater than or equal to 50nm and less than or equal to 400nm, even more preferably greater than or equal to 100nm and less than or equal to 300nm, and particularly preferably greater than or equal to 150nm and less than or equal to 250 nm.

Note that the average primary particle diameter refers to a value measured by the following method. The particles were observed using a scanning electron microscope, the maximum size of the primary particles was taken as the primary particle diameter, and then the primary particle diameters of 100 particles were measured, and this was the average uniform secondary particle diameter. Specifically, this can be obtained by observing the dispersion morphology of the polymer having a core-shell structure in the resin composition using a scanning electron microscope.

The polymer having a core-shell structure can be prepared by a known method.

As an example of a known method, an emulsion polymerization method is given. Specifically, the following method is exemplified as the production method. First, after a mixture of monomers is emulsion-polymerized to form a core particle (core layer), another mixture of monomers is emulsion-polymerized in the presence of the core particle (core layer) to form a polymer having a core-shell structure in which a shell layer is formed around the core particle (core layer).

In addition, when another layer is formed between the core layer and the shell layer, emulsion polymerization of another mixture of monomers is repeated to obtain a polymer having a core-shell structure composed of the target core layer, the other layer, and the shell layer.

As examples of commercially available products of polymers having a core-shell structure, "METAPRENE" (registered trademark) manufactured by Mitsubishi Chemical (Corp.), "Kane Ace" (registered trademark) manufactured by Kaneka (Corp.), "PARALOID" (registered trademark) manufactured by Dow Chemical Japan (Ltd.), "stabhyloid" (registered trademark) manufactured by Aica Kogyo (co., Ltd.), and "PARAFACE" (registered trademark) manufactured by Kuraray (co., Ltd.), and the like are given.

(olefin Polymer)

The olefin polymer is preferably a polymer of an α -olefin and an alkyl (meth) acrylate, wherein the olefin polymer comprises 60% by mass or more of a structural unit derived from the α -olefin.

Examples of the α -olefin in the olefin polymer include ethylene, propylene, 2-methylpropene and the like. From the viewpoint of improving the transparency of the resin composition, an α -olefin having 2 or more and 8 or less carbon atoms is preferable, and an α -olefin having 2 or more and 3 or less carbon atoms is more preferable. Among these, ethylene is even more preferable.

Meanwhile, examples of the alkyl (meth) acrylate polymerized with the α -olefin include methyl (meth) acrylate, ethyl (meth) acrylate, n-propyl (meth) acrylate, n-butyl (meth) acrylate, t-butyl (meth) acrylate, n-hexyl (meth) acrylate, 2-ethylhexyl (meth) acrylate, cyclohexyl (meth) acrylate, stearyl (meth) acrylate, octadecyl (meth) acrylate, and the like. From the viewpoint of improving the transparency of the resin composition, an alkyl (meth) acrylate in which the number of carbon atoms in the alkyl chain is 1 or more and 8 or less is preferable, an alkyl (meth) acrylate in which the number of carbon atoms in the alkyl chain is 1 or more and 4 or less is more preferable, and an alkyl (meth) acrylate in which the number of carbon atoms in the alkyl chain is 1 or more and 2 or less is even more preferable.

Here, from the viewpoint of improving the transparency of the resin composition, the olefin polymer is preferably a polymer of ethylene and methyl acrylate or a polymer of ethylene and ethyl acrylate.

From the viewpoint of improving the transparency of the resin composition, in the olefin polymer, it is preferable to include 60% by mass or more and 97% by mass or less of the structural units derived from the α -olefin, and more preferable to include 70% by mass or more and 85% by mass or less.

The olefin may have another structural unit in addition to the structural unit derived from the α -olefin and the structural unit derived from the alkyl (meth) acrylate. However, the other structural unit may be 10% by mass or less with respect to the whole structural units in the olefin polymer.

[ poly (meth) acrylate compound (E): compound (E) ]

The poly (meth) acrylate compound (E) is a compound (resin) including 50% by mass or more of a structural unit derived from an alkyl (meth) acrylate (preferably 70% by mass or more, more preferably 90% by mass or more, and even more preferably 100% by mass).

If the matrix of the resin composition contains the poly (meth) acrylate compound (E), the elastic modulus of the resulting resin molded article may be improved.

The poly (meth) acrylate compound (E) may include a structural unit derived from a monomer other than (meth) acrylate.

It is to be noted that the structural unit (unit derived from a monomer) of the poly (meth) acrylate compound (E) may be of a single type or may be of two or more types.

In addition, the poly (meth) acrylate compound (E) may be used alone or in combination of two or more.

Examples of the alkyl (meth) acrylate include methyl (meth) acrylate, ethyl (meth) acrylate, n-propyl (meth) acrylate, n-butyl (meth) acrylate, n-pentyl (meth) acrylate, n-hexyl (meth) acrylate, n-heptyl (meth) acrylate, n-octyl (meth) acrylate, n-decyl (meth) acrylate, isopropyl (meth) acrylate, isobutyl (meth) acrylate, tert-butyl (meth) acrylate, isoamyl (meth) acrylate, pentyl (meth) acrylate, neopentyl (meth) acrylate, isohexyl (meth) acrylate, isoheptyl (meth) acrylate, isooctyl (meth) acrylate, 2-ethylhexyl (meth) acrylate, octyl (meth) acrylate, decyl (meth) acrylate, cyclohexyl (meth) acrylate, dicyclopentyl (meth) acrylate, and the like.

Even among these, as the alkyl (meth) acrylate in which the number of carbon atoms in the alkyl chain is 1 or more and 8 or less (preferably 1 or more and 4 or less, more preferably 1 or more and 2 or less, and even more preferably 1) is sufficient from the viewpoint of improving the transparency of the resin composition in addition to improving the elastic modulus of the resin molded body.

The shorter the alkyl chain of the poly (meth) acrylate compound (E), the closer the SP value is to that of the polyester resin (B); therefore, the compatibility of the poly (meth) acrylate compound (E) with the polyester resin (B) is improved, and the haze is improved.

In other words, a polymer including 50% by mass or more (preferably 70% by mass or more, more preferably 90% by mass or more, and even more preferably 100% by mass) of structural units derived from an alkyl (meth) acrylate in which the number of carbon atoms in the alkyl chain is greater than or equal to 1 and less than or equal to 8 (preferably greater than or equal to 1 and less than or equal to 4, more preferably greater than or equal to 1 and less than or equal to 2, and even more preferably 1) is sufficient for the poly (meth) acrylate compound (E).

Meanwhile, as the poly (meth) acrylate compound (E), a polymer in which the structural unit derived from an alkyl (meth) acrylate ester having a carbon number in the alkyl chain of 1 or more and 8 or less (preferably 1 or more and 4 or less, more preferably 1 or more and 2 or less, and even more preferably 1) is 100 mass% is sufficient. In other words, as the poly (meth) acrylate compound (E), a poly (meth) acrylic acid alkyl ester in which the number of carbon atoms in the alkyl chain is 1 or more and 8 or less (preferably 1 or more and 4 or less, more preferably 1 or more and 2 or less, and even more preferably 1) is sufficient. It is to be noted that, as the polyalkyl (meth) acrylate having 1 carbon atom in the alkyl chain, polymethyl methacrylate is preferable.

It is to be noted that, in the poly (meth) acrylate compound (E), examples of the monomer other than the alkyl (meth) acrylate include styrenes [ for example, a monomer having a styrene skeleton such as styrene, alkyl-substituted styrene (for example, α -methylstyrene, 2-methylstyrene, 3-methylstyrene, 4-methylstyrene, 2-ethylstyrene, 3-ethylstyrene, 4-ethylstyrene, etc.), halogen-substituted styrene (for example, 2-chlorostyrene, 3-chlorostyrene, 4-chlorostyrene, etc.), vinylnaphthalene (2-vinylnaphthalene, etc.), hydroxystyrene (4-vinylphenol, etc.), etc. ], unsaturated dicarboxylic anhydrides [ for example, "a compound having an ethylenic double bond and a dicarboxylic anhydride group", such as maleic anhydride, itaconic anhydride, glutaric anhydride, citraconic anhydride, aconitic anhydride, etc. ], and the like.

The weight average molecular weight (Mw) of the poly (meth) acrylate compound (E) is not particularly limited, but greater than or equal to 15,000 and less than or equal to 120,000 (preferably greater than or equal to 20,000 and less than or equal to 100,000, more preferably greater than or equal to 22,000 and less than or equal to 100,000, and even more preferably greater than or equal to 25,000 and less than or equal to 100,000) is sufficient.

In particular, the weight average molecular weight (Mw) of the poly (meth) acrylate compound (E) is preferably less than 50,000 (in other words, less than 50,000), more preferably 40,000 or less, and even more preferably 35,000 or less, from the viewpoint of improving the transparency of the resin composition in addition to improving the elastic modulus of the resin molded body. However, for the weight average molecular weight (Mw) of the poly (meth) acrylate compound (E), 15,000 or more is sufficient.

The weight average molecular weight (Mw) of the poly (meth) acrylate compound (E) is a value measured by Gel Permeation Chromatography (GPC). Specifically, molecular weight measurement was performed by GPC using a tetrahydrofuran solvent using HLC-8320GPC manufactured by Tosoh (Corp.) as a measurement device and a TSKgel α -M column manufactured by Tosoh (Corp.). In addition, based on the measurement results, the weight average molecular weight (Mw) was calculated using a molecular weight calibration curve created from monodisperse polystyrene standard samples.

[ content or mass ratio of component (A) to component (E) ]

The content or mass ratio of each component will be described. From the viewpoint of improving the transparency of the resin composition, the content or mass ratio of each component is preferably in the following range. Note that abbreviations for the respective components are as follows.

Component (A) ═ cellulose acylate (A)

Component (B) ═ polyester resin (B)

Component (C) is a cardanol composition (C) containing a cardanol-based compound having an epoxy group

Component (D) ═ polymer (D)

Component (E) ═ poly (meth) acrylate compound (E)

The mass ratio (B/a) of component (B) to component (a) is preferably greater than or equal to 0.05 and less than or equal to 0.5, more preferably greater than or equal to 0.06 and less than or equal to 0.35, and even more preferably greater than or equal to 0.075 and less than or equal to 0.25.

The mass ratio (C/a) of the component (C) to the component (a) is preferably greater than or equal to 0.01 and less than or equal to 0.3, more preferably greater than or equal to 0.03 and less than or equal to 0.25, and even more preferably greater than or equal to 0.05 and less than or equal to 0.2.

The mass ratio (C/B) of the component (C) to the component (B) is preferably greater than or equal to 0.15 and less than or equal to 3.75, more preferably greater than or equal to 0.5 and less than or equal to 3, and even more preferably greater than or equal to 0.75 and less than or equal to 2.

The mass ratio of the component (C) to the sum of the component (a), the component (B) and the component (C) (C/(a + B + C)) is preferably greater than or equal to 0.015 and less than or equal to 0.245, more preferably greater than or equal to 0.05 and less than or equal to 0.2, and even more preferably greater than or equal to 0.075 and less than or equal to 0.2.

The mass ratio (D/a) of the component (D) to the component (a) is preferably greater than or equal to 0.03 and less than or equal to 0.2, more preferably greater than or equal to 0.03 and less than or equal to 0.15, and even more preferably greater than or equal to 0.05 and less than or equal to 0.125.

The mass ratio (E/a) of component (E) to component (a) is preferably greater than or equal to 0.01 and less than or equal to 0.2, more preferably greater than or equal to 0.01 and less than or equal to 0.1, and even more preferably greater than or equal to 0.03 and less than or equal to 0.075.

Here, the content of the component (a) in the resin composition is preferably 50% by mass or more, more preferably 60% by mass or more, and even more preferably 70% by mass or more.

[ other Components ]

The resin composition of the present embodiment may include other components.

Examples of such other components include flame retardants, compatibilizers, antioxidants, mold release agents, light stabilizers, weather stabilizers, colorants, pigments, modifiers, drip retardants, antistatic agents, hydrolysis resistant agents, fillers and reinforcing agents (such as glass fibers, carbon fibers, talc, clay, mica, glass flakes, ground glass, glass beads, crystalline silica, alumina, silicon nitride, aluminum nitride, and boron nitride), and the like.

In addition, components (additives) such as an acid acceptor and a reactive trapping agent that prevent the release of acetic acid may be added as necessary. Examples of the acid acceptor include oxides such as magnesium oxide and aluminum oxide, etc.; metal hydroxides such as magnesium hydroxide, calcium hydroxide, aluminum hydroxide, hydrotalcite and the like; calcium carbonate; talc powder, and the like.

Examples of the reactive trapping agent include epoxy compounds, acid anhydride compounds, carbodiimides, and the like.

Ester compounds

Further, an ester compound may be included.

The ester compound is a compound having an ester group (-C (═ O) O-) and having a molecular weight of greater than or equal to 250 and less than or equal to 2,000 (preferably greater than or equal to 250 and less than or equal to 1,000, and more preferably greater than or equal to 250 and less than or equal to 600).

The ester compounds may be used alone or in combination of two or more.

It is to be noted that when two or more ester compounds are used in combination, ester compounds each having a molecular weight of 250 or more and 2,000 or less are used in combination.

Examples of the ester compound include fatty acid ester compounds, aromatic carboxylic acid ester compounds, and the like.

Among these, from the viewpoint of improving the transparency of the resin composition, a fatty acid ester compound is preferable as the ester compound.

Examples of the fatty acid ester compound include aliphatic monocarboxylic acid esters (acetate and the like), aliphatic dicarboxylic acid esters (succinate, adipate-containing compounds, azelate, sebacate, stearate and the like), aliphatic tricarboxylic acid esters (citrate, isocitrate and the like), ester-containing epoxidized compounds (epoxidized soybean oil, epoxidized linseed oil, epoxidized rapeseed oil fatty acid isobutyl ester or epoxidized fatty acid 2-ethylhexyl ester), fatty acid methyl esters, sucrose esters and the like.

Examples of the aromatic carboxylic acid ester compound include dimethyl phthalate, diethyl phthalate, di (2-ethylhexyl) phthalate, terephthalate, and the like.

Even among these, from the viewpoint of improving the transparency of the resin composition, aliphatic dicarboxylic acid esters and aliphatic tricarboxylic acid esters are preferable, adipate-containing compounds and citric acid esters are more preferable, and adipate-containing compounds are even more preferable.

The adipate-containing compound (including the compound of adipate) means a compound of adipate alone or a mixture of adipate and a component other than adipate (a compound other than adipate). However, the adipate-containing compound may include 50 mass% or more of adipate with respect to all components.

As an example of an adipate ester, an adipate diester is given. Specifically, as an example, an adipic acid diester represented by the following general formula (AE) and the like are given.

[ formula 8]

General formula (AE)

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](however, R^A1Represents an alkyl group, x represents an integer of 1 or more and 10 or less, and y represents an integer of 1 or more and 10 or less).

In the general formula (AE), R^AE1And R^AE2The alkyl group represented is preferably an alkyl group having 1 or more and 6 or less carbon atoms, and more preferably an alkyl group having 1 or more and 4 or less carbon atoms. R^AE1And R^AE2The alkyl group represented by (a) may be linear, branched or cyclic, but is preferably linear or branched.

In the general formula (AE), in R^AE1And R^AE2Polyoxyalkyl [ - (C) of_xH_2X-O)_y-R^A1]In, R^A1The alkyl group represented is preferably an alkyl group having 1 or more and 6 or less carbon atoms, and more preferably an alkyl group having 1 or more and 4 or less carbon atoms. R^A1The alkyl group represented by (a) may be linear, branched or cyclic, but is preferably linear or branched.

In the general formula (AE), the group represented by each reference numeral may be substituted with a substituent. As examples of the substituent, an alkyl group, an aryl group, a hydroxyl group and the like are given.

Meanwhile, as an example of the citric acid ester, an alkyl ester of citric acid having 1 or more and 12 or less carbon atoms (preferably 1 or more and 8 or less) is given. The citric acid ester may be a citric acid ester acylated with an alkylcarboxylic acid anhydride (for example, a linear or branched alkylcarboxylic acid anhydride having a carbon number of 2 or more and 6 or less (preferably 2 or more and 3 or less), such as acetic anhydride, propionic anhydride, butyric anhydride and valeric anhydride).

The content of each of these other components is preferably 0% by mass or more and 5% by mass or less with respect to the total amount of the resin composition. Here, "0 mass%" means that another component is not contained.

The resin composition of the present embodiment may contain another resin other than the above-described resins (cellulose acylate (a), polyester resin (B), cardanol composition (C), polymer (D), poly (meth) acrylate (E), and the like). However, when another resin is included, the content of the other resin is sufficient to be 5% by mass or less with respect to the total amount of the resin composition, and preferably less than 1% by mass. More preferably, the resin is not contained (in other words, 0 mass%).

Examples of the other resin include conventionally known thermoplastic resins, specifically polycarbonate resins; a polypropylene resin; a polyester resin; a polyolefin resin; a polyester carbonate resin; a polyphenylene ether resin; polyphenylene sulfide resin; polysulfone resin; polyether sulfone resin; a polyarylene resin; a polyetherimide resin; a polyacetal resin; polyvinyl acetal resins; a polyketone resin; a polyetherketone resin; polyether ether ketone resin; a polyaryl ketone resin; a polyether nitrile resin; a liquid crystal resin; a polybenzimidazole resin; a polyaspartic acid resin; a vinyl-based polymer or copolymer obtained by polymerizing or copolymerizing one or more vinyl monomers selected from the group consisting of aromatic alkenyl compounds, methacrylates, acrylates, and vinyl cyanide compounds; a diene-aromatic alkenyl compound copolymer; vinyl cyanide-diene-aromatic alkenyl compound copolymers; an aromatic alkenyl compound-diene-vinyl cyanide-N-phenyl maleimide copolymer; vinyl cyanide- (ethylene-propylene-diene (EPDM)) -aromatic alkenyl compound copolymers; vinyl chloride resin; chlorinated vinyl chloride resins, and the like. These resins may be used alone or in combination of two or more.

[ method for producing resin composition ]

The resin composition of the present embodiment is produced by melt-kneading a mixture including, for example, the cellulose acylate (a), the polyester resin (B), and the cardanol composition (C), and other components and the like as necessary. Further, the resin composition of the present embodiment is also produced by, for example, dissolving each component in a solvent.

Examples of the means for melt-kneading include known means, and specific examples thereof include a twin-screw extruder, a Henschel mixer, a Banbury mixer, a single-screw extruder, a multi-screw extruder, and a ko-kneader.

< resin molded article >

The resin molded article of the present embodiment includes the resin composition of the present embodiment. In other words, the resin molded body of the present embodiment is composed of the same composition as the resin composition of the present embodiment.

The method of molding the resin molded body of the present embodiment is preferably injection molding from the viewpoint of having a high degree of freedom in shape. From this viewpoint, the resin molded body is preferably an injection molded body obtained by injection molding.

The barrel temperature of the injection molding is, for example, 160 ℃ or more and 280 ℃ or less, and preferably 180 ℃ or more and 240 ℃ or less. The mold temperature for injection molding is, for example, 40 ℃ or more and 90 ℃ or less, and more preferably 40 ℃ or more and 60 ℃ or less.

Injection molding was performed using commercial devices such as, for example, Nissei Plastic Industrial co., NEX500 manufactured by ltd, Nissei Plastic Industrial co., NEX150 manufactured by ltd, Nissei Plastic Industrial co, NEX70000 manufactured by ltd, Nissei Plastic Industrial co, PNX40 manufactured by ltd, and SE50D manufactured by sumitomo industries, ltd.

The molding method for obtaining the resin molded body of the present embodiment is not limited to the above injection molding, and examples that can be applied include extrusion molding, blow molding, hot press molding, calendar molding, coat molding, cast molding, dip molding, vacuum molding, transfer molding, and the like.

The resin molded article of the present embodiment is suitably used for electronic and electrical equipment, office equipment, household electrical appliances, automotive interior materials, toys, containers, and the like. More specifically, housings for electrical and electronic appliances and household appliances; various components of electric and electronic appliances and household appliances; automotive upholstery, block assembly toys; a plastic mold kit; storage cases for CD-ROMs, DVDs, etc.; tableware; beverage bottles; a food tray; a wrapping material; a film; sheets, and the like.