阅读说明：本技术 聚缩醛树脂组合物和聚缩醛树脂组合物的制造方法 (Polyacetal resin composition and method for producing polyacetal resin composition ) 是由 喜来直裕 增田荣次 于 2020-04-10 设计创作，主要内容包括：本发明的目的在于,提供：改善了机械物性的水平的聚缩醛树脂组合物。一种聚缩醛树脂组合物,其通过相对于聚缩醛树脂(A)100质量份混合聚缩醛共聚物(B)0.1～100质量份而得到的,所述聚缩醛共聚物(B)是至少使三氧杂环己烷(a)、在环内具有碳数2以上的氧亚烷基的环状缩醛化合物(b)和有机聚硅氧烷(c)进行聚合反应而得到的,该有机聚硅氧烷(c)为选自下述式(1)所示的化合物中的1种以上的硅烷化合物的缩合物、且为具有烷氧基的化合物。R～(1)-(n)Si(OR～(2))-(4-n)(1)(式(1)中R～(1)表示1价烃基,R～(2)表示碳数4以下的烷基。n为0～3的整数)。(An object of the present invention is to provide: a polyacetal resin composition having improved mechanical properties. A polyacetal resin composition obtained by mixing 0.1 to 100 parts by mass of a polyacetal copolymer (B) obtained by polymerizing at least trioxane (a), a cyclic acetal compound (B) having an oxyalkylene group having at least 2 carbon atoms in the ring, and an organopolysiloxane (c) which is a condensate of 1 or more silane compounds selected from the compounds represented by the following formula (1) and has an alkoxy group, with respect to 100 parts by mass of a polyacetal resin (A). R 1 n Si(OR 2 ) 4‑n (1) (R in the formula (1)) 1 Represents a 1-valent hydrocarbon group, R 2 Represents an alkyl group having 4 or less carbon atoms. n is an integer of 0 to 3).)

1. A polyacetal resin composition obtained by mixing 0.1 to 100 parts by mass of a polyacetal copolymer (B) with 100 parts by mass of a polyacetal resin (A),

the polyacetal copolymer (B) is obtained by at least polymerizing trioxane (a), a cyclic acetal compound (B) having an oxyalkylene group having at least 2 carbon atoms in the ring, and organopolysiloxane (c),

the organopolysiloxane (c) is a condensate of 1 or more silane compounds selected from the compounds represented by the following formula (1) and is a compound having an alkoxy group,

R¹ _nSi(OR²)_4-n (1)

r in the formula (1)¹Represents a 1-valent hydrocarbon group, R²Represents an alkyl group having 4 or less carbon atoms, and n is an integer of 0 to 3.

2. The polyacetal resin composition according to claim 1, wherein R in the formula (1)²Is at least 1 selected from methyl and ethyl.

3. The polyacetal resin composition according to claim 1 or 2, wherein R in the formula (1)¹Is at least 1 selected from methyl or phenyl.

4. The polyacetal resin composition according to any one of claims 1 to 3, wherein the polyacetal resin (A) is an acetal copolymer.

5. A method for producing a polyacetal resin composition, which comprises mixing a polyacetal copolymer (B) in an amount of 0.1 to 100 parts by mass per 100 parts by mass of a polyacetal resin (A),

the polyacetal copolymer (B) is obtained by polymerizing at least trioxane (a), a cyclic acetal compound (B) having an oxyalkylene group having at least 2 carbon atoms in the ring, and an organopolysiloxane (c) in the presence of a cationic polymerization catalyst,

the organopolysiloxane (c) is a condensate of 1 or more silane compounds selected from the compounds represented by the following formula (1) and is a compound having an alkoxy group,

R¹ _nSi(OR²)_4-n (1)

r in the formula (1)¹Represents a 1-valent hydrocarbon group, R²Represents an alkyl group having 4 or less carbon atoms, and n is an integer of 0 to 3.

Technical Field

The present invention relates to a polyacetal resin composition having excellent mechanical properties and a method for producing the polyacetal resin composition.

Background

Polyacetal resins have excellent properties in terms of mechanical properties, thermal properties, electrical properties, slidability, moldability and the like, and are widely used mainly as structural materials, mechanical parts and the like for electrical equipment, automobile parts, precision machine parts and the like. However, as the field of application of polyacetal resins has expanded, the required properties have tended to be increasingly higher, more complex and more specialized. As such required properties, further improvement in rigidity and suppression of formaldehyde generation while maintaining excellent sliding properties and appearance inherent in polyacetal resins is required.

On the other hand, for the purpose of improving the rigidity, a method of filling a fibrous filler or the like into a polyacetal resin is generally used, but this method has problems such as poor appearance of a molded article, reduction in sliding characteristics, and the like due to filling of the fibrous filler or the like, and further has a problem of reduction in toughness.

Further, it is known that the rigidity of the polyacetal copolymer is improved without substantially impairing the slidability and the appearance by reducing the amount of the comonomer, but the method of reducing the comonomer causes problems such as not only a decrease in toughness but also a decrease in thermal stability of the polymer, and thus the method is not always satisfactory.

Further, an attempt has been made to improve the rigidity of a polyacetal copolymer into which a branched structure is incorporated (patent document 1), but when a polyacetal copolymer into which a branched structure is incorporated is polymerized, the initiation of polymerization may be delayed and the polymerization may suddenly and explosively occur depending on the kind of a comonomer in the case where a cationic polymerization catalyst, particularly a protonic acid, is used as a polymerization catalyst, and there is a problem in terms of production stability.

For example, as for the polyacetal copolymer, a copolymer obtained by copolymerizing trioxane with a compound having 2 or more glycidyl ether groups in 1 molecule has been proposed (patent document 2). However, when a compound having a plurality of epoxy groups represented by glycidyl ether groups and ether oxygen groups as functional groups is used in polymerization, there remains a problem in polymerization stability. In particular, when a protonic acid is used as a polymerization catalyst, polymerization does not occur at a low catalyst amount, and when the catalyst amount is increased, a phenomenon occurs in which a sharp polymerization reaction suddenly occurs after an irregular induction period, and it is difficult to control the polymerization.

Documents of the prior art

Patent document

Patent document 1: japanese examined patent publication No. 55-019942

Patent document 2: japanese laid-open patent application No. 2001-163944

Disclosure of Invention

Problems to be solved by the invention

An object of the present invention is to provide: a polyacetal resin composition having improved mechanical properties and a method for producing the polyacetal resin composition.

Means for solving the problems

The present inventors have conducted intensive studies to achieve the above object, and as a result, have found that: a polyacetal resin is used as a matrix, and a polyacetal copolymer is compounded in the matrix, wherein the polyacetal copolymer is obtained by polymerization reaction of trioxane, a cyclic acetal compound having an oxyalkylene group with a carbon number of more than 2 in a ring, a condensate of specific 1 or more silane compounds and an organopolysiloxane with an alkoxy group, thereby realizing unexpected improvement of mechanical properties, and the following invention is completed.

1. A polyacetal resin composition obtained by mixing 0.1 to 100 parts by mass of a polyacetal copolymer (B) with 100 parts by mass of a polyacetal resin (A),

the polyacetal copolymer (B) is obtained by at least polymerizing trioxane (a), a cyclic acetal compound (B) having an oxyalkylene group having at least 2 carbon atoms in the ring, and organopolysiloxane (c),

the organopolysiloxane (c) is a condensate of 1 or more silane compounds selected from compounds represented by the following formula (1), and is a compound having an alkoxy group.

R¹ _nSi(OR²)_4-n (1)

(R in the formula (1))¹Represents a 1-valent hydrocarbon group, R²Represents an alkyl group having 4 or less carbon atoms. n is an integer of 0 to 3. )

2. The polyacetal resin composition according to 1, wherein R in the formula (1)²Is at least 1 selected from methyl and ethyl.

3. The polyacetal resin composition according to 1 or 2, wherein R in the formula (1)¹Is at least 1 selected from methyl or phenyl.

4. The polyacetal resin composition according to any one of 1 to 3, wherein the polyacetal resin (A) is an acetal copolymer.

5. A method for producing a polyacetal resin composition, which comprises mixing a polyacetal copolymer (B) in an amount of 0.1 to 100 parts by mass per 100 parts by mass of a polyacetal resin (A),

the polyacetal copolymer (B) is obtained by polymerizing at least trioxane (a), a cyclic acetal compound (B) having an oxyalkylene group having at least 2 carbon atoms in the ring, and an organopolysiloxane (c) in the presence of a cationic polymerization catalyst,

the organopolysiloxane (c) is a condensate of 1 or more silane compounds selected from compounds represented by the following formula (1), and is a compound having an alkoxy group.

R¹ _nSi(OR²)_4-n (1)

(R in the formula (1))¹Represents a 1-valent hydrocarbon group, R²Represents an alkyl group having 4 or less carbon atoms. n is an integer of 0 to 3. )

ADVANTAGEOUS EFFECTS OF INVENTION

According to the present invention, there can be provided: a polyacetal resin composition having improved mechanical properties and a method for producing the polyacetal resin composition.

Detailed Description

The present invention is not limited to the following embodiments, and can be carried out with appropriate modifications within the intended scope of the present invention.

< polyacetal resin composition >

The polyacetal resin composition of the present invention is characterized by comprising a polyacetal resin (a) and a polyacetal copolymer (B) obtained by polymerizing at least trioxane (a), a cyclic acetal compound (B) having an oxyalkylene group having at least 2 carbon atoms in the ring, and a specific condensate of 1 or more silane compounds and an organopolysiloxane (c) having an alkoxy group, wherein the amount of the polyacetal copolymer (B) to be blended is 0.1 to 100 parts by mass, preferably 0.5 to 100 parts by mass, based on 100 parts by mass of the polyacetal resin (a).

< polyacetal resin (A) >)

The configuration of the polyacetal resin composition of the present invention will be described in detail below.

The polyacetal resin (A) as the base of the resin composition of the present invention is a resin comprising oxymethylene units (-CH)₂O-) is a main structural unit, comprising: acetal homopolymers (e.g., DuPont, USA, trade name "Delrin", etc.), and acetal copolymers containing comonomer units in addition to oxymethylene units (e.g., polyplasics co., ltd., trade name "Duracon", etc.).

In the acetal copolymer, the comonomer units include: an oxyalkylene unit having about 2 to 6 carbon atoms (preferably about 2 to 4 carbon atoms) (e.g., oxyethylene group (-CH)₂CH₂O-), oxypropylene, oxytetramethylene, etc.).

The content of the comonomer unit may be selected from the range of usually 0.01 to 20 mol%, preferably 0.03 to 10 mol%, and more preferably about 0.1 to 7 mol% in an amount not significantly impairing the crystallinity and chemical stability of the resin, for example, a ratio of the comonomer unit in the structural unit of the polyacetal polymer.

The acetal copolymer may be a copolymer composed of two components, a terpolymer composed of three components, or the like. The acetal copolymer may be a block copolymer, a graft copolymer, or the like, in addition to the random copolymer.

The polymerization degree, branching degree and crosslinking degree of the polyacetal resin (a) are not particularly limited, and may be any as long as they can be melt-molded. The polyacetal resin (a) blended in the present invention is particularly preferably an acetal copolymer in terms of its thermal stability and the like.

< polyacetal copolymer (B) >)

The polyacetal copolymer (B) of the present invention is a polyacetal copolymer obtained by polymerizing at least trioxane (a), a cyclic acetal compound (B) having an oxyalkylene group having at least 2 carbon atoms in the ring, and an organopolysiloxane (c), wherein the organopolysiloxane (c) is a condensate of at least 1 or more silane compounds selected from the compounds represented by the following formula (1), and is a compound having an alkoxy group.

R¹ _nSi(OR²)_4-n (1)

(R in the formula (1))¹Represents a 1-valent hydrocarbon group, R²Represents an alkyl group having 4 or less carbon atoms. n is an integer of 0 to 3. )

Trioxane (a)

Trioxane (a) used in the present invention is a cyclic trimer of formaldehyde, and is usually obtained by reacting an aqueous formaldehyde solution in the presence of an acidic catalyst, and is purified by a method such as distillation.

Cyclic acetal compound (b) having oxyalkylene group having 2 or more carbon atoms in the ring

In the present invention, a cyclic acetal compound (b) having an oxyalkylene group having 2 or more carbon atoms in the ring can be used as a comonomer.

The cyclic acetal compound having an oxyalkylene group having 2 or more carbon atoms in the ring according to the present invention means: specific examples of the compound generally used as a comonomer in the production of the polyacetal copolymer include 1, 3-dioxolane, 1,3, 6-trioxane, 1, 4-butanediol formal, and the like.

In the present invention, the component (b) is preferably used in an amount within a range of 0.01 to 20 parts by mass, more preferably 0.05 to 5 parts by mass, based on 100 parts by mass of trioxane.

Organopolysiloxane (c) having alkoxy groups, obtained by condensing at least 1 silane compound selected from silane compounds represented by formula (1)

R¹ _nSi(OR²)_4-n (1)

(R in the formula (1))¹Represents a 1-valent hydrocarbon group, R²Represents an alkyl group having 4 or less carbon atoms. n is an integer of 0 to 3. )

Examples of the silane compound represented by the formula (1) include phenyltrimethoxysilane, methyltrimethoxysilane, methyltriethoxysilane, methyltripropoxysilane, methyltributoxysilane, ethyltrimethoxysilane, ethyltriethoxysilane, tetramethoxysilane, tetraethoxysilane, tetrapropoxysilane, tetrabutoxysilane, methylphenyldimethoxysilane, trimethylmethoxysilane, trimethylethoxysilane, dimethyldimethoxysilane, dimethyldiethoxysilane, diphenyldimethoxysilane, and diphenyldiethoxysilane.

The organopolysiloxane (c) of the present invention can be obtained by condensing 1 or more silane compounds selected from the silane compounds represented by formula (1) with a known condensation reaction catalyst, specifically, an acid catalyst, a base catalyst, an organometallic compound catalyst, and the like.

Specifically, for example, the (alkoxy) silane compound is partially hydrolytically condensed by the method described in japanese patent No. 2904317 and japanese patent No. 3389338, and the alkoxy group is contained to such an extent that the effect of the present invention is produced.

The organopolysiloxane (c) of the present invention has an alkoxy group, which can be determined by quantifying the alkoxy group in the organopolysiloxane. For example, can be made of²⁹Si-NMR measurement, additionThe amount of alcohol produced when KOH was thermally decomposed was quantified.

The organopolysiloxane (c) of the present invention is a compound having a siloxane skeleton and containing an alkoxy group and, optionally, a hydrocarbon group. Specific examples of the alkoxy group include methoxy, ethoxy, propoxy and butoxy.

Specific examples of the hydrocarbon group include saturated hydrocarbon groups such as methyl group, ethyl group, and propyl group, and aromatic hydrocarbon groups such as phenyl group and naphthyl group.

R in the formula (1) relating to the organopolysiloxane (c) of the present invention is R in the present invention from the viewpoint of the mechanical properties of the obtained polyacetal resin composition²Preferably at least 1 selected from methyl and ethyl.

In addition, from the viewpoint of the mechanical properties of the polyacetal resin composition to be obtained, R in the formula (1) relating to the organopolysiloxane (c)¹Preferably at least one selected from methyl or phenyl.

Examples of commercially available products of the organopolysiloxane (c) of the present invention include "SR 2402 Resin", "AY 42-163", "DC-3074 interlayer", and "DC-3037 interlayer" (manufactured by Dow Toray Co., Ltd., "KC-89S", "KR-500", "X-40-9225", "X-40-9246", "X-40-9250", "KR-9218", "KR-213", "KR-510", "X-40-9227", "X-40-9247", and "KR-401N" (manufactured by shin-Etsu chemical Co., Ltd.).

In the present invention, it is considered that the component (c) functions as a chain transfer agent in the polymerization reaction. As a result, it is considered that when the polymerization reaction of the trioxane (a), the cyclic acetal compound (b) having an oxyalkylene group having 2 or more carbon atoms in the ring, and the organosiloxane (c) is carried out, the control of the polymerization becomes easy, and the productivity is improved. It can be considered that: the obtained polyacetal copolymer (B) improves the crystallinity of the resin composition, thereby improving the mechanical properties of the resin composition.

In the present invention, the component (c) is preferably used in an amount within a range of 0.01 to 5 parts by mass, more preferably 0.03 to 1 part by mass, based on 100 parts by mass of the trioxane (a).

< method for polymerizing polyacetal copolymer (B) >

The method for polymerizing the polyacetal copolymer (B) of the present invention is characterized by polymerizing at least trioxane (a), a cyclic acetal compound (B) having an oxyalkylene group having 2 or more carbon atoms in the ring, and an organopolysiloxane (c) in the presence of a cationic polymerization catalyst.

The organopolysiloxane (c) is characterized by being a condensate of 1 or more silane compounds selected from the compounds represented by the following formula (1).

R¹ _nSi(OR²)_4-n (1)

(R in the formula (1))¹Represents a 1-valent hydrocarbon group, R²Represents an alkyl group having 4 or less carbon atoms. n is an integer of 0 to 3. )

< cationic polymerization catalyst >

As the cationic polymerization catalyst, a polymerization catalyst known for cationic copolymerization using trioxane as a main monomer can be used. Typically, Lewis acids and protonic acids are mentioned. Particularly preferred are protonic acids shown below.

Proton acid

Examples of the protonic acid include perfluoroalkanesulfonic acid, heteropoly acid, and isopoly acid.

Specific examples of perfluoroalkanesulfonic acids include trifluoromethanesulfonic acid, pentafluoroethanesulfonic acid, heptafluoropropanesulfonic acid, nonafluorobutanesulfonic acid, undecafluoropentanesulfonic acid, tridecafluorohexanesulfonic acid, pentadecafluoroheptanesulfonic acid, and heptadecafluorooctanesulfonic acid.

The heteropoly acid is a polyacid produced by dehydration condensation of various kinds of oxo acids, and has a single-core or multi-core complex ion in which a specific different element is present in the center and an oxygen atom is shared to enable condensation of a condensed acid group. Isopoly acids, also known as isopoly acids, homonuclear condensation acids, isopoly acids, refer to high molecular weight inorganic oxoacids formed from the condensation of inorganic oxoacids of a single type of metal having a valence of V or VI.

Specific examples of the heteropoly-acid include phosphomolybdic acid, phosphotungstic acid, phosphomolybdotungstic acid, phosphomolybdovanadic acid, phosphomolybdotungstovanadic acid, phosphotungstovanadic acid, silicotungstic acid, silicomolybdic acid, silicomolybdotungstic acid, silicomolybdotungstovanadic acid, and the like. In particular, from the viewpoint of polymerization activity, the heteropoly-acid is preferably selected from the group consisting of silicomolybdic acid, silicotungstic acid, phosphomolybdic acid, and phosphotungstic acid.

Specific examples of the isopoly acid include tungsten isopoly acids exemplified by paratungstic acid, metatungstic acid, and the like; molybdenum isopolyacids exemplified by paramolybdic acid, metamolybdic acid, and the like; metavanadate, vanadium isopoly acid, and the like. Among them, tungsten isopoly acid is preferable from the viewpoint of polymerization activity.

Lewis acid

Examples of the lewis acid include halides of boron, tin, titanium, phosphorus, arsenic and antimony, and specifically, boron trifluoride, tin tetrachloride, titanium tetrachloride, phosphorus pentafluoride, phosphorus pentachloride, antimony pentafluoride, and complexes or salts thereof.

The amount of the polymerization catalyst is not particularly limited, but is preferably 0.1ppm to 50ppm, more preferably 0.1ppm to 30ppm, based on the total amount of all monomers. Particularly preferably 0.1ppm to 10 ppm. (hereinafter, ppm in the unit is all based on mass.)

The method for polymerizing the polyacetal copolymer of the present invention is not particularly limited. In the production, the polymerization apparatus is not particularly limited, and any method such as a batch method or a continuous method can be used. Further, the polymerization temperature is preferably maintained at 65 ℃ or higher and 135 ℃ or lower.

The cationic polymerization catalyst is preferably used by diluting with an inactive solvent which does not affect the polymerization.

The deactivation of the polymerization catalyst after the polymerization can be carried out by a conventionally known method. For example, the polymerization may be carried out by adding a basic compound or an aqueous solution thereof to the reaction product discharged from the polymerization reactor or the reaction product in the polymerization reactor after the polymerization reaction.

The basic compound used for neutralizing and deactivating the polymerization catalyst is not particularly limited. After polymerization and deactivation, washing, separation and recovery of unreacted monomers, drying, and the like are further performed by a conventionally known method as needed.

The weight average molecular weight (in terms of polymethyl methacrylate measured by size exclusion chromatography) of the polyacetal copolymer (B) obtained as described above is preferably 10000 to 500000, and particularly preferably 20000 to 150000. In addition, for the terminal groups, from¹The amount of the terminal group of the hemiformal to be detected by H-NMR (for example, according to the method described in Japanese patent application laid-open No. 2001-11143) is preferably 0 to 4mmol/kg, and particularly preferably 0 to 2 mmol/kg.

In order to control the hemiformal end group content within the above range, impurities, particularly water, in the total amount of monomers and comonomers to be polymerized are preferably 20ppm or less, and particularly preferably 10ppm or less.

< other ingredients >

As described above, the resin composition of the present invention is preferably blended with various stabilizers selected as needed. The stabilizer used here may be any one of 1 or 2 or more of hindered phenol compounds, nitrogen-containing compounds, hydroxides, inorganic salts, and carboxylates of alkali or alkaline earth metals.

Further, if necessary, 1 or 2 or more kinds of general additives for thermoplastic resins, for example, weather (light) -resistant stabilizers, colorants such as dyes and pigments, lubricants, nucleating agents, release agents, antistatic agents, surfactants, organic polymer materials, inorganic or organic fibrous, powdery, and plate-like fillers, may be added as long as the present invention is not hindered.

< method for producing polyacetal resin composition >

In the production of the polyacetal resin composition of the present invention, a melt-kneading apparatus is used. The melt-kneading apparatus is not particularly limited, and has a function of melting and kneading the polyacetal resin and the polyacetal copolymer, and preferably has a function of exhausting gas, and examples thereof include a single-screw or multi-screw continuous extrusion kneader having at least 1 exhaust hole, a kneader, and the like. The melt-kneading treatment is preferably carried out at a temperature in the range of 260 ℃ or higher than the melting point of the polyacetal resin and the polyacetal copolymer. If it is higher than 260 ℃, decomposition deterioration of the polymer occurs, which is not preferable.

Examples

The present invention will be specifically described below with reference to examples, but the present invention is not limited to these examples.

The polyacetal resins (a) and polyacetal copolymers (B) used in the examples and comparative examples are as follows.

< polyacetal resin (A) >)

The polyacetal resin was prepared as follows.

In a twin-screw paddle type continuous polymerization machine, a mixture of Trioxane (TOX) 96.7% by mass, 1, 3-Dioxolane (DO) 3.3% by mass and methylal 800ppm was continuously fed, and boron trifluoride 20ppm as a catalyst was added to carry out polymerization.

The polymer discharged from the outlet of the polymerizer was immediately added with an aqueous solution containing 1000ppm of triethylamine, and the mixture was pulverized and stirred to deactivate the catalyst. Subsequently, the polymer was recovered by centrifugal separation and dried to obtain a polyacetal resin.

< polyacetal copolymer (B) >)

The polyacetal copolymer (B) was prepared as follows.

300g of trioxane (a) was placed in a closed autoclave having a jacket and a stirring blade through which a heat medium was allowed to flow, and the compounds shown in Table 1 as the component (b) and the component (c) were further added so as to be in the mass parts shown in Table 1. These contents were stirred, hot water at 80 ℃ was passed through the jacket, and after maintaining the internal temperature at about 80 ℃, phosphotungstic acid (PWA) was added as a catalyst in the form of a methyl formate solution at 4.5ppm relative to the sum of the masses of (a) and (b) or trifluoromethanesulfonic acid (TfOH) was added as a cyclohexane solution at 1.0ppm relative to the sum of the masses of (a) and (b), thereby carrying out polymerization. Example 10 use TfOH in addition to PWA.

The component (b) used in the examples was (b-1)1, 3-Dioxolane (DO), (b-2)1, 4-butanediol formal (BDF), and the component (c-1) KR-500 (R)¹: methyl, R²: methyl group), (c-2) KR-401N (R)¹: methyl/phenyl, R²: methyl) (all manufactured by shin Etsu chemical Co., Ltd.).

After 5 minutes, 300g of water containing 1000ppm of triethylamine was added to the autoclave to stop the reaction, and the contents were taken out and pulverized to 200 mesh or less. Subsequently, the polyacetal copolymer (B) was washed with acetone and dried to obtain a polyacetal copolymer (B). The components of the examples and comparative examples are shown in table 1.

For comparison, the following diglycidyl compounds (X-1 and X-2) were used in place of the component (c) of the present invention for polymerization to obtain a comparative polyacetal copolymer.

X-1: butanediol diglycidyl ether

X-2: trimethylolpropane triglycidyl ether

< examples and comparative examples >

The respective components shown in table 1 were mixed in the amounts shown in table 1 with respect to 100 parts by mass of the polyacetal resin (a), and melt-kneaded in a vented twin-screw extruder to prepare a pellet-shaped composition.

In addition, 0.35 parts by mass of ethylene bis (oxyethylene) bis [3- (5-tert-butyl-4-hydroxy-m-tolyl) propionate ] (manufactured by IRGANOX245 BASF CORPORATION) and 0.08 parts by mass of melamine were added to 100 parts by mass of the total amount of the component (a) and the component (B) during melt kneading of all the samples.

In comparative examples 2 and 3, no polymerization reaction was observed under the conditions shown in Table 1 for the polyacetal copolymer (B) even under other polymerization conditions similar to those in the examples.

[ Table 1]

< evaluation >

The characteristic evaluation items and evaluation methods in the examples are as follows. The results are shown in Table 2.

[ tensile test ]

The Tensile Strength (TS) of the ISOType1A test pieces was measured according to ISO527-1, 2. The measuring chamber was kept in an atmosphere of 50% RH at 23 ℃.

[ bending test ]

The Flexural Modulus (FM) according to ISO178 was measured as the mechanical properties. The conditions in the measurement chamber were set at 23 ℃ and 55% RH.

[ Table 2]

As is clear from the evaluation of mechanical properties in table 2, the resin composition of the present invention is excellent in mechanical properties (tensile strength and flexural modulus).