JPH02209938A - Resin composition - Google Patents

Abstract

PURPOSE:To obtain the subject composition having improved affinity and dispersibility and excellent appearance, free from lamellar peeling and useful for heat-resistant parts of automobile, etc., by using a modifying agent consisting of a styrene copolymer copolymerized with a vinyl compound containing ethylene group. CONSTITUTION:The objective composition is produced by compounding (A) 100 pts.wt. of a polymer mixture consisting of (A1) 5-95wt.% of a styrene polymer having mainly syndiotactic structure and (A2) 95-5wt.% of a thermoplastic resin containing at least one kind of polar group selected from carboxyl group, hydroxyl group and amino group on the terminal with (B) 0.01-15 pts.wt. of a styrene copolymer copolymerized with a vinyl compound containing epoxy group or a styrene copolymer copolymerized with an alpha,beta-unsaturated carboxylic acid anhydride. Preferably, the component B contains 0.01-30mol% of copolymerized vinyl compound having epoxy group and has a weight-average molecular weight of 10,000-800,000.

Description

[Detailed description of the invention] [Industrial application field] TECHNICAL FIELD The present invention relates to a resin composition, and specifically to automobiles.

The present invention relates to styrenic resin compositions useful for heat-resistant parts in home appliances, electrical and electronic equipment, and industrial heat-resistant structural materials.

[Problems to be solved by conventional techniques and inventions] In recent years,
A styrenic polymer with high syndiotacticity,
Syndiotactic polymers are superior in mechanical strength, heat resistance, solvent resistance, and electrical properties compared to styrene-based polymers with an atactic structure. Various studies have been made to incorporate styrenic polymers having a structure. For example, JP-A No. 62-257950 discloses blending polystyrene having a syndiotactic structure for the purpose of improving the heat resistance of a thermoplastic resin. Although this formulation certainly improves the heat resistance of thermoplastic resins, in compositions with resins that have poor affinity with polystyrene, tensile strength, elongation, etc. are significantly reduced, and depending on the application, this In some cases, this is undesirable due to the deterioration of mechanical properties. Furthermore, in addition to the deterioration of these mechanical properties, there were also problems in appearance, such as peeling of the surface layer of the molded product.

In order to solve these problems, patent application No. 63-384
In Specification No. 4, the research group of the present inventors discovered that when blending a styrenic polymer with a syndiotactic structure and a thermoplastic resin with poor affinity, a specific block copolymer was We proposed a technique in which it is added as a dispersibility improver. For example, when blending with polyamide, a polystyrene-polyamide block copolymer is added, and when blending with polybutylene terephthalate, a polystyrene-polybutylene terephthalate block copolymer is added. That is, this technique essentially involves adding a block copolymer of polystyrene and a partner resin to be blended as a modifier;
Compared to the technology described in the publication, a certain degree of modification effect has been achieved, and in particular, the mechanical properties have been greatly improved.

However, with this technology, it is necessary to prepare the block copolymer in advance to prepare the blend, which requires a complicated process and may be a disadvantageous hindrance to industrial production. Ta.

Therefore, in blending a styrenic polymer having a syndiotactic structure and a thermoplastic resin with poor affinity, the present inventors have developed a modifier that can be industrially mass-produced or a modifier that can be mass-produced. We have conducted extensive research to improve the affinity and dispersibility of thermoplastic resins by incorporating specific modifiers.

[Means to solve the problem]

As a result, vinyl compounds with epoxy groups or α
It was discovered that a styrenic copolymer copolymerized with a β-unsaturated carboxylic acid anhydride is a modifier that achieves the above-mentioned problems. The present invention was completed based on this knowledge.

That is, the present invention comprises (a) 5 to 95% by weight of a styrenic polymer mainly having a syndiotactic structure; and (b)
Thermoplastic resin containing at least one polar group selected from carboxyl group, hydroxyl group and amino group at the terminal 95~
For 100 parts by weight of a polymer mixture consisting of 5% by weight (
c) A resin containing 0.01 to 15 parts by weight of a styrene copolymer copolymerized with a vinyl compound containing an epoxy group or a styrene copolymer copolymerized with an α5 β-unsaturated carboxylic acid anhydride. A composition is provided.

As mentioned above, the resin composition of the present invention comprises component (a), (
The main components are component b) and component (c). Here, component (a) is a styrenic polymer that mainly has a syndiotactic structure. It has a three-dimensional structure in which phenyl groups and substituted phenyl groups, which are side chains, are located alternately in opposite directions to the main chain formed from carbon bonds, and its toughness is determined by nuclear magnetic resonance due to isotopic carbon. The toughness measured by the 13C-NMR method is determined by the proportion of consecutive constituent units, e.g. 2 in the case of diats, 3 in the case of 3. is triat, 5
However, in the present invention, the styrenic polymer mainly having a syndiotactic structure is usually 75% or more diad,
Polystyrene, poly(alkylstyrene) having a syndiotacticity of preferably 85% or more, or 30% or more in terms of pentads (racemic pentads), preferably 50% or more.

Refers to poly(halogenated styrene), poly(alkoxystyrene), poly(vinylbenzoic acid ester), mixtures thereof, or copolymers having these as main components. Note that poly(alkylstyrene) here includes poly(methylstyrene), poly(ethylstyrene),
There are poly(isopropylstyrene) and poly(tert-butylstyrene), and examples of poly(halogenated styrene) include poly(chlorostyrene) and poly(bromostyrene).

Examples include poly(fluorostyrene). Furthermore, examples of poly(alkoxystyrene) include poly(methoxystyrene) and poly(ethoxystyrene). Among these, particularly preferred styrenic polymers include polystyrene, poly(p-methylstyrene), poly(m-methylstyrene), poly(pter t-butylstyrene), poly(p-chlorostyrene), poly(m-methylstyrene), -chlorostyrene), poly(p-fluorostyrene), and copolymers of styrene and p-methylstyrene.

Furthermore, the molecular weight of the styrenic polymer used in the present invention as the component (a) is not limited, but it preferably has a weight average molecular weight of 10.000 or more, particularly 5.
A value of 0,000 or more is optimal. Further, there is no restriction on the width or narrowness of the molecular weight distribution, and various types can be used. Such styrenic polymers having a mainly syndiotactic structure can be produced by using a titanium compound and a condensation product of water and trialkylaluminum as catalysts, for example, in an inert hydrocarbon solvent or in the absence of a solvent. It can be produced by polymerizing monomers (monomers corresponding to the above-mentioned styrene polymers) (Japanese Unexamined Patent Publication No. 187708/1983).

On the other hand, as mentioned above, component (b) of the present invention is a thermoplastic resin containing a small number (all one kind) of a polar group selected from a carboxyl group, a hydroxyl group, and an amino group at the terminal. Examples include polyethylene terephthalate, polypropylene terephthalate, polybutylene terephthalate, polycyclohexane dimethylene terephthalate, polyoxyethoxybenzoate, polyethylene naphthalate, and the above polyester components and other acid components and/or glycol components, such as isophthalic acid, p- Acid components such as oxybenzoic acid, adipic acid, sebacic acid, geltaric acid, diphenylmethanedicarboxylic acid, dimer acid, hexamethylene glycol, diethylene glycol, neopentyl glycol, bisphenol A.

Polyester copolymerized with a glycol component such as neopentyl glycol alkylene oxide adduct, aromatic polyester-polyether block copolymer, aromatic polyester-polylactone block copolymer, polyester in a broad sense such as polyarylate, nylon 6 , nylon 6.6. Nylon 6/9. Nylon 5/10. Nylon 6/12, nylon 6/6/6. Polyxylylene adipamide, polyhexamethylene terephthalamide, polyphenylene phthalamide, polyxylylene adipamide/hexamethylene adipamide, polyester amide elastomer, polyether amide elastomer, polyether ester amide elastomer, dimer acid co- Mention may be made of polyamides such as polymeric amides. Among these, particularly preferred polyesters include polyethylene terephthalate (PET) and polybutylene terephthalate (polybutylene terephthalate).
(PBT), and the polyarylate is commonly known as U-polymer whose constituent components are bisphenol A and terephthalic acid.1. The polyamide is nylon 6° or nylon 6.6.

The composition of the present invention further includes, as component (c), a styrenic copolymer copolymerized with a vinyl compound containing an epoxy group or a styrenic copolymer copolymerized with an α,β-unsaturated carboxylic acid anhydride. including.

These styrenic copolymers have a weight average molecular weight of 10,000 to 800,000, preferably 5
0.000 to 500,000 is used. When the weight average molecular weight is less than 10,000, the effect of improving dispersibility is small, and on the contrary, the mechanical properties are deteriorated. In addition, if the weight average molecular weight exceeds soo or ooo, the viscosity of the composition will increase, the moldability will decrease, or an independent phase will be formed in the composition, resulting in a modification of the affinity and dispersibility. It may lose its effectiveness.

In producing a styrene-based copolymer obtained by copolymerizing a vinyl compound containing an epoxy group, examples of the vinyl compound containing an epoxy group to be copolymerized with a styrene-based compound include glycidyl methacrylate, glycidyl acrylate, vinyl glycidyl ether, allyl Examples include glycidyl ethers such as glycidyl ethers and hydroxyalkyl (meth)acrylates, glycidyl ethers such as polyalkylene glycol (meth)acrylates, and epoxy group-containing copolymerizable unsaturated monomers such as glycidyl itaconate. A styrenic polymer copolymerized with such an epoxy group-containing copolymerizable unsaturated monomer can be produced by conventional bulk polymerization, solution polymerization, suspension polymerization, or emulsion polymerization using radical polymerization.

The vinyl compound containing an epoxy group is copolymerized in such a proportion that the copolymerization composition in the styrenic polymer is 0.01 to 30 mol%, preferably 0.1 to 20 mol%. If the copolymerization composition of the nyl compound containing an epoxy group is less than 0.01 mol%, the effect of improving dispersibility will be small and phase separation may occur, and if it exceeds 30 mol%, an independent phase will be formed. As a result, the affinity-bidispersity modification effect is substantially lost. Also, gelation occurs, which appears to be a result of the reaction of the epoxy groups.

Among the styrene copolymers copolymerized with the above-mentioned epoxy group-containing vinyl compounds, copolymers of glycidyl methacrylate and styrene are particularly preferred. This copolymer may be one commercially available from Nippon Oil & Fats Corporation as the Blenmar CP series.

The composition of the present invention may contain, as component (c), a styrenic copolymer copolymerized with an α,β unsaturated carboxylic acid anhydride. Here, the α,β unsaturated carboxylic acid anhydride may be any monomer that can be copolymerized with a styrene compound, such as maleic anhydride, chloromaleic anhydride, and citraconic anhydride.

These include butenyl succinic anhydride and tetrahydrophthalic anhydride. Styrenic polymers copolymerized with these unsaturated carboxylic acid anhydrides can be produced by conventional bulk polymerization, solution polymerization, suspension polymerization, or emulsion polymerization using radical polymerization.

The α,β-unsaturated carboxylic acid anhydride is copolymerized in the styrenic copolymer in such a proportion that the copolymerization composition is 0.01 to 5 mol%, preferably 0.1 to 3 mol%. . If the copolymerization composition of α,β-unsaturated carboxylic acid anhydride is less than 0.01 mol%, the effect of improving dispersibility will be small and phase separation may occur; if it exceeds 5 mol%, independent This forms a phase and essentially loses the affinity-9 dispersibility modification effect.

Among the above-mentioned styrenic copolymers copolymerized with α,β-unsaturated carboxylic acid anhydride, copolymers of maleic anhydride and styrene are particularly preferred.Such copolymers include, for example, What is commercially available as the Moremax series from Idemitsu Petrochemical ■ may be used.

In the resin composition of the present invention, the styrenic polymer having a syndiotactic structure, which is the above-mentioned component (a), is contained in an amount of 5 to 9
5% by weight, preferably 10 to 90% by weight, and 95 to 5% by weight, preferably 90 to 90% by weight of the thermoplastic resin as component (b).
It is blended in a proportion of 10% by weight. If the blending ratio of the thermoplastic resin exceeds 95% by weight, the heat resistance, rigidity, and chemical resistance of the resulting composition will decrease, and if it is less than 5% by weight, the mechanical properties will decrease.

The resin composition of the present invention contains (c) per 100 parts by weight of a mixture containing components (a) and (b) in the above ratio
) component from 0.01 to 15 parts by weight, preferably from 0.1 to 1 part by weight.
0 parts by weight.

If the amount of component (c) is less than 0.01 parts by weight, the effect of improving dispersibility will be small and phase separation may occur.

Moreover, if it exceeds 15 parts by weight, it is excessive than necessary;
This causes inconveniences such as gelation and loss of heat resistance.

The resin composition of the present invention basically comprises the above (a) to (c).
In addition, various rubber-like polymers and/or inorganic fillers or other additives such as antioxidants, nucleating agents, lubricants, etc. may be added as long as they do not impede the purpose of the present invention. It can be blended accordingly. here,
Various rubbery polymers can be used, but the most preferred are rubbery copolymers containing a styrene compound as one component, such as styrene-butadiene block copolymer rubber, Rubber in which the butadiene portion of a styrene-butadiene block copolymer is partially or completely hydrogenated, styrene-butadiene copolymer rubber, methyl acrylate-butadiene-styrene copolymer rubber, acrylonitrile-butadiene-styrene copolymer rubber,
Methyl acrylate-2-ethylhexyl acrylate-
Examples include styrene copolymer rubber, and since all of these have styrene units, they have good dispersibility in the styrenic polymer, which is component (a), which mainly has a syndiotactic structure, and as a result, their physical properties improve. The improvement effect is significant.

Further, as rubber-like polymers, natural rubber, polybutadiene, polyisoprene, polyisobutylene, neoprene, ethylene-propylene copolymer rubber, polysulfide rubber, thiol rubber, acrylic rubber, urethane rubber,
Examples include silicone rubber, epichlorohydrin rubber, and the like.

Further, as the rubbery polymer, the following compounds (1) to (4) can also be used. That is, first, a resin polymer obtained by polymerizing one or more vinyl monomers in the presence of a rubber-like polymer mainly composed of alkyl acrylate and/or alkyl methacrylate (alkyl acrylates) is prepared. be. Here, the rubber-like polymer mainly composed of alkyl acrylates refers to 70% by weight or more of the alkyl acrylates and other vinyl monomers copolymerizable therewith, such as methyl methacrylate, acrylonitrile, vinyl acetate, and styrene. 3 (lift% or less).

In this case, a polymer obtained by appropriately adding and reacting a polyfunctional monomer such as divinylbenzene 1 ethylene dimethacrylate triallyl cyanurate or triallyl isocyanurate as a crosslinking agent is also included. Above■
Specific examples of rubber-like polymers belonging to Examples include EXL-2330, manufactured by Kaneka Corporation, and product name M-101) manufactured by Kanekabuchi Kagaku Kogyo.

In addition, a copolymer obtained by copolymerizing alkyl acrylate and/or alkyl methacrylate and a polyfunctional polymerizable monomer having a conjugated diene type double bond,
There are resin polymers obtained by polymerizing one or more vinyl monomers. Incidentally, when obtaining this copolymer, a vinyl monomer and a crosslinking agent can also be added as in the case of (2) above. A specific example of a rubbery polymer belonging to the above item (■) is to use octyl acrylate and butadiene in a ratio of 7:3 (former: latter), and add styrene and methyl methacrylate to the rubber latex obtained by co-electrification. MAR3 elastomer such as a graft copolymer obtained by graft polymerization, or a graft copolymer obtained by graft polymerization by adding styrene to rubber latex obtained by copolymerizing methyl methacrylate and butadiene. MBS elastic bodies such as (commercially available product manufactured by Mitsubishi Rayon ■, trade name Metablane C-223) can be mentioned.

In addition, other elastic materials include AABS elastomer (a rubber latex obtained by copolymerizing butadiene and alkyl acrylate, graft polymerized by adding acrylonitrile and styrene) and SBR elastomer (
(polybutadiene graft polymerized with styrene), etc.

In addition, the inorganic filler is fibrous,
It does not matter whether it is in granular or powder form.

Glass fiber and carbon fiber are used as fibrous inorganic fillers.

Examples include alumina fiber. On the other hand, talc and carbon black are used as granular and powdery inorganic fillers.

Graphite, titanium dioxide, silica, mica.

Calcium carbonate, calcium sulfate, barium carbonate.

Magnesium carbonate, magnesium sulfate, barium sulfate,
Oxysulfate, tin oxide, alumina.

Examples include kaolin, silicon carbide, metal powder, and the like.

There are various antioxidants, but Tris (
Phosphorous antioxidants and phenolic antioxidants such as monophosphites and diphosphites such as 2,4-di-butylphenyl) phosphite and tris(mono- and di-nonylphenyl) phosphite are preferred. The diphosphite has the general formula [where Rt and Rz each represent an alkyl group having 1 to 20 carbon atoms, a cycloalkyl group having 3 to 20 carbon atoms, or an aryl group having 6 to 20 carbon atoms. ] It is preferable to use a phosphorus compound represented by the following.

Specific examples of the phosphorus compound represented by the above general formula include distearyl pentaerythritol diphosphite;
Dioctylpentaerythritol diphosphite; diphenylpentaerythritol diphosphite; bis(2
,4-di-t-butylphenyl)pentaerythritol diphosphite; bis(2,6-di-butyl-4-
Methylphenyl) pentaerythritol diphosphite; dicyclohexyl pentaerythritol diphosphite, and the like.

In addition, known phenolic antioxidants can be used, and specific examples thereof include 2,6-di-butyl-4-methylphenol; 2,6-diphenyl-4-methoxyphenol; .2'-methylenebis(6-t-butyl-4-methylphenol);2,2'
-Methylenebis(6-t-butyl-4-methylphenol): 2°2°-Methylenebis[4-methyl-6-(α
-methylcyclohexyl)phenol); 1,1-bis(5-t-butyl-4-hydroxy-2-methylphenyl)butane; 2,2'-methylenebis(4-methyl-6
-cyclohexylphenol); 2.2'-methylenebis-(4-methyl-6-nonylphenol); 1. t,
3-) Lis-(5-t-phthyl-4-hydroxy-2-
methylphenyl)butane; 2,2-bis-(5-butyl-4-hydroxy-2-methylphenyl) -4-
ndodecyl me2recabutane; ethylene glycol-
Bis[3,3-bis(3-t-butyl-4-hydroxyphenyl)butyrate); 1-1-bis(3,5-dimethyl-2-hydroxyphenyl)-3-(n-dodecylthio)-butane, 4.4'-thiobis(6-L-butyl-3-methylphenol); 1.3.5-)lis(3,
5-di-butyl-4-hydroxybenzyl)-2,4
,6-drimethylbenzene; 2,2-bis(3,5-di-t-butyl-4-hydroxybenzyl)malonic acid dioctadecyl ester; n-octadecyl-3-(4-hydroxy-3,5-dimethylbenzene); -t-butylphenyl)propionate; tetrakis[methylene(3,5-di-t-butyl-4-hydroxyhydrocinnamate)]methane, and the like.

The above antioxidant is based on 100 parts by weight of the styrenic polymer mainly having a syndiotactic structure.
It is blended in a proportion of 0.0001 to 2 parts by weight, preferably 0.001 to 1 part by weight.

Furthermore, a metal salt of an organic acid and/or an organic phosphorus compound can be added as a crystal nucleating agent.

There are various types of these compounds, and examples of metal salts of organic acids include benzoic acid, p-(tert
-butyl)benzoic acid, cyclohexanecarboxylic acid (hexahydrobenzoic acid), aminobenzoic acid, β-naphthoic acid, cyclopencune carboxylic acid, succinic acid, diphenylacetic acid, glutaric acid, isonicotinic acid, adipic acid, sebacic acid, phthal acids, isophthalic acid, benzenesulfonic acid, glycolic acid.

caproic acid, isocaproic acid, phenylacetic acid, cinnamic acid,
Lauric acid, myristic acid, palmitic acid.

Sodium salts of organic acids such as stearic acid and oleic acid,
Examples include metal salts such as calcium salts, aluminum salts, and magnesium salts. Among these, p-(tert-
butyl) aluminum salt of benzoic acid, sodium salt of cyclohexanecarboxylic acid.

Preferred is the sodium salt of β-naphthoic acid.

In addition, as an organic phosphorus compound, for example, the following general formula (wherein R3 represents a hydrogen atom or an alkyl group having 1 to 18 carbon atoms, R4 represents an atom having 1 to 18 carbon atoms, and M is N
a, Mg, Ca or A1. and a represents the valence of M. ) or (in the formula,
R represents a methylene group, ethylidene group, propylidene group or isopropylidene group, R'IR6 represents a hydrogen atom or an alkyl group having 1 to 6 carbon atoms, and M and a are the same as above. ) The organic phosphorus compound (b2) represented by:

More detailed examples of the above-mentioned crystal nucleating agent can be found in Japanese Patent Application No. 1983-
No. 23745.

The blending ratio is the total of component (a) and component (b): 100
0.01 to 15 parts by weight, preferably 0.01 to 15 parts by weight.
05 to 5 parts by weight.

The resin composition of the present invention can be obtained by blending the above components (a) to (c) and, if necessary, various desired components, and kneading at an appropriate temperature, for example, 270 to 320°C. The blending and kneading at this time may be carried out by conventional methods. Specifically, a melt-kneading method using a kneader-mixing roll, an extruder, a Banbury mixer-Henschel mixer, a kneading roll, or a solution blending method may be used.

〔Example〕

Next, the present invention will be explained in more detail with reference to Examples and Comparative Examples.

Reference Example 1 (Manufacture of polystyrene mainly having a syndiotactic structure) In a synthesis container, 322 toluene as a solvent and 1 methylaluminoxane as a catalyst component as an aluminum atom were placed in a synthesis container.
335 mmol and tetrae, 13.4 mmol of toxytitanium
mmol was added, followed by 15 kg of styrene.

Next, the temperature was raised to 55°C and a polymerization reaction was carried out for 2 hours.

After the reaction was completed, the obtained product was washed with a sodium hydroxide-methanol mixture to decompose and remove the catalyst component. Then, it was dried to obtain 2.1 kg of polymer.

Furthermore, this polymer was subjected to Soxhlet extraction using methyl ethyl ketone as a solvent to obtain an extraction residue of 95% by weight. This polymer has a weight average molecular weight of 400,000 and a melting point of 270°.
C, and isotopic carbon nuclear magnetic resonance ("C-NM
Analysis by R) showed absorption at 145.35 ppm due to the syndiotactic structure, and the syndiotacticity for racemic pentads calculated from the peak area was 98%.

Reference Example 2 (Manufacture of styrene-maleic anhydride copolymer) Styrene monomer 10 kg, 1 m maleic anhydride 0,35
3.68 g of 1.1-bis(tertbutylperoxy)3,3.5-)limethylcyclohexane as a polymerization initiator was added to the mixture, stirred, and left at room temperature day and night, then filtered through a filter paper. This was used as a raw material mixture for polymerization. Capacity 21
After replacing the inside of the stainless steel autoclave with styrene monomer, the temperature was raised to 100°C, and the polymerization raw material mixture was introduced into the autoclave at a speed of 8 m/min, and 42 liquids were distilled from the autoclave. After this distillation, the viscous liquid material distilled out was introduced into a large amount of hexane to precipitate a styrene-maleic anhydride copolymer resin. After hexane was removed, the composition of the copolymer resin was analyzed by 13C-NMR and found to be styrene/maleic anhydride=99/1 mol%. Moreover, when the weight average molecular weight was measured by gel permeation chromatography (GPC), it was 200,000.

Example 1 Weight average based on a total of 100 parts by weight of 70% by weight of polystyrene mainly having a syndiotactic structure obtained in Reference Example 1 and 30% by weight of nylon 6 (manufactured by Ube Industries, Ltd., Ube Nylon 1013B) as polyamide. molecular weight is 1
00,000, the copolymerization composition of styrene and glycidyl methacrylate is styrene/glycidyl methacrylate) = 951
Add 1 part by weight of 5 mol% styrene-glycidyl methacrylate copolymer and melt-knead at 280°C and 50 rpm+ using a single-screw kneading extruder with a diameter of 20 cm and a Dalmage screw with L/D = 20. After that, it was granulated.

After injection molding this pellet, various physical properties were measured. The results are shown in Table 2. A non-oriented disk-shaped product with a diameter of 15 cm and a thickness of 4 m was produced from the pellets using a press molding machine. This molded product was polished to a mirror surface using an ultramicrotome, etched with chromic acid, and the dispersion state was observed using a scanning electron microscope. The results are shown in Table 2. Further, the blend composition is shown in Table 1.

Examples 2 to 14 and Comparative Examples 1 to 8 Molded articles were produced in the same manner as in Example 1, except that the blend compositions shown in Table 1 were used, and their physical properties are shown in Table 2.

The substances used in the Examples and Comparative Examples are as follows.

(a) Component PS Polystyrene mainly having a syndiotactic structure obtained in Reference Example 1 (b) Component Nylon 6 Manufactured by Ube Industries ■, trade name: Ube Nylon 1013 B Nylon 6.6 Manufactured by Ube Industries ■, trade name: Ube Nylon 2013 Bolyarylate ET made by DuPont ■ Polyethylene terephthalate made by Mitsubishi Rayon ■ Product name: Dyanite MA-523 BT Polybutylene terephthalate made by Engineering Plastic ■ Product name: Valox 310 (c) component T-GMA Styrene made by NOF ■ -glycidyl methacrylate copolymer, weight average molecular weight 100,000, styrene/glycidyl methacrylate = 9515 mol% copolymerization ratio, product name: Blemmer-CP1005SMAI Styrene-maleic anhydride copolymer 3MA2 produced in Reference Example 2 Idemitsu Petrochemical ■ styrene-maleic anhydride copolymer,
Weight average molecular weight 280,000, styrene/maleic anhydride = 8
6/14 mol% copolymerization ratio, product name: Moremax UG8
30 S Styrene homopolymer manufactured by Idemitsu Petrochemical ■ (does not contain epoxy groups or carboxylic acid anhydride groups), weight average molecular weight 300,000, product name: Idemitsu polystyrene and other additives F Glass fiber manufactured by Asahi Fiber Glass ■, short Pudostrand, average fiber diameter 13 μm, average fiber length 3 mm Styrene-butadiene block copolymer rubber-like elastic body manufactured by BS Shell Chemical ■, styrene/butadiene = 30/70% by weight
, molecular weight 100,000, trade name: Kraton DIIOI [Effects of the invention] According to the present invention, as a result of improved affinity and dispersibility,
A polystyrene resin composition with no delamination, excellent appearance, and improved mechanical strength can be obtained without going through complicated steps.

Therefore, the resin composition of the present invention can be used in automobiles.

It is effectively used in the production of heat-resistant parts for home appliances, electrical and electronic equipment, and heat-resistant structural materials for industrial use, and provides high-quality molded products.

Procedural amendment

Claims (3)

[Claims] (1) Thermoplastic resin 95 containing (a) 5 to 95% by weight of a styrene polymer mainly having a syndiotactic structure and (b) at least one polar group selected from a carboxyl group, a hydroxyl group, and an amino group at the end (c) Styrenic copolymer copolymerized with a vinyl compound containing an epoxy group or styrene copolymerized with α,β-unsaturated carboxylic acid anhydride based on 100 parts by weight of a polymer mixture consisting of ~5% by weight A resin composition containing 0.01 to 15 parts by weight of a copolymer. (2) A styrenic copolymer copolymerized with a vinyl compound containing an epoxy group has a copolymerization composition of 0.01 to 30 mol% of a vinyl compound containing an epoxy group, a weight average molecular weight of 10,000 to 800, 2. The resin composition according to claim 1, which is a styrenic copolymer of 0.000. (3) The styrenic copolymer copolymerized with α,β-unsaturated carboxylic acid anhydride has a copolymerization composition of 0.01 to 5 mol% of α,β-unsaturated carboxylic acid anhydride, and has a weight average molecular weight 1
The resin composition according to claim 1, which is a styrene copolymer having a molecular weight of 0,000 to 800,000.