JPH0753815A - Impact-resistant polystyrene-based resin composition - Google Patents

Abstract

PURPOSE:To obtain a syndiotactic polystyrene-based resin composition excellent in heat resistance, elasticity, moldability, impact resistance and stretchability. CONSTITUTION:This impact-resistant polystyrene-based resin composition is prepared by blending (C) 1 to 100 pts.wt. rubbery elastomer with 100 pts.wt. mixture composed of (A) 95.0-99.9wt.% styrene-based polymer having a syndiotactic structure and (B) 0.1-5.0wt.% polyphenylene ether.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an impact-resistant polystyrene resin composition, and more specifically, it is a syndiotactic polystyrene resin excellent in moldability, heat resistance, elastic modulus, impact resistance and elongation. It relates to a composition.

[0002]

2. Description of the Related Art Conventionally, the problems to be solved by the invention
A styrene-based polymer having a syndiotactic structure (hereinafter sometimes abbreviated as SPS) exhibits excellent heat resistance and chemical resistance, but its application range is limited because it has low impact resistance. . Therefore, by blending rubber-like elastic material and other thermoplastic resin with SPS,
Has been improved in impact resistance (JP-A-62-257).
950, JP-A-1-146944, 1-
No. 182344, No. 1-279944, No. 2
-64140 publication). For example, SPS containing a styrene-based compound as a component as a rubber-like elastic body (see JP-A-1-146944), a block or graft copolymer containing an atactic polystyrene chain as a compatibilizer with respect to SPS-rubber system. There are those in which a polymer is added (see JP-A-1-279944) and those in which polyphenylene ether is added to an SPS-rubber system (see JP-A-1-279944). But,
In order to improve the compatibility between the incompatible SPS and the rubber component and to improve the dispersibility of the rubber component and the interfacial strength, the above-mentioned improved technique contains an atactic polystyrene chain as the rubber component or the compatibilizing agent. Since the block or graft copolymer was used, the effect of the compatibilizing agent was insufficient, and the impact strength improvement was low. Further, when the impact resistance is improved by adding a large amount of polyphenylene ether, the hue of the resulting composition is lowered, the long-term heat resistance is lowered, the S
It was not possible to avoid problems such as deterioration of crystallization of PS.

[0003]

Means for Solving the Problems The inventors of the present invention have conducted extensive studies to solve the above problems. As a result, they have found that the above problem can be solved by using a small amount of polyphenylene ether together with a rubber-like elastic material. That is, S
By blending PS with a rubber-like elastic material and a specific amount of polyphenylene ether, a syndiotactic polystyrene resin composition with greatly improved impact resistance and extensibility without impairing moldability, heat resistance, and elastic modulus is obtained. It was found that it can be obtained. The present invention has been completed based on such findings.

That is, according to the present invention, (A) a styrene-based polymer having a syndiotactic structure (95.0 to 99.9% by weight) and (B) polyphenylene ether (0.1 to 5.0% by weight).
(C) Rubber-like elastic body 1 per 100 parts by weight of the mixture with
The present invention provides an impact-resistant polystyrene-based resin composition containing about 100 parts by weight.

The styrene polymer having a syndiotactic structure, which is the component (A) of the present invention, is used as a base component of the impact-resistant polystyrene resin composition of the present invention. Here, the syndiotactic structure in the styrene-based polymer having a syndiotactic structure is a syndiotactic structure, that is, a phenyl group or a substitution which is a side chain with respect to the main chain formed from carbon-carbon bonds. It has a steric structure in which phenyl groups are alternately located in opposite directions, and its tacticity is quantified by a nuclear magnetic resonance method ( ¹³ C-NMR method) using isotope carbon. ¹³ C
The tacticity measured by the NMR method can be indicated by the abundance ratio of a plurality of continuous constitutional units, for example, diad in the case of 2, triad in the case of 3, and pentad in the case of 5. The styrene-based polymer having a syndiotactic structure according to the present invention,
Usually, racemic diad is 75% or more, preferably 85
% Or more, or 30% or more in racemic pentad, preferably 50% or more of syndiotactic polystyrene, poly (alkylstyrene), poly (halogenated styrene), poly (halogenated alkylstyrene), poly (alkoxy) Styrene), poly (vinyl benzoate), hydrogenated polymers thereof and mixtures thereof, or copolymers containing these as the main components. Here, as poly (alkylstyrene),
There are poly (methylstyrene), poly (ethylstyrene), poly (isopropylstyrene), poly (tertiary-butylstyrene), poly (phenylstyrene), poly (vinylnaphthalene), poly (vinylstyrene), etc. Examples of the modified styrene) include poly (chlorostyrene), poly (bromostyrene), and poly (fluorostyrene). The poly (halogenated alkylstyrene) includes poly (chloromethylstyrene), and the poly (alkoxystyrene) includes poly (methoxystyrene) and poly (ethoxystyrene).
Among these, particularly preferable styrene-based polymer,
Polystyrene, poly (p-methylstyrene), poly (m
-Methylstyrene), poly (p-tertiarybutylstyrene), poly (p-chlorostyrene), poly (m-chlorostyrene), poly (p-fluorostyrene), hydrogenated polystyrene and copolymers containing these structural units. Polymers may be mentioned. In addition, the said styrene-type polymer can be used individually by 1 type or in combination of 2 or more types.

There is no particular limitation on the molecular weight of this styrene polymer, but the weight average molecular weight is preferably 100.
00 or more, more preferably 50,000 or more. Further, the molecular weight distribution is not limited in its width or width, and various kinds can be applied. here,
If the weight average molecular weight is less than 10,000, the thermal properties and mechanical properties of the resulting composition or molded product may be deteriorated, which is not preferable. Such a styrene-based polymer having a syndiotactic structure is a styrene-based single polymer, for example, in an inert hydrocarbon solvent or in the absence of a solvent, using a titanium compound and a condensation product of water and a trialkylaluminum as a catalyst. It can be produced by polymerizing a monomer (a monomer corresponding to the styrene polymer) (JP-A-62-187708). Regarding poly (halogenated alkylstyrene), JP-A-1-
No. 46912, the above hydrogenated polymer is disclosed in JP-A-1-17.
It can be obtained by the method described in Japanese Patent No. 8505.

The polyphenylene ether which is the component (B) of the present invention is a known compound and is disclosed in US Pat.
Reference can be made to the respective specifications of No. 874, No. 3,306,875, No. 3,257,357 and No. 3,257,358. Polyphenylene ether is usually a copper amine complex,
And in the presence of one or more phenol compounds substituted in two or three positions, by an oxidative coupling reaction to form a homopolymer or copolymer.
Here, as the copper amine complex, a copper amine complex derived from primary, secondary and / or tertiary amines can be used.
Examples of suitable polyphenylene ethers include poly (2,3-dimethyl-6-ethyl-1,4-phenylene ether); poly (2-methyl-6-chloromethyl-
1,4-phenylene ether); poly (2-methyl-6)
-Hydroxyethyl-1,4-phenylene ether);
Poly (2-methyl-6-n-butyl-1,4-phenylene ether); poly (2-ethyl-6-isopropyl-
1,4-phenylene ether); poly (2-ethyl-6)
-N-propyl-1,4-phenylene ether); poly (2,3,6-trimethyl-1,4-phenylene ether); poly [2- (4'-methylphenyl) -1,4-
Phenylene ether]; poly (2-bromo-6-phenyl-1,4-phenylene ether); poly (2-methyl-6-phenyl-1,4-phenylene ether); poly (2-phenyl-1,4-) Phenylene ether); poly (2-chloro-1,4-phenylene ether); poly (2-methyl-1,4-phenylene ether); poly (2-chloro-6-ethyl-1,4-phenylene ether); Poly (2-chloro-6-bromo-1,4-phenylene ether); poly (2,6-di-n-propyl-
1,4-phenylene ether); poly (2-methyl-6)
-Isopropyl-1,4-phenylene ether); poly (2-chloro-6-methyl-1,4-phenylene ether); poly (2-methyl-6-ethyl-1,4-phenylene ether); poly (2 , 6-dibromo-1,4-phenylene ether); poly (2,6-dichloro-1,4)
-Phenylene ether); poly (2,6-diethyl-)
1,4-phenylene ether) and poly (2,6-dimethyl-1,4-phenylene ether).
Among them, especially poly (2,6-dimethyl-1,4-
Phenylene ether) is preferred. In addition, the said polyphenylene ether can be used individually by 1 type or in combination of 2 or more types. For example, it is also possible to use a copolymer such as a copolymer derived from two or more of the phenol compounds used for adjusting the homostep. Furthermore, for example, a graft copolymer and a block copolymer of a vinyl aromatic compound such as polystyrene and the above polyphenylene ether can be used.

The molecular weight of the polyphenylene ether used as the component (B) is not particularly limited, but preferably, the intrinsic viscosity measured at 25 ° C. in chloroform is 0.1.
2dl / g or more, more preferably 0.3dl / g
The above is used. When the intrinsic viscosity is less than 0.2 dl / g, the effect of improving impact strength and elongation is small, which is not preferable. The blending ratio of the polyphenylene ether as the component (B) is 0.1 to 5.0% by weight, and more preferably 0.5 to 5.0% by weight in the components (A) + (B). If this ratio is less than 0.1% by weight, the impact resistance improving effect is small, and if it exceeds 5.0% by weight, the moldability is significantly deteriorated, which is not preferable.

The rubber-like elastic material which is the component (C) of the present invention is used for improving the impact resistance of the resin composition of the present invention. Various materials can be used as such a rubber-like elastic material, for example, styrene-butyl acrylate copolymer rubber, styrene-butadiene block copolymer (SBR), hydrogenated styrene-butadiene block copolymer (SEB). ), Styrene-butadiene-styrene block copolymer (SBS), hydrogenated styrene-
Butadiene-styrene block copolymer (SEBS),
Styrene-isoprene block copolymer (SIR), hydrogenated styrene-isoprene block copolymer (SE
P), styrene-isoprene-styrene block copolymer (SIS), hydrogenated styrene-isoprene-styrene block copolymer (SEPS), styrene-butadiene random copolymer, hydrogenated styrene-butadiene random copolymer, styrene -Ethylene-propylene random copolymer, styrene-ethylene-butylene random copolymer, or butadiene-acrylonitrile-styrene-core shell rubber (ABS), methyl methacrylate-butadiene-styrene-core shell rubber (MB
S), methyl methacrylate-butyl acrylate-styrene-core shell rubber (MAS), octyl acrylate-butadiene-styrene-core shell rubber (MAB)
S), core-shell type particulate elastic bodies such as alkyl acrylate-butadiene-acrylonitrile-styrene-core shell rubber (AABS), butadiene-styrene-core shell rubber (SBR), polysulfide rubber,
Thiokol rubber, acrylic rubber, urethane rubber, epichlorohydrin rubber, chlorinated rubber, styrene-butyl acrylate copolymer rubber, ethylene-methyl methacrylate-glycidyl methacrylate copolymer rubber, ethylene-methyl methacrylate-maleic anhydride copolymer rubber Ethylene-polar vinyl monomer copolymer rubber such as natural rubber, polybutadiene, polyisoprene, polyisobutylene, neoprene, silicone rubber, ethylene propylene rubber (EPR), ethylene propylene diene rubber (E
PDM) and the like. Among these, especially SBR, S
EB, SBS, SEBS, SIR, SEP, SIS, S
Core shell rubber containing EPS and styrene is preferred. In addition, the said rubber-like elastic body can be used individually by 1 type or in combination of 2 or more types. (C)
The compounding ratio of the rubber-like elastic material used as the component is 1 to 1 with respect to 100 parts by weight of the mixture of the component (A) and the component (B).
The amount is 00 parts by weight, preferably 5 to 80 parts by weight. If this proportion is less than 1 part by weight, the impact resistance improving effect is small, and if it exceeds 100 parts by weight, the elastic modulus and heat resistance of the composition are significantly lowered, which is not preferable.

It is also preferable to use a rubber-like elastic body having a polar group together with the above rubber-like elastic body in order to improve impact resistance. Specific examples of the rubber-like elastic body having a polar group that can be used include polysulfide rubber, thiochol rubber, acrylic rubber, urethane rubber, epichlorohydrin rubber, chlorinated rubber, styrene-butyl acrylate copolymer rubber, ethylene-methyl methacrylate. -Glycidyl methacrylate copolymer rubber, ethylene-methyl methacrylate-maleic anhydride copolymer rubber, and other rubbers having polar groups such as ethylene-polar vinyl monomer copolymer rubber, natural rubber, polybutadiene, polyisoprene, polyisobutylene, Neoprene, silicone rubber, styrene-butadiene block copolymer rubber (SBR), styrene-butadiene-styrene block copolymer (SB
S), hydrogenated styrene-butadiene-styrene block copolymer (SEBS), styrene-isoprene block copolymer (SIR), styrene-isoprene-styrene block copolymer (SIS), hydrogenated styrene-isoprene-styrene block Copolymer (SEPS), ethylene propylene rubber (EPR), ethylene propylene diene rubber (EPDM), ethylene butylene rubber (EB
Examples thereof include rubbers obtained by modifying M) and the like with a modifier having a polar group. Of these, the preferred ones are SEBS, SBR,
It is a rubber-like elastic body modified from SBS, SEPS and SIS. The rubber-like elastic body having a polar group may be used alone or in combination of two or more. Here, the polar group is not particularly limited, and examples thereof include acid halides, carbonyl groups, acid anhydrides, acid amides, carboxylic acid esters, acid azides, sulfone groups, nitrile groups, cyano groups, isocyanic acid ester groups,
Examples thereof include an amino group, a hydroxyl group, an imide group, a thiol group, an oxazoline group and an epoxy group. Particularly preferred polar groups are acid anhydride groups or epoxy groups, of which maleic anhydride and glycidyl methacrylate are preferred.
The content of this polar group is preferably 0.1% by weight or more with respect to the rubber-like elastic body having a polar group which is the component (C), and when less than 0.1% by weight, the mechanical strength is improved. Sometimes you can't hope. As the component (C) of the present invention, maleic anhydride-modified SEBS, maleic anhydride-modified EPR,
Epoxy-modified SEBS is preferably used.

The impact-resistant polystyrene resin composition of the present invention (hereinafter sometimes abbreviated as the present composition) has the above-mentioned (A).
To (C) component, but other than the above, as long as the object of the present invention is not impaired, inorganic filler, nucleating agent, antioxidant, ultraviolet absorber, plasticizer, release agent, antistatic agent, coloring Additives such as agents, flame retardants, flame retardant aids, and other thermoplastic resins can be blended as necessary. Here, as the inorganic filler, for example, various ones such as fibrous, granular and powdery ones can be mentioned. Examples of the fibrous filler include glass fiber, carbon fiber, whiskers, Kevlar fiber, ceramic fiber, metal fiber and the like. Specifically, the whiskers include boron, alumina, silica, silicon carbide, etc.
Ceramic fibers are gypsum, potassium titanate,
Examples of metal fibers such as magnesium sulfate and magnesium oxide include copper, aluminum and steel. Here, the shape of the filler includes cloth, mat, bundle cutting, short fiber, filament, and whiskers. Also,
In the case of the bundle cutting, the length is preferably 0.05 to 50 mm and the fiber diameter is 5 to 20 μm. In the case of cloth or mat, the length is preferably 1 mm or more, especially 5 mm.
The above is preferable. On the other hand, examples of the granular or powdery filler include talc, carbon black, graphite, titanium dioxide, silica, mica, calcium carbonate, calcium sulfate, barium carbonate, magnesium carbonate, magnesium sulfate, barium sulfate, oxysulfate, tin oxide,
Alumina, kaolin, silicon carbide, metal powder, glass powder, glass flakes, glass beads and the like can be mentioned. Among these fillers, especially glass fillers such as glass filaments, glass fibers, glass rovings,
Glass mats, glass powders, glass flakes and glass beads are preferred.

The inorganic filler is preferably surface-treated. The coupling agent used for this surface treatment is used to improve the adhesiveness between the filler and the resin component, and is appropriately selected from those known as so-called silane coupling agents and titanium coupling agents. Can be used. Specific examples of the silane coupling agent include triethoxysilane, vinyltris (β
-Methoxyethoxy) silane, γ-methacryloxypropyltrimethoxysilane, γ-glycidoxypropyltrimethoxysilane, β- (1,1-epoxycyclohexyl) ethyltrimethoxysilane, N-β- (aminoethyl) -γ -Aminopropyltrimethoxysilane, N-
β- (aminoethyl) -γ-aminopropylmethyldimethoxysilane, γ-aminopropyltriethoxysilane, N-phenyl-γ-aminopropyltrimethoxysilane, γ-mercaptopropyltrimethoxysilane, γ
-Chloropropyltrimethoxysilane, γ-aminopropyltrimethoxysilane, γ-aminopropyl-tris (2-methoxy-ethoxy) silane, N-methyl-γ-
Aminopropyltrimethoxysilane, N-vinylbenzyl-γ-aminopropyltriethoxysilane, triaminopropyltrimethoxysilane, 3-ureidopropyltrimethoxysilane, 3- (4,5-dihydroimidazole) propyltriethoxysilane, hexa Methyldisilazane, N, O- (bistrimethylsilyl) amide,
Examples thereof include N, N-bis (trimethylsilyl) urea. Of these, preferred are γ-aminopropyltrimethoxysilane, N-β- (aminoethyl) -γ-aminopropyltrimethoxysilane, γ-glycidoxypropyltrimethoxysilane and β- (3,4- Epoxycyclohexyl) ethyltrimethoxysilane and other aminosilanes and epoxysilanes.

Specific examples of titanium coupling agents include isopropyltriisostearoyl titanate, isopropyl tridodecylbenzenesulfonyl titanate, isopropyl tris (dioctyl pyrophosphate) titanate, tetraisopropyl bis (dioctyl phosphite) titanate, tetraoctyl. Bis (ditridecylphosphite) titanate, tetra (1,1-diallyloxymethyl-1-butyl) bis (ditridecyl) phosphite titanate, bis (dioctylpyrophosphate) oxyacetate titanate, bis (dioctylpyrophosphate) ethylene titanate, Isopropyl trioctanoyl titanate,
Isopropyl dimethacryl isostearoyl titanate, isopropyl isostearoyl diacrylic titanate, isopropyl tri (dioctyl phosphate) titanate, isopropyl tricumyl phenyl titanate,
Examples thereof include isopropyl triaminoethyl titanate, dicumylphenyloxyacetate titanate, diisostearoyl ethylene titanate and the like. Preferred among these is isopropyltriaminoethyl titanate.

The surface treatment of the filler using such a coupling agent can be carried out by an ordinary known method, and there is no particular limitation. For example, a sizing treatment in which an organic solvent solution or suspension of the above coupling agent is applied to a filler as a so-called sizing agent, or dry mixing using a Henschel mixer, super mixer, Loedige mixer, V-type blender, or the like, Although it can be carried out by an appropriate method such as a spray method, an integral blend method, a dry concentrate method or the like depending on the shape of the filler, it is preferably carried out by a sizing treatment, dry mixing or a spray method. Further, a film-forming substance for glass can be used together with the above coupling agent. The film-forming substance is not particularly limited, and examples thereof include polyester-based, urethane-based, epoxy-based, acrylic-based, vinyl acetate-based, and polyether-based polymers.

When an inorganic filler is blended, the above (A) +
1 to 350 parts by weight, preferably 5 to 200 parts by weight, are added to 100 parts by weight of the components (B) + (C). If the compounding amount of the surface-treated filler is less than 1 part by weight, a sufficient compounding effect as a filler is not exhibited, and if it exceeds 350 parts by weight, dispersibility is poor and molding becomes difficult. . Further, in order to improve the adhesiveness between the inorganic filler and the resin, maleic anhydride-modified PPO, maleic anhydride-modified SPS and the like can be added in the range of 0.1 to 5.0 parts by weight.

Further, examples of the nucleating agent include metal salts of organic acids and organic phosphorus compounds. Among these, preferred are aluminum salts of di-p-tert-butylbenzoic acid, aluminum salts of p- (tert-butyl) benzoic acid,
They are sodium salt of cyclohexanecarboxylic acid and sodium salt of β-naphthoic acid. A preferred organic phosphorus compound is sodium methylenebis (2,4-di-t-butylphenol) acid phosphate. The nucleating agents may be used alone or in combination of two or more.

As the antioxidant, (2,6-di-t-
Butyl-4-methylphenyl) pentaerythritol diphosphite (manufactured by ADEKA ARGUS CORPORATION, PEP-3)
6), tetrakis (methylene-3- (3 ', 5'-di-
t-Butyl-4′-hydroxyphenyl)) propionate (manufactured by ADEKA ARGUS CORPORATION, MARK A060) and the like can be used. The antioxidants may be used alone or in combination of two or more. As a plasticizer, polyethylene glycol, ethylene bisamide, low molecular weight polyamide (Kyoeisha Chemical Co., Ltd.)
Manufactured, light amide) or the like can be used.

The composition of the present invention comprises the above-mentioned (A),
It is prepared by blending the components (B) and (C) at a predetermined ratio, and further blending and blending other additives or other thermoplastic resins as necessary. As this blending method, a conventionally known melt-kneading method,
A solution blending method or the like can be appropriately adopted. In addition, as a method of blending the inorganic filler treated with a pulling agent, a method of laminating and melting a sheet made of the component (A) or the composition thereof and a glass mat, the component (A) or the composition thereof, Alternatively, a method of mixing the long fibrous inorganic filler in a liquid in a slurry form, depositing and heating, and the like can be adopted. Generally, it is preferable to use a usual melt-kneading using a Banbury mixer, a Henschel mixer or a kneading roll.

[0019]

EXAMPLES Next, the present invention will be described in more detail with reference to production examples, examples and comparative examples.

Example 1 SPS (weight average molecular weight 360,000, weight average molecular weight / number average molecular weight 2.40) 780 g, poly (2,6-dimethyl-1,4-phenylene ether) (intrinsic viscosity 0.45 dl)
/ G, in chloroform, 25 ° C.) 20 g, SEBS (Shell Chem. Co. Kraton G-165) as a rubber-like elastic body
1) 200 g, as an antioxidant, (2,6-di-t-butyl-4-methylphenyl) pentaerythritol diphosphite (manufactured by ADEKA ARGUS, PEP-36) 1
g, tetrakis (methylene-3- (3 ′, 5′-di-t
-Butyl-4'-hydroxyphenyl)) propionate (manufactured by Adeka Argus Co., MARK AO60) 1 g
Was added, dry blended with a Henschel mixer, and pelletized with a twin-screw extruder. Injection molding was performed using the obtained pellets to obtain a tensile test piece and an Izod test piece. Izod impact strength and elongation were measured using the obtained test pieces, and the obtained results are shown in Table 1.

Example 2 The same operation as in Example 1 was conducted except that 760 g of syndiotactic polystyrene and 40 g of poly (2,6-dimethyl-1,4-phenylene ether) were used, and the result was the first. Shown in the table.

Example 3 SEBS (Shell Chem. Co. Krato) was used as a rubber-like elastic material.
n G-1651) 160 g and maleic anhydride modified SEB
The same operation as in Example 2 was carried out except that 40 g of S (M-1913, manufactured by Asahi Kasei Co., Ltd.) was also used, and the results are shown in Table 1.

Example 4 Poly (2,6-dimethyl-1,4-phenylene ether) (intrinsic viscosity 0.20 dl / g, in chloroform, 25
The same operation as in Example 1 was carried out except that (° C.) was used, and the results are shown in Table 1.

Example 5 As a nucleating agent, sodium methylenebis (2,4-di-t-butylphenol) acid phosphate (Adeka.
The operation is performed in the same manner as in Example 1 except that 10 g of NA-11) manufactured by Argus Inc. is added, and the results are shown in Table 1.

Comparative Example 1 The same operation as in Example 1 was conducted except that 800 g of syndiotactic polystyrene was used and poly (2,6-dimethyl-1,4-phenylene ether) was not used. The results are shown in Table 1.

Comparative Example 2 The procedure of Example 1 was repeated, except that 700 g of syndiotactic polystyrene and 100 g of poly (2,6-dimethyl-1,4-phenylene ether) were used, and the result was the first. Shown in the table.

Comparative Example 3 As a nucleating agent, methylenebis (2,4-di-t-butylphenol) acid phosphate sodium (Adeka.
The same operation as in Comparative Example 1 was carried out except that 10 g of NA-11 manufactured by Argus was added, and the results are shown in Table 1.

[0028]

[Table 1]

* 1: Conforms to JIS K 7110 (with notch) * 2: Conforms to JIS K 7113 * 3: Good moldability ◎>○> × * 4: Intrinsic viscosity 0.45 dl / g (25 in chloroform,
℃) * 5: Intrinsic viscosity 0.20 dl / g (in chloroform, 25
℃)

As is apparent from Table 1, the use of the component (B) makes it possible to remarkably improve the impact strength and the extensibility as compared with the case of the components (A) + (C). Further, by using the component (B) in the range of 5% by weight or less in the components (A) + (B), it is possible to obtain a resin composition having both moldability and impact strength and extensibility.

[0031]

INDUSTRIAL APPLICABILITY As described above, the impact-resistant polystyrene resin composition of the present invention has high heat resistance, elastic modulus and moldability, as well as excellent impact resistance and extensibility, and is caught by the molding method. It is possible to provide a molded product having excellent physical properties. That is, the impact-resistant polystyrene resin composition of the present invention is, for example, various molded articles by injection molding, sheets, films, etc. by extrusion molding, containers by extrusion molding and thermoforming, trays, etc., uniaxial by extrusion molding and stretching, It is expected to be effectively used in the production of biaxially stretched films, sheets, and other fibrous molded products by spinning.

Claims (3)

[Claims] 1. A mixture of 100% by weight of a mixture of (A) a styrene polymer having a syndiotactic structure 95.0 to 99.9% by weight and (B) a polyphenylene ether of 0.1 to 5.0% by weight. , (C) an impact resistant polystyrene resin composition containing 1 to 100 parts by weight of a rubber-like elastic material. 2. The intrinsic viscosity (in chloroform, 25 ° C.) of the polyphenylene ether (B) is 0.20 dl / g.
The impact-resistant polystyrene resin composition according to claim 1, which is the above. 3. The impact-resistant polystyrene resin composition according to claim 1, wherein the rubber-like elastic body as the component (C) has a styrene chain.