JP3264468B2 - Impact resistant polystyrene resin composition - Google Patents

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 particularly, to a syndiotactic polystyrene resin having excellent moldability, heat resistance, elastic modulus, and excellent impact resistance and elongation. Composition.

[0002]

2. Description of the Related Art
Styrene-based polymers having a syndiotactic structure (hereinafter sometimes abbreviated as SPS) exhibit excellent heat resistance and chemical resistance, but their low impact resistance limits their application range as a material. . Therefore, by blending a rubber-like elastic material and other thermoplastic resin with SPS,
Has been improved (Japanese Patent Laid-Open No. 62-257).
950, JP-A-1-146944, and JP-A-1-146944.
Nos. 182344 and 1-279944, 2
-64140). For example, SPS containing a styrene compound as one component as a rubbery elastic body (see JP-A-1-146944), a block or graft copolymer containing an atactic polystyrene chain as a compatibilizer with SPS-rubber. 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,
The above-mentioned improvement technology includes an atactic polystyrene chain as a rubber component or a compatibilizer in order to improve the compatibility between the incompatible SPS and the rubber component, and to improve the dispersibility and interface strength of the rubber component. Since a block or graft copolymer was used, the effect of the compatibilizer was insufficient, and the degree of improvement in impact strength was low. In addition, when the impact resistance is improved by adding a large amount of polyphenylene ether, the resulting composition has a lower hue, lower long-term heat resistance,
Problems such as a decrease in crystallization of PS could not be avoided.

[0003]

Means for Solving the Problems The present inventors have intensively studied 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 in combination with a rubber-like elastic body. That is, S
By blending PS with a rubber-like elastic material and a specific amount of polyphenylene ether, a syndiotactic polystyrene-based resin composition having greatly improved impact resistance and elongation without impairing moldability, heat resistance, and elastic modulus is obtained. It was found that it could be obtained. The present invention has been completed based on such findings.

That is, the present invention relates to (A) 95.0 to 99.9% by weight of a styrene polymer having a syndiotactic structure and (B) 0.1 to 5.0% by weight of a polyphenylene ether.
(C) hydrogenated polystyrene to 100 parts by weight of the mixture
-Butadiene-styrene block copolymer (SEB
S) and / or hydrogenated styrene-isoprene-styrene
The present invention provides an impact-resistant polystyrene resin composition containing 1 to 100 parts by weight of an unblock copolymer (SEPS) .

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 styrenic polymer having a syndiotactic structure is a syndiotactic structure, that is, a phenyl group or a substituent which is a side chain with respect to a main chain formed from carbon-carbon bonds. The phenyl group has a steric structure in which the phenyl groups are alternately located in opposite directions, and its tacticity is quantified by nuclear magnetic resonance ( ^13C -NMR) using isotope carbon. ¹³ C
-Tacticity measured by the NMR method can be represented by the proportion of a plurality of continuous structural units, for example, a dyad for two, a triad for three, and a pentad for five. The styrene-based polymer having a syndiotactic structure according to the present invention,
Usually 75% or more by racemic dyad, preferably 85%
%, Or 30% or more, preferably 50% or more in racemic pentad, of 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 main components. In addition, here, as poly (alkyl styrene),
Poly (methylstyrene), poly (ethylstyrene), poly (isopropylstyrene), poly (tertiary-butylstyrene), poly (phenylstyrene), poly (vinylnaphthalene), poly (vinylstyrene), etc. Examples of poly (styrene) include poly (chlorostyrene), poly (bromostyrene), and poly (fluorostyrene). The poly (halogenated alkylstyrene) includes poly (chloromethylstyrene) and the like, and the poly (alkoxystyrene) includes poly (methoxystyrene) and poly (ethoxystyrene).
Of these, particularly preferred styrenic polymers include
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. In addition, the said styrene-type polymer can be used individually by 1 type or in combination of 2 or more types.

The styrene polymer has no particular restriction on the molecular weight, but preferably has a weight average molecular weight of 100.
It is at least 00, more preferably at least 50,000. Furthermore, the molecular weight distribution is not limited in its width, and various types 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 article may be undesirably reduced. Such a styrene polymer having a syndiotactic structure can be obtained, for example, by using a titanium compound and a condensation product of water and a trialkylaluminum as a catalyst in an inert hydrocarbon solvent or in the absence of a solvent. It can be produced by polymerizing a monomer (a monomer corresponding to the styrene-based polymer) (Japanese Patent Laid-Open No. 62-187708). Further, poly (halogenated alkylstyrene) is disclosed in
No. 46912, the above hydrogenated polymer is disclosed in
It can be obtained by the method described in JP-A-8505.

The polyphenylene ether as the component (B) of the present invention is a known compound and is disclosed in US Pat.
Nos. 874, 3,306,875, 3,257,357 and 3,257,358 can be referred to. Polyphenylene ether is usually a copper amine complex,
And in the presence of one or more phenolic compounds substituted at two or three places, 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) 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, poly (2,6-dimethyl-1,4-
Phenylene ether) is preferred. The polyphenylene ether may be used alone or in combination of two or more. For example, it is also possible to use a copolymer such as a copolymer derived from two or more phenol compounds used for adjusting the homo-step. Further, for example, a graft copolymer and a block copolymer of a vinyl aromatic compound such as polystyrene and the above-mentioned polyphenylene ether can also be used.

[0008] The molecular weight of the polyphenylene ether used as the component (B) is not particularly limited, but is preferably such that the intrinsic viscosity measured at 25 ° C in chloroform is 0.
2 dl / g or more, more preferably 0.3 dl / g
The above is used. If 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, more preferably 0.5 to 5.0% by weight in the components (A) and (B). If the proportion is less than 0.1% by weight, the effect of improving impact resistance is small, and if it exceeds 5.0% by weight, the moldability is significantly reduced, which is not preferable.

The rubber-like elastic material as the component (C) of the present invention is used for improving the impact resistance of the resin composition of the present invention. Various rubber-like elastic materials can be used. 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), alkyl acrylate - butadiene - acrylonitrile - styrene - core shell rubber (AABS), butadiene - styrene - co Asherugomu (SBR) particulate elastic material of the core-shell type, such as, polysulfide rubber, Thiokol rubber, acrylic rubber, urethane rubber, epichloro Hydrin rubber, chlorinated rubber, styrene-butyl acrylate copolymer rubber, ethylene-methyl methacrylate-glycidyl methacrylate copolymer rubber, ethylene-
Ethylene-polar vinyl monomer copolymer rubber such as methyl methacrylate-maleic anhydride copolymer rubber, natural rubber, polybutadiene, polyisoprene, polyisobutylene, neoprene, silicone rubber, ethylene propylene rubber (EPR), ethylene propylene diene rubber ( EP
DM) and the like. Among them, SBR, SE
B, SBS, SEBS, SIR, SEP, SIS, SE
Core shell rubber containing PS 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. The mixing ratio of the rubber-like elastic material used as the component (C) is 1 to 100 with respect to 100 parts by weight of the mixture of the component (A) and the component (B).
Parts by weight, preferably 5 to 80 parts by weight. When this proportion is less than 1 part by weight, the effect of improving the impact resistance is small, and
If the amount is more than 00 parts by weight, the elastic modulus and heat resistance of the composition significantly decrease, which is not preferable.

It is also preferable to use a rubber-like elastic body having a polar group together with the above-mentioned rubber-like elastic body in order to improve impact resistance. Specific examples of usable rubber-like elastic materials having a polar group include polysulfide rubber, thiochol rubber, acrylic rubber, urethane rubber, epichlorohydrin rubber, chlorinated rubber, styrene-butyl acrylate copolymer rubber, and ethylene-methyl methacrylate. Rubber having a polar group such as ethylene-polar vinyl monomer copolymer rubber such as glycidyl methacrylate copolymer rubber, ethylene-methyl methacrylate-maleic anhydride 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)
Rubbers obtained by modifying M) with a modifier having a polar group. Among these, SEBS, SBR,
It is a rubber-like elastic body modified from SBS, SEPS and SIS. The rubber-like elastic body having a polar group can be used alone or in combination of two or more. Here, the polar group is not particularly limited, and examples thereof include acid halide, carbonyl group, acid anhydride, acid amide, carboxylic acid ester, acid azide, sulfone group, nitrile group, cyano group, isocyanate group, and the like.
Examples 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 the polar group is preferably at least 0.1% by weight based on the rubber-like elastic body having the polar group as the component (C), and if it is less than 0.1% by weight, the mechanical strength is improved. Sometimes you can't. As the component (C) of the present invention, in particular, 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) is the above (A).
To (C) components, unless otherwise impairing the object of the present invention, inorganic fillers, nucleating agents, antioxidants, ultraviolet absorbers, plasticizers, release agents, antistatic agents, coloring Additives such as an agent, a flame retardant, a flame retardant auxiliary, or other thermoplastic resins can be added as required. Here, for example, various kinds of inorganic fillers such as fibrous, granular, powdery, etc. can be mentioned. Examples of the fibrous filler include glass fiber, carbon fiber, whisker, Kevlar fiber, ceramic fiber, metal fiber and the like. Specifically, whiskers include boron, alumina, silica, silicon carbide, etc.
Gypsum, potassium titanate, and ceramic fibers
Examples of metal fibers such as magnesium sulfate and magnesium oxide include copper, aluminum, and steel. Here, as the shape of the filler, there are cloth, mat, bundle cut, short fiber, filament, and whisker. Also,
In the case of a bundle cut shape, it is preferable that the length is 0.05 to 50 mm and the fiber diameter is 5 to 20 μm. In the case of a cloth or mat, the length is preferably 1 mm or more, particularly 5 mm.
The above is preferred. On the other hand, as the granular or powdery filler, for example, talc, carbon black, graphite, titanium dioxide, silica, mica, calcium carbonate, calcium sulfate, barium carbonate, magnesium carbonate, magnesium sulfate, barium sulfate, oxysulfate, tin oxide, tin oxide,
Examples include alumina, kaolin, silicon carbide, metal powder, glass powder, glass flake, and glass beads. Among these fillers, in particular, glass fillers such as glass filament, glass fiber, glass roving,
Glass mat, glass powder, glass flake and glass beads are preferred.

The above-mentioned inorganic filler is preferably surface-treated. The coupling agent used for this surface treatment is used to improve the adhesion between the filler and the resin component, and is appropriately selected from so-called silane coupling agents and titanium coupling agents. Can be used. Specific examples of this silane coupling agent include triethoxysilane, vinyl tris (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,
N, N-bis (trimethylsilyl) urea and the like. Of these, preferred are γ-aminopropyltrimethoxysilane, N-β- (aminoethyl) -γ-aminopropyltrimethoxysilane, γ-glycidoxypropyltrimethoxysilane, β- (3,4- Aminosilanes such as epoxycyclohexyl) ethyltrimethoxysilane and epoxysilanes.

Specific examples of the titanium-based coupling agent include isopropyl triisostearoyl titanate, isopropyl tridodecylbenzenesulfonyl titanate, isopropyl tris (dioctyl pyrophosphate) titanate, tetraisopropyl bis (dioctyl phosphite) titanate, and 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 isostearyl titanate, isopropyl isostearyl diacryl titanate, isopropyl tri (dioctyl phosphate) titanate, isopropyl tricumyl phenyl titanate,
Isopropyltriaminoethyl titanate, dicumylphenyloxyacetate titanate, diisostearoylethylene 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 a commonly known method, and is not particularly limited. For example, a sizing treatment in which an organic solvent solution or suspension of the above-mentioned coupling agent is applied to the filler as a so-called sizing agent, or dry mixing using a Henschel mixer, a super mixer, a Lödige mixer, a V-type blender, or the like, The method can be performed by an appropriate method depending on the shape of the filler, such as a spray method, an integral blend method, and a dry concentrate method, but is preferably performed by a sizing treatment, dry mixing, or a spray method. Further, a film-forming substance for glass can be used in combination with the above-mentioned coupling agent. The film-forming substance is not particularly limited, and examples thereof include polymers of polyester type, urethane type, epoxy type, acrylic type, vinyl acetate type and polyether type.

When the inorganic filler is blended, the above (A) +
It is added in an amount of 1 to 350 parts by weight, preferably 5 to 200 parts by weight, per 100 parts by weight of the components (B) and (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, there is a problem that dispersibility is poor and molding becomes difficult. . Further, in order to improve the adhesion 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.

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

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

The composition of the present invention comprises the above (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 the pulling agent, a method of laminating and melting a sheet made of the component (A) or its composition and a glass mat, a component (A) or its composition, In addition, a method of mixing the long-fibrous inorganic filler in a liquid in a slurry state, heating after depositing, or the like can be employed. Generally, it is preferable to use ordinary melt-kneading using a Banbury mixer, a Henschel mixer or a kneading roll.

[0019]

Now, the present invention will be described in further detail with reference to Production Examples, Examples and Comparative Examples.

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

Example 2 The procedure of Example 1 was repeated, except that 760 g of syndiotactic polystyrene and 40 g of poly (2,6-dimethyl-1,4-phenylene ether) were used. It is shown in the table.

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

Example 4 Poly (2,6-dimethyl-1,4-phenylene ether) (intrinsic viscosity 0.20 dl / g, 25% in chloroform)
° C), and the operation was carried out in the same manner as in Example 1, 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 was performed in the same manner as in Example 1 except that 10 g of NA-11 manufactured by Argus was added, and the results are shown in Table 1.

Comparative Example 1 The procedure of Example 1 was repeated, except that 800 g of syndiotactic polystyrene was used and no poly (2,6-dimethyl-1,4-phenylene ether) was used. The results are shown in Table 1.

Comparative Example 2 The same operation as in Example 1 was carried out except that 700 g of syndiotactic polystyrene and 100 g of poly (2,6-dimethyl-1,4-phenylene ether) were used. It is shown in the table.

Comparative Example 3 As a nucleating agent, sodium methylenebis (2,4-di-t-butylphenol) acid phosphate (ADEKA.
The operation was performed in the same manner as in Comparative Example 1 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 clear from Table 1, the use of the component (B) makes it possible to significantly improve the impact strength and elongation as compared with the case of the components (A) + (C). By using the component (B) in an amount of 5% by weight or less of the components (A) and (B), a resin composition having both moldability, impact strength, and elongation can be obtained.

[0031]

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 elongation, and is captured by the molding method. Thus, it is possible to provide a molded article having excellent physical properties without the need. That is, the impact-resistant polystyrene resin composition of the present invention includes, for example, various molded products by injection molding, sheets and films by extrusion molding, containers and trays by extrusion and thermoforming, uniaxial by extrusion and stretching, It is expected to be effectively used for the production of fibrous molded products by spinning, such as biaxially stretched films and sheets.

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int. Cl. ⁷ , DB name) C08L 25/00-25/18 C08L 53/02 C08L 71/12

Claims (2)

(57) [Claims] 1. 100 parts by weight of a mixture of (A) 95.0 to 99.9% by weight of a styrene polymer having a syndiotactic structure and (B) 0.1 to 5.0% by weight of a polyphenylene ether. , (C) hydrogenated styrene-butadiene-based
Tylene block copolymer (SEBS) and / or hydrogenated
Styrene-isoprene-styrene block copolymer
(SEPS) An impact-resistant polystyrene resin composition comprising 1 to 100 parts by weight. 2. The intrinsic viscosity (in chloroform at 25 ° C.) of the polyphenylene ether of the component (B) is 0.20 dl / g.
The impact-resistant polystyrene resin composition according to claim 1, which is as described above.