JPH08143729A - Polystyrene resin composition - Google Patents

Abstract

PURPOSE: To obtain a syndiotactic polystyrene resin composition which can give a molding being excellent in rigidity, heat resistance, impact resistance and water resistance and improved in water absorptivity, a change in properties after absorption of water, falling-weight impact strength, weld strength and surface appearance. CONSTITUTION: This resin composition comprises 1-60wt.% syndiotactic styrene polymer (a), 95-40wt.% thermoplastic resin (b) having reactive polar groups and 0.1-10wt.% compatibilizer (c) being compatiple with component (a) and having polar groups reactive with component (b). The viscosity of component (a) at a shear rate of 10<3> sec<-1> at 300 deg.C should be larger than that of component (b).

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a novel polystyrene resin composition, and more specifically, it is suitable as a material for industrial materials such as electric / electronic materials, industrial structural materials, automobile parts, home electric appliances and various machine parts. The present invention relates to a syndiotactic polystyrene resin composition having excellent rigidity, heat resistance, impact resistance and water resistance.

[0002]

2. Description of the Related Art Conventionally, a styrene polymer having a syndiotactic structure (hereinafter sometimes referred to as SPS)
Has excellent heat resistance, chemical resistance, water resistance, and acid / alkali resistance, but its range of application as a material was limited due to its low impact resistance. On the other hand, a polymer having a polar group such as polyamide is excellent in moldability and heat resistance, but it has been desired to be improved because it has a remarkable change in physical properties at the time of water absorption and water absorption and a significant decrease in physical properties due to acid / alkali. In order to solve such a problem, alloying of SPS and polyamide has been conventionally proposed (JP-A-62-25).
7950). However, a composition composed of an essentially incompatible resin such as SPS and polyamide cannot avoid a decrease in mechanical properties due to poor dispersibility and insufficient interfacial strength between phases, and thus a simple composition There was a limit to the modifying effect of the compounding. In order to improve dispersibility and interfacial strength, as a compatibilizing agent or a compatibilizing agent / rubber-like elastic material, for example, a styrene-polyamide block copolymer (JP-A-1-279944) or a styrene-glycidyl methacrylate copolymer is used. Polymer, styrene-maleic anhydride copolymer (JP-A-2-209938), maleic anhydride-modified styrene block copolymer rubber (JP-A-2-219843), maleic anhydride-modified polyphenylene ether (JP-A-2 3-126744
No.), SPS modified with maleic anhydride (JP-A-6-11).
No. 6455) has been proposed. However, in any case, it could not be said that the mechanical properties and the balance between the mechanical properties and the heat resistance were still sufficient. Further, in order to improve the mechanical properties and the balance between the mechanical properties and the heat resistance, SPS and polyamide are compounded with a specific rubber-like elastic material and a compatibilizer, or modified SPS and polyamide are compounded with a specific rubber-like elastic material. (Japanese Patent Application No. 5-134259) has been proposed, but these methods have not been sufficient in terms of drop weight impact strength, weld strength and surface appearance.

[0003]

Under the circumstances, the present invention provides excellent rigidity, heat resistance, impact resistance, water resistance, etc., which are suitably used as materials for various industrial materials. The object of the present invention is to provide a syndiotactic polystyrene-based resin composition which has water absorption and physical properties change upon water absorption, drop weight impact strength, weld strength and surface appearance.

[0004]

DISCLOSURE OF THE INVENTION The present inventors have improved water absorption and physical property changes during water absorption, drop weight impact strength, weld strength and surface appearance without impairing the mechanical properties of polyamide in a polyamide matrix. As a result of earnest studies to develop a resin composition, SPS and polyamide are blended with a specific rubber-like elastic body and a specific compatibilizer, or modified SPS and polyamide are blended with a specific rubber-like elastic body, Further, it has been found that by controlling the viscosity of the system, it is possible to solve the above problems and obtain a polystyrene resin composition having improved falling weight impact strength, weld strength and surface appearance. The present invention has been completed based on such findings.

That is, the present invention provides (1) (a) 1 to 60% by weight of a styrene polymer having a syndiotactic structure, (b) 95 to 40% by weight of a thermoplastic resin having a reactive polar group, and (d) (a) has a compatibility with the component, and the compatibilizing agent consists of 0.1 to 10 wt% with reactive polar groups and component (b), 10 ³
A polystyrene resin composition having a viscosity of (a) at 300 ° C. at a shear rate of sec ⁻¹ higher than that of (b), (2) (a) a styrene polymer having a syndiotactic structure. 1 to 60% by weight of the combination, (b) 95 to 40% by weight of a thermoplastic resin having a reactive polar group, (c) a polar group capable of reacting with the (b) component, and (a) component 1-50% by weight of a rubber-like elastic body having a compatible part, and (d) (a)
Comprising 0.1 to 10% by weight of a compatibilizer having a polar group capable of reacting with the component (b) and having compatibility with the component,
A polystyrene resin composition having a viscosity of (a) at 300 ° C. at a shear rate of ³ sec ⁻¹ higher than that of (b), (3) (a) a styrene resin having a syndiotactic structure. 1 to 60% by weight of polymer, 95 to 40% by weight of (b) a thermoplastic resin having a reactive polar group, (c) a polar group capable of reacting with (b) component, and (a) component 1 to 50% by weight of a rubber-like elastic body having a compatible part of, and (d) (a)
Comprising 0.1 to 10% by weight of a compatibilizer having a polar group capable of reacting with the component (b) and having compatibility with the component,
A polystyrene resin composition, wherein the viscosity of (a) and the viscosity of (c) at 300 ° C. at a shear rate of ³ sec ⁻¹ are respectively larger than the viscosity of (b), (4) (a ′) Styrene-based polymer 1 having a modified syndiotactic structure having a polar group capable of reacting with component (b)
To 60% by weight, (b) 95 to 40% by weight of a thermoplastic resin having a reactive polar group, and (c) a polar group capable of reacting with the (b) component, and (a ') component 1 to 50% by weight of a rubber-like elastic body having a compatible part, and 10 ³ sec ^-1
The viscosity of (a ′) at 300 ° C. at the shear rate of is (b)
(5) Styrene-based polymer 1 having a modified syndiotactic structure having a polar group capable of reacting with the components (a ′) and (b).
To 60% by weight, (b) 95 to 40% by weight of a thermoplastic resin having a reactive polar group, and (c) a polar group capable of reacting with the (b) component, and (a ') component 1 to 50% by weight of a rubber-like elastic body having a compatible part, and 10 ³ sec ^-1
(6) (a ') (b), wherein the viscosity of (a') and the viscosity of (c) at 300 ° C at a shear rate of 2 are larger than the viscosity of (b), respectively. Styrene-based polymers 1 to 6 having a syndiotactic structure having a polar group capable of reacting with the component
0% by weight, (b) 95-40% by weight of a thermoplastic resin having a reactive polar group, (c) a polar group capable of reacting with the (b) component, and compatible with the (a ') component. 1 to 50% by weight of a rubber-like elastic body having a part, and a compatibilizing agent having compatibility with the component (d) (a ') and having a polar group capable of reacting with the component (b) 0.1 to A polystyrene resin composition comprising 10% by weight and having a viscosity of (a ′) at 300 ° C. at a shear rate of 10 ³ sec ⁻¹ higher than that of (b), (7) (a ′) ) (B) Styrene-based polymers 1 to 6 having a syndiotactic structure having a polar group capable of reacting with the component
0% by weight, (b) 95-40% by weight of a thermoplastic resin having a reactive polar group, (c) a polar group capable of reacting with the (b) component, and compatible with the (a ') component. 1 to 50% by weight of a rubber-like elastic body having a part, and a compatibilizing agent having compatibility with the component (d) (a ') and having a polar group capable of reacting with the component (b) 0.1 to A polystyrene resin composition comprising 10% by weight and having a viscosity of (c) and a viscosity of (a ′) at 300 ° C. at a shear rate of 10 ³ sec ⁻¹ higher than that of (b), And (8) a polystyrene resin composition comprising 100 parts by weight of the resin composition according to any one of (1) to (7) and (e) 1 to 350 parts by weight of an inorganic filler. It is a thing.

In each of the resin compositions (1) to (3) and (8) of the present invention, a styrene polymer having a syndiotactic structure is used as the component (a).
Here, the syndiotactic structure in the styrene-based polymer having a syndiotactic structure is a syndiotactic structure in three-dimensional structure, that is, a phenyl group or a substitution which is a side chain to a main chain formed from a carbon-carbon bond. 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 poly (halogenated 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).

Of these, particularly preferred styrene polymers are 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. In addition, the said styrene-type polymer can be used individually by 1 type or in combination of 2 or more types. The styrene-based polymer is not particularly limited in molecular weight, but the weight average molecular weight is preferably 10,000 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.

The styrene-based polymer having such a syndiotactic structure can be prepared, for example, in an inert hydrocarbon solvent,
Alternatively, it is produced by polymerizing a styrene-based monomer (a monomer corresponding to the above-mentioned styrene-based polymer) using a titanium compound and a condensation product of water and a trialkylaluminum as a catalyst in the absence of a solvent. Can be performed
No. 187708). The poly (halogenated alkylstyrene) can be obtained by the method described in JP-A-1-46912, and the hydrogenated polymer can be obtained by the method described in JP-A-1-178505.

In each of the resin compositions (4) to (8) of the present invention, a modified SPS having a polar group capable of reacting with the component (b) described later is used as the component (a '). This modified SPS can be obtained, for example, by modifying the SPS shown in the above component (a) with a modifying agent, but is not limited to this method as long as it can be used for the purpose of the present invention. . The SPS used for modification is not particularly limited, and it is possible to use the polymer shown in the above component (a). In particular, the copolymer of styrene and substituted styrene is compatible with other components. It is preferably used. The composition ratio of the copolymer is not particularly limited,
The content of the substituted styrene unit is preferably in the range of 3 to 50 mol%. If this content is less than 3 mol%, modification is difficult, and if it exceeds 50 mol%, the compatibility with other components decreases, which is not preferable. Particularly preferred substituted styrenes include alkyl styrenes such as methyl styrene, ethyl styrene, isopropyl styrene, tertiary butyl styrene and vinyl styrene, chlorostyrenes,
Examples thereof include halogenated styrenes such as bromostyrene and fluorostyrene, halogenated alkylstyrenes such as chloromethylstyrene, and alkoxystyrenes such as methoxystyrene and ethoxystyrene. These substituted styrenes may be used alone or in combination of two or more. Further, the above-mentioned polymer having an atactic structure can be used as long as the amount is 5% by weight or less based on SPS. If it is used in an amount of more than 5% by weight, the heat resistance of the composition is lowered, which is not preferable.

As the modifier used for modifying the SPS, a compound having an ethylenic double bond and a polar group in the same molecule can be used. Examples of such modifiers include maleic anhydride, maleic acid, maleic acid ester, maleimide and its N-substituted product, maleic acid salt, acrylic acid, acrylic acid ester, acrylic acid amide, acrylic acid salt, methacrylic acid, methacrylic acid. Examples thereof include acid esters, methacrylic acid amides, methacrylic acid salts, fumaric acid, glycidyl methacrylate, and among these, maleic anhydride, fumaric acid and glycidyl methacrylate are particularly preferably used. These modifiers may be used alone or in combination of two or more.

The modified SPS can be obtained, for example, by reacting the SPS with a modifying agent in the presence of a solvent or another resin. The modification method is not particularly limited, and a known method, for example, a method of melt kneading at a temperature in the range of 150 to 350 ° C. using a roll mill, a Banbury mixer, an extruder, or the like, or reacting, or benzene, toluene,
It is possible to use a method such as heating reaction in a solvent such as xylene. Furthermore, in order to facilitate these reactions, benzoyl peroxide, di-t-butyl peroxide, dicumyl peroxide, t-butyl peroxybenzoate, azobisisobutyronitrile, azobisisovalero are added to the reaction system. The presence of a radical generator such as nitrile or 2,3-diphenyl-2,3-dimethylbutane is effective. A preferable method is a method of melt-kneading in the presence of a radical generator. Among these modified SPS, especially maleic anhydride modified SPS
Alternatively, fumaric acid-modified SPS is preferably used. Also,
The modified SPS of the component (a ') may be used alone or in combination of two or more kinds. The blending amount of the component (a) or the component (a ′) is based on the total weight of the resin components,
It is selected in the range of 1 to 60% by weight, preferably 3 to 55% by weight, more preferably 5 to 50% by weight. If this blending amount is less than 1% by weight, the characteristics of SPS will not be exhibited and 60
If it exceeds 5% by weight, the SPS becomes too much and the matrix is reversed, so that the effect is not sufficiently exerted.

In each of the resin compositions (1) to (8) of the present invention, a thermoplastic resin having a reactive polar group is used as the component (b). The thermoplastic resin having a reactive polar group is a thermoplastic resin containing at least one polar group such as a carboxyl group, a hydroxyl group and an amino group. Examples of such a thermoplastic resin include polyethylene terephthalate, polypropylene terephthalate, polybutylene terephthalate, polycyclohexanedimethylene terephthalate, polyoxyethoxybenzoate, polyethylene naphthalate, or the above polyester constituent components and other acid components and / or glycol components. , Acid components such as isophthalic acid, p-oxybenzoic acid, adipic acid, sebacic acid, glutaric acid, diphenylmethanedicarboxylic acid, dimer acid, hexamethylene glycol, diethylene glycol, neopentyl glycol, bisphenol A, neopentyl glycol alkylene oxide addition Obtained by copolymerizing a glycol component such as a product, an aromatic polyester-polyether block copolymer, Examples include aromatic polyester-polylactone block copolymers, polyesters in a broad sense such as polyarylate, and polyamides, polycarbonates, polyolefins such as polar group-modified polyethylene and polar group-modified polypropylene, and polyarylene sulfides. Of these, polyamide is particularly preferred.

As the polyamide, any known polyamide can be used. Suitable polyamides include, for example, polyamide-4, polyamide-6, polyamide-6,6, polyamide-3,4, polyamide-12,
Polyamide-11, polyamide-6,10, polyamide obtained from terephthalic acid and 4,4'-diaminohexylmethane, azelaic acid, adipic acid and polyamide obtained from 2,2-bis (p-cyclohexyl) propane, adipic acid And a polyamide obtained from m-xylylenediamine and the like. The aromatic polyamide resin is a polyamide polymer containing an amide bond having an aromatic ring in the main chain as a repeating structural unit, and is obtained by reacting an aromatic diamine component and a dicarboxylic acid component by a conventional method. It is used by appropriately selecting from the polymer obtained by reacting the combined product and the dicarboxylic acid component with the dicarboxylic acid component having an aromatic ring by a conventional method.

Examples of the aromatic diamine component include 1,4-diaminobenzene; 1,3-diaminobenzene; 1,2-diaminobenzene; 2,4-diaminotoluene; 2,3-diaminotoluene; 2 , 5-diaminotoluene; 2,6-diaminotoluene; ortho, meta,
Para xylylenediamine; ortho, meta, para para 2,2′-diaminodiethylbenzene; 4,4′-diaminobiphenyl; 4,4′-diaminodiphenylmethane; 4,4′-diaminodiphenyl ether; 4,4 ′
Diamines having a benzene ring such as diaminodiphenyl thioether; 4,4′-diaminodiphenyl ketone; 4,4′-diaminodiphenyl sulfone are used, and the aromatic diamine component is the above-mentioned benzene ring-containing diamines alone. As long as it is contained, it may be a mixture with other diamines, for example, aliphatic diamines. Of course, two or more kinds of diamines having an aromatic ring may be mixed and used.

Next, examples of the dicarboxylic acid component include aliphatic dicarboxylic acids such as glutaric acid, adipic acid, pimelic acid, suberic acid, azelaic acid and sebacic acid.
Examples thereof include aromatic dicarboxylic acids such as phthalic acid, isophthalic acid, terephthalic acid and naphthalenedicarboxylic acid, as well as esters and acid chlorides of these dicarboxylic acids, which may be used alone or in combination of two kinds. The above may be used in combination. Furthermore, an aromatic polyamide resin can also be obtained by polymerizing an ω-amino-ω'-carboxyl compound having an aromatic ring, and such an ω-amino-ω'-carboxyl compound having an aromatic ring is, for example, 4 -Aminophenylcarboxymethane, 1- (4-aminophenyl) -2-carboxylethane, 3- (4-aminophenyl) -1-carboxylpropane, p- (3-amino-3'-carboxy) dipropylbenzene, etc. Can be mentioned. A preferred aromatic polyamide resin is a polyamide derived from a diamine having a benzene ring and an aliphatic dicarboxylic acid, and more preferable is a polyamide derived from xylylenediamine and adipic acid.

The thermoplastic resin having a reactive polar group of the component (b) may be used alone or in combination of two or more kinds, and the compounding amount thereof is based on the total weight of the resin component. 95 to 45% by weight, preferably 85 to 50% by weight. The blending amount of this component (b) is 95
When the content exceeds 50% by weight, the water resistance and the stability against acid / alkali are the same as those of the component (b) alone.
When the amount is less than the above, the amount of the component (b) is too small and the matrix is reversed, so that the improving effect of the present invention is not sufficiently exhibited.

In each of the resin compositions (2) to (8) of the present invention, the component (c) has a polar group capable of reacting with the component (b) and has the component (a). A rubber-like elastic body having a compatible portion is used. This rubber-like elastic material is blended to improve impact resistance and toughness such as elongation. Here, the polar group capable of reacting with the component (b) is
(B) refers to a functional group capable of reacting with a polar group contained in the component,
Specifically, acid anhydride groups, carboxylic acid groups, carboxylic acid ester groups, carboxylic acid chloride groups, carboxylic acid amide groups, carboxylic acid groups, sulfonic acid groups, sulfonic acid ester groups,
Examples thereof include a sulfonic acid chloride group, a sulfonic acid amide group, a sulfonate group, an epoxy group, an amino group, an imide group, and an oxazoline group. Further, the one having a compatible part with the component (a) or the component (a ′) refers to one having a chain having an affinity with the SPS of the component (a) or the modified SPS of the component (a ′), Specific examples thereof include those having a styrene chain, a styrene copolymer segment, a polyphenylene ether segment, etc. as a main chain, a block or a graft chain, and a random copolymer rubber containing a styrene monomer unit.

Examples of the rubber-like elastic material used as the component (c) include styrene-butyl acrylate copolymer rubber and styrene-butadiene block copolymer (S
BR), 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 (SEP), styrene-isoprene-styrene block copolymer (SI
S), hydrogenated styrene-isoprene-styrene block copolymer (SEPS), styrene-butadiene random copolymer, hydrogenated styrene-butadiene random copolymer, styrene-ethylene-propylene random copolymer, styrene-ethylene- Examples thereof include rubbers obtained by modifying a butylene random copolymer with a modifier having a polar group. Among these, especially SEB, SEBS,
Rubber modified with SEP or SEPS is preferably used. Specific examples include maleic anhydride-modified SEBS, maleic anhydride-modified SEPS, epoxy-modified SEBS, and epoxy-modified SEPS. The rubber-like elastic body as the component (c) may be used alone or in combination of two or more, and the compounding amount thereof is from 1 to 50% by weight, preferably based on the total weight of the resin component. It is selected in the range of 5 to 40% by weight. If the content is less than 1% by weight, the effect of improving impact resistance will not be sufficiently exerted, and if it exceeds 50% by weight, the elastic modulus and heat resistance of the composition will be significantly reduced.

Further, in the composition of the present invention, other rubber-like elastic material may be blended, if desired, in combination with the rubber-like elastic material as the component (c). Examples of the other rubber-like elastic body include natural rubber, polybutadiene, polyisoprene, polyisobutylene, neoprene, polysulfide rubber, thiochol rubber, acrylic rubber, urethane rubber, silicone rubber, epichlorohydrin rubber, styrene-butadiene block copolymer. (SBR), hydrogenated styrene-butadiene block copolymer (SEB),
Styrene-butadiene-styrene block copolymer (S
BS), hydrogenated styrene-butadiene-styrene block copolymer (SEBS), styrene-isoprene block copolymer (SIR), hydrogenated styrene-isoprene block copolymer (SEP), styrene-isoprene-styrene block copolymer Combined (SIS), hydrogenated styrene-isoprene-styrene block copolymer (SEP)
S), styrene-butadiene random copolymer, hydrogenated styrene-butadiene random copolymer, styrene-
Ethylene-propylene random copolymer, styrene-ethylene-butylene random copolymer, ethylene propylene rubber (EPR), ethylene propylene diene rubber (E
PDM), 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-core shell rubber (SBR) and other core-shell type particulate elastic bodies, or rubbers obtained by modifying these. Among these, especially SBR and S
ER, SBS, SEBS, SIR, SEP, SIS, S
Core shell rubbers containing EPS and styrene units are preferably used.

The particle size of these core-shell rubbers is not particularly limited, but it should be selected in the range of preferably 0.05 to 1.5 μm, particularly preferably 0.1 to 1.0 μm.
Here, when the particle diameter of the core-shell rubber is less than 0.05 μm,
The impact resistance improvement effect is not always sufficient, and conversely 1.5
If it exceeds μm, the dispersed state may not be good, and as a result, impact resistance may not be effectively improved. When these rubber-like elastic bodies are used in combination, the total blending ratio of the component (c) and the combined rubber-like elastic body is 50% by weight or less from the viewpoint of elastic modulus and heat resistance. desirable. The blending ratio of the core-shell rubber is not particularly limited, but the core-shell rubber is preferably 5 to 95 in the rubber-like elastic body which is the component (c).
It may be blended so as to occupy 20% by weight, particularly preferably 20 to 80% by weight. Outside these ranges, the effect of using the rubber-like elastic body as the component (c) and the core-shell rubber in combination is
It may not be expressed sufficiently.

In each of the resin compositions (1) to (4) and (6) to (8) of the present invention, as the component (d),
A compatibilizer having compatibility with the component (a) and a polar group capable of reacting with the component (b) is used. This compatibilizer is added for the purpose of improving the compatibility between the component (a) or the component (a ') and the component (b), finely dispersing the domains, and improving the interfacial strength. In the component (d), the polar group capable of reacting with the component (b) is
(B) refers to a functional group capable of reacting with a polar group contained in the component,
Specifically, acid anhydride groups, carboxylic acid groups, carboxylic acid ester groups, carboxylic acid chloride groups, carboxylic acid amide groups, carboxylic acid groups, sulfonic acid groups, sulfonic acid ester groups,
Examples thereof include a sulfonic acid chloride group, a sulfonic acid amide group, a sulfonate group, an epoxy group, an amino group, an imide group, and an oxazoline group. Further, the one having compatibility with the component (a) or the component (a ′) refers to one having a skeleton compatible with the SPS of the component (a) or the modified SPS of the component (a ′), and Specific examples thereof include those having a styrene chain, a styrene copolymer segment, a polyphenylene ether segment, etc. as the main chain, block or graft chain.

Specific examples of the compatibilizer used as the component (d) include styrene-maleic anhydride copolymer (SMA), styrene-glycidyl methacrylate copolymer, terminal carboxylic acid-modified polystyrene, terminal oxazoline-modified polystyrene. , Terminal amino-modified polystyrene,
Sulfonated polystyrene, styrene ionomer, styrene-methyl methacrylate graft copolymer, (styrene-glycidyl methacrylate) -methyl methacrylate graft copolymer, acid-modified acrylic-styrene graft copolymer, (styrene-glycidyl methacrylate) -styrene graft Copolymer, polybutylene terephthalate-polystyrene graft copolymer, further modified SPS such as maleic anhydride modified SPS, glycidyl methacrylate modified SPS, amine modified SPS, (styrene-maleic anhydride) -polyphenylene ether graft copolymer, Modified polyphenylene ether such as maleic anhydride modified polyphenylene ether, glycidyl methacrylate modified polyphenylene ether, amine modified polyphenylene ether Tel and the like. Among these, modified SPS and modified polyphenylene ether are particularly preferable.

The modified SPS may be the same as the modified SPS described as the component (a '). The modified polyphenylene ether can be obtained by modifying a known polyphenylene ether with a modifier, but the method is not limited to this method as long as it can be used for the purpose of the present invention. The polyphenylene ether is a known compound, and for this purpose, US Pat. Nos. 3,306,874 and 3,306,875 are known.
Nos. 3,257,357 and 3,257,358 can be referred to. Polyphenylene ethers are usually prepared by oxidative coupling reactions to form homopolymers or copolymers in the presence of copper amine complexes, one or more di- or tri-substituted phenols. Here, the copper amine complex may be a copper amine complex derived from primary, secondary and tertiary amines. 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).

Also suitable are copolymers, such as copolymers derived from two or more of the phenolic compounds used, for example, in the preparation of said homopolymers. Further examples include graft copolymers and block copolymers of vinyl aromatic compounds such as polystyrene and the above-mentioned polyphenylene ether. Of these, poly (2,6-dimethyl-1,4-phenylene ether) is particularly preferably used. As the modifier used for modifying these polyphenylene ethers, compounds having an ethylenic double bond and a polar group in the same molecule can be used. Examples of such modifiers include maleic anhydride, maleic acid, maleic acid ester, maleimide and its N-substituted product, maleic acid salt, fumaric acid, acrylic acid,
Examples thereof include acrylic acid ester, acrylic acid amide, acrylic acid salt, methacrylic acid, methacrylic acid ester, methacrylic acid amide, methacrylic acid salt and glycidyl methacrylate. Among these, maleic anhydride, fumaric acid and glycidyl methacrylate are particularly preferable. It is preferably used. These modifiers may be used alone or in combination of two or more.

The modified polyphenylene ether can be obtained, for example, by reacting the above polyphenylene ether with a modifying agent in the presence of a solvent or another resin. The modification method is not particularly limited, and a known method, for example, a roll mill, a Banbury mixer, an extruder, etc.
A method of melt-kneading at a temperature in the range of 50 ° C. and reacting, or a method of heating and reacting in a solvent such as benzene, toluene or xylene can be used. Furthermore, in order to facilitate these reactions, benzoyl peroxide, di-t-butyl peroxide, dicumyl peroxide, t-butyl peroxybenzoate, azobisisobutyronitrile, azobisisovalero are added to the reaction system. The presence of a radical generator such as nitrile or 2,3-diphenyl-2,3-dimethylbutane is effective. A preferable method is a method of melt-kneading in the presence of a radical generator. Among these modified polyphenylene ethers, maleic anhydride modified polyphenylene ether or fumaric acid modified polyphenylene ether is preferably used.

The compatibilizer as the component (d) may be used alone or in combination of two or more kinds.
The polar group content in the component (d) is preferably 0.01 to 20% by weight, and more preferably 0.05 to 10% by weight. If this content is less than 0.01% by weight, it is necessary to add a large amount of component (d) in order to exert the effect as a compatibilizer, and as a result, the mechanical properties and heat resistance of the composition deteriorate, Not preferable. Further, if it exceeds 20% by weight, the compatibility with the component (a) or the component (a ′) decreases, which is not preferable. The blending amount of the component (d) is selected in the range of 0.1 to 10% by weight, preferably 0.5 to 8% by weight, based on the total weight of the resin component. If the amount is less than 0.1% by weight, the effect as a compatibilizer is not sufficiently exerted, resulting in poor dispersion and insufficient interfacial strength. If it exceeds 10% by weight, the heat resistance of the composition is remarkably reduced. .

An inorganic filler may be added to the above resin composition as the component (e) for the purpose of further improving the elastic modulus and heat resistance of the resin composition. The shape of the inorganic filler is not particularly limited and may be fibrous, granular or powdery. Examples of the fibrous filler include glass fiber, carbon fiber, whiskers, and the like, and the shapes include cloth, mat, focused cut, short fiber, filament, and whiskers. The length is preferably 0.05 to 50 mm and the fiber diameter is 5 to 20 μm. 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, calcium oxysulfate,
Examples thereof include tin oxide, alumina, kaolin, silicon carbide, metal powder, glass powder, glass flakes and glass beads. Among these fillers, glass fillers such as glass powder, glass flakes, glass beads, glass filaments, glass fibers, glass rovings, and glass mats are particularly preferable.

The filler is preferably surface-treated with a coupling agent. The coupling agent used for the surface treatment is used to improve the adhesiveness between the filler and the resin, and is selected from conventionally known ones such as so-called silane coupling agents and titanium coupling agents. Any one can be selected and used. Among them, γ-aminopropyltrimethoxysilane, N-β- (aminomethyl) -γ-aminopropyltrimethoxysilane, γ-glycidoxypropyltrimethoxysilane, β- (3,4-epoxycyclohexyl)
Aminosilanes such as ethyltrimethoxysilane, epoxysilanes, and isopropyltri (N-amidoethyl, aminoethyl) titanate are preferred.

The above-mentioned inorganic filler may be used alone or in combination of two or more kinds, and the compounding amount thereof is 1 to 350 parts by weight with respect to 100 parts by weight of the resin composition.
It is preferably selected in the range of 5 to 200 parts by weight. If the blending amount is less than 1 part by weight, a sufficient blending effect as a filler cannot be exhibited, and if it exceeds 350 parts by weight, dispersibility is poor and molding becomes difficult. In addition, the resin composition of the present invention contains various additive components such as an antioxidant, a nucleating agent, a plasticizer, a release agent, a flame retardant, a pigment, carbon black, an electrostatic charge as long as the object of the present invention is not impaired. Additives such as inhibitors, or other thermoplastic resins can be blended. By using the resin composition of the present invention, a molded article having excellent physical properties can be obtained regardless of the molding method. Examples thereof include injection-molded products, extrusion-molded sheets and films, extrusion-molded and thermoformed containers and trays, extrusion-molded and stretched uniaxially and biaxially stretched films and sheets, and spun fiber-shaped molded products.

In the resin composition of the present invention, it is necessary that the viscosity of each component has the following relationship. That is, in each of the resin compositions (1), (2), (4) and (6), the viscosity of the component (a) or the component (a ') is larger than that of the component (b), and Resin composition (3),
As in each of (5) and (7), (a)
The viscosity of the component or the component (a ′) and the viscosity of the component (c) are both higher than the viscosity of the component (b). Here, the viscosity is obtained by measurement according to JIS-K7199, and means a value at 300 ° C. at a shear rate of 10 ³ sec ⁻¹ . If the above relationship is not satisfied, the falling weight impact strength becomes insufficient and the surface appearance is impaired, which is not preferable.

[0031]

EXAMPLES The present invention will be described in more detail by way of examples, which should not be construed as limiting the invention thereto. Production Example 1 1.0 liter of purified styrene was added to a 2 liter reaction vessel.
After adding 1.5 mmol of triethylaluminum and heating to 80 ° C., a premixed catalyst [pentamethylcyclopentadienyl titanium trimethoxide 90 micromol, dimethylanilinium tetrakis (pentafluorophenyl) borate 90 micromol, toluene 29 0.1 mmol, triisobutylaluminum 1.8 mmol] 16.5
After adding milliliter, polymerization was carried out at 85 ° C. for 5 hours.
After the reaction was completed, the product was repeatedly washed with methanol and dried to obtain 360 g of a polymer. The weight average molecular weight of this polymer is 1,2,4-trichlorobenzene as a solvent,
It was 260000 as measured by gel permeation chromatography at 130 ° C. The weight average molecular weight / number average molecular weight was 2.60. further,
According to melting point and ¹³ C-NMR measurement, this polymer was found to be SPS.
Was confirmed. The viscosity of this polymer is 15
It was 0 (Pa · s).

Production Example 2 0.9 liter of purified styrene was added to a 2 liter reaction vessel.
After adding 0.1 liter of p-methylstyrene and 1 mmol of triethylaluminum and heating to 80 ° C., a premixed catalyst [pentamethylcyclopentadienyl titanium trimethoxide 90 μmol, dimethylanilinium tetrakis (pentafluorophenyl)] was added. 90 micromoles of borate, 29.1 mmol of toluene, 1.8 mmol of triisobutylaluminum] 16.5 ml were added, and polymerization was carried out at 80 ° C. for 5 hours. After the reaction was completed, the product was repeatedly washed with methanol and dried to obtain a polymer 390.
g was obtained. The weight average molecular weight of this polymer is 1, 2, 4
-Measured by gel permeation chromatography at 130 ° C using trichlorobenzene as a solvent,
It was 320,000. The weight average molecular weight / number average molecular weight was 2.60. In addition, melting point and ¹³ C-NM
By R measurement, it was confirmed that this polymer was SPS and contained 12 mol% of p-methylstyrene unit. The viscosity of this polymer was 180 (Pa · s).

Production Example 3 Styrene-p-methylstyrene copolymer of Production Example 2 (p
-Methylstyrene unit content 12 mol%) 1 kg, maleic anhydride 30 g, 10 g of 2,3-dimethyl-2,3-diphenylbutane [NOFMER BC, trade name] manufactured by NOF CORPORATION as a radical generator And then 30
Screw rotation speed of 200 rp using mm twin screw extruder
Melt kneading was performed at m and a set temperature of 300 ° C. At this time, the resin temperature was about 330 ° C. The strand was cooled and then pelletized to obtain maleic anhydride-modified SPS. The modified SPS (1 g) thus obtained was dissolved in ethylbenzene and then reprecipitated in methanol, the recovered polymer was subjected to Soxhlet extraction with methanol, and after drying, the modification ratio was determined by carbonyl absorption intensity of IR spectrum and titration. At this time, the modification rate was 1.05% by weight.

Production Example 4 1 kg of polyphenylene ether (intrinsic viscosity 0.47 deciliter / g, in chloroform, 25 ° C.), maleic anhydride 60 g, 2,3-dimethyl-as a radical generator
Dry blend of 10 g of 2,3-diphenylbutane [NOFMER BC, trade name] manufactured by NOF CORPORATION, 30 mm
Melt kneading was performed using a twin screw extruder at a screw rotation speed of 200 rpm and a set temperature of 300 ° C. At this time, the resin temperature was about 330 ° C. The strand was cooled and then pelletized to obtain maleic anhydride-modified polyphenylene ether (modified PPO). 1 g of the obtained modified polyphenylene ether was dissolved in ethylbenzene and then reprecipitated in methanol,
Soxhlet extraction of the recovered polymer with methanol,
After drying, the modification rate was determined by the intensity of carbonyl absorption in the IR spectrum and titration. At this time, the modification rate was 2.0% by weight.

Production Example 5 1.0 liter of purified styrene was added to a 2 liter reaction vessel.
After adding 2 mmol of triethylaluminum and heating to 80 ° C., a premixed catalyst [pentamethylcyclopentadienyl titanium trimethoxide 90 micromol, dimethylanilinium tetrakis (pentafluorophenyl) borate 90 micromol, toluene 29.1] was added. Mmol, triisobutylaluminum 1.8 mmol] 16.5
After adding milliliter, polymerization was carried out at 90 ° C. for 5 hours.
After the reaction was completed, the product was repeatedly washed with methanol and dried to obtain 340 g of a polymer. The weight average molecular weight of this polymer is 1,2,4-trichlorobenzene as a solvent,
It was 200,000 when measured by gel permeation chromatography at 130 ° C. The weight average molecular weight / number average molecular weight was 2.60. further,
According to melting point and ¹³ C-NMR measurement, this polymer was found to be SPS.
Was confirmed. The viscosity of this polymer is 95
(Pa · s). The above viscosities are all JIS
-Measured according to K7199, temperature 300
℃, shear rate 10 ³ sec ^-1 , L / D of capillary
It is a value under the condition of (length / diameter) = 40.

Example 1 SPS of Production Example 1 (weight average molecular weight 260,000, viscosity 150 (Pa · s)) 28.2 wt%, polyamide 66
[Ube Industries, Ltd., 2020B, trade name, viscosity 120
(Pa · s)] 70 wt%, 1.8 wt% maleic anhydride-modified polyphenylene ether of Production Example 4 as a compatibilizer
As a total of 100 parts by weight of (2,6
-Di-t-butyl-4-methylphenyl) pentaerythritol diphosphite (manufactured by ADEKA ARGUS CORPORATION, PE
P-36, trade name) 0.1 parts by weight, tetrakis [methylene-3- (3 ', 5'-di-t-butyl-4'-hydroxyphenyl)] propionate (manufactured by Adeka Argus Co., MARK AO60, Product name] Add 0.1 parts by weight,
After dry blending with a Henschel mixer, melt kneading was performed with a twin-screw extruder to form pellets. Injection molding was performed using the obtained pellets to obtain a square plate. The drop weight impact strength was measured using the obtained test piece. Also,
The surface appearance and morphology were observed. The results are shown in Table 1.

Example 2 SPS of Production Example 1 (weight average molecular weight 320,000, viscosity 180 (Pa · s)) 28.2 wt%, polyamide 66
[Ube Industries, Ltd., 2015B, trade name, viscosity 60
(Pa · s)] The same operation as in Example 1 was performed except that 70 wt% was used. The results are shown in Table 1.

Example 3 The procedure of Example 1 was repeated, except that 1.8% by weight of maleic anhydride-modified SPS of Production Example 3 was used as the compatibilizing agent of the component (d). The results are shown in Table 1.

Comparative Example 1 SPS of Production Example 5 (weight average molecular weight 200,000, viscosity 95 (Pa · s)) 28.2 wt%, polyamide 66 [manufactured by Ube Industries, Ltd., 2020B, trade name, viscosity 120 ( P
a · s)] The same operation as in Example 1 was carried out except that 70 wt% was used. The results are shown in Table 1.

Comparative Example 2 Polyamide 66 (Ube Industries, Ltd.) was used as the component (b).
Made, 2026B, trade name, viscosity 200 (Pa · s)] 7
Example 2 was carried out in the same manner as in Example 2 except that 0 wt% was used. The results are shown in Table 1.

[0041]

[Table 1]

[0042]

[Table 2]

As is clear from Table 1, the shear rate is 10
^{By making} the viscosity of the SPS domain at ³ sec ^-1 larger than that of the polyamide 66 matrix, it is possible to obtain a resin composition having a significantly improved surface appearance.

Example 4 SPS of Production Example 1 (weight average molecular weight 320,000, viscosity 180 (Pa · s)) 22.2 wt%, polyamide 66
[Ube Industries, Ltd., 2015B, trade name, viscosity 60
(Pa · s)] 70 wt%, maleic anhydride-modified SEBS as a rubber-like elastic body having a polar group (Asahi Kasei Corporation)
Made, M1943, viscosity 90 (Pa · s)) 8.0 wt%,
As a compatibilizer, a total of 100 parts by weight of 1.8 wt% of maleic anhydride-modified polyphenylene ether of Production Example 4,
As an antioxidant, (2,6-di-t-butyl-4-methylphenyl) pentaerythritol diphosphite (manufactured by ADEKA ARGUS CORPORATION, PEP-36, trade name) 0.1 part by weight, tetrakis [methylene-3 -(3 ', 5'-di-t
-Butyl-4'-hydroxyphenyl)] propionate (manufactured by ADEKA ARGUS CORPORATION, MARK AO60, trade name] 0.1 part by weight was added, and after dry blending with a Henschel mixer, melt kneading with a twin-screw extruder. And then
Pelletized. Injection molding was performed using the obtained pellets to obtain a square plate. The drop weight impact strength was measured using the obtained test piece. The surface appearance and morphology were also observed. The results are shown in Table 2.

Example 5 The procedure of Example 4 was repeated, except that 1.8% by weight of maleic anhydride-modified SPS of Production Example 3 was used as the compatibilizing agent of the component (d). The results are shown in Table 2.

Comparative Example 3 Polyamide 66 (Ube Industries, Ltd.) was used as the component (b).
Made, 2026B, trade name, viscosity 200 (Pa · s)] 7
The same procedure as in Example 4 was performed except that 0 wt% was used. The results are shown in Table 2.

[0047]

[Table 3]

[0048]

[Table 4]

As is clear from Table 2, the shear rate is 10
^{By making} the viscosity of the SPS domain at ³ sec ^-1 larger than the viscosity of the polyamide 66 matrix, it is possible to obtain a resin composition with significantly improved drop weight impact strength and surface appearance.

Example 6 SPS of Production Example 1 (weight average molecular weight 260,000, viscosity 150 (Pa · s)) 22.2 wt%, polyamide 66
[Ube Industries, Ltd., 2020B, trade name, viscosity 120
(Pa · s)] 70 wt%, maleic anhydride-modified SEBS as a rubber-like elastic body having a polar group (Asahi Kasei Corporation)
Made, MX072, viscosity 220 (Pa · s)) 6.0wt
%, And 1.8 wt% of the maleic anhydride-modified polyphenylene ether of Production Example 4 as a compatibilizing agent in total of 100 parts by weight, (2,6-di-t-butyl-4-
Methylphenyl) pentaerythritol diphosphite (manufactured by ADEKA ARGUS CORPORATION, PEP-36, trade name) 0.1
Parts by weight, tetrakis [methylene-3- (3 ', 5'-di-t-butyl-4'-hydroxyphenyl)] propionate (manufactured by Adeka Argus, MARK AO60,
Brand name] 0.1 part by weight was added, dry blending was performed with a Henschel mixer, and then melt kneading was performed with a twin-screw extruder to form pellets. Injection molding was performed using the obtained pellets to obtain a square plate. The drop weight impact strength was measured using the obtained test piece. The surface appearance and morphology were also observed. The results are shown in Table 3.

Example 7 Example 6 was carried out in the same manner as in Example 6 except that 1.8% by weight of maleic anhydride-modified SPS of Production Example 3 was used as the compatibilizing agent of the component (d). The results are shown in Table 3.

Example 8 SPS of Production Example 1 (weight average molecular weight 320,000, viscosity 180 (Pa · s)) 37.0 wt%, polyamide 66
[Ube Industries, Ltd., 2015B, trade name, viscosity 60
(Pa · s)] 50 wt%, maleic anhydride-modified SEBS (MX072, manufactured by Asahi Kasei Corporation) as a rubber-like elastic material
A viscosity of 220 (Pa · s)) 10 wt% and a maleic anhydride-modified polyphenylene ether 3.0 wt% are used.
It carried out like Example 6. The results are shown in Table 3.

[0053]

[Table 5]

[0054]

[Table 6]

[0055]

[Table 7]

As is apparent from Table 3, the shear rate is 10
^{By making} the viscosity of the SPS domain and / or the rubber-like elastic resistance at ³ sec ^-1 larger than that of the polyamide 66 matrix, it is possible to obtain a resin composition in which falling weight impact strength and surface appearance are remarkably improved.

[0057]

EFFECTS OF THE INVENTION According to the present invention, it has excellent rigidity, heat resistance, impact resistance, water resistance, etc., and has improved water absorption and physical property change at the time of water absorption, drop weight impact strength, weld strength and surface appearance. The syndiotactic polystyrene-based resin composition is obtained. The polystyrene resin composition of the present invention,
Suitable as a material for industrial materials such as electrical and electronic materials (connectors, printed boards, etc.), industrial structural materials, automobile parts (vehicle-mounted connectors, wheel caps, cylinder head covers, etc.), home appliances, various machine parts, etc. Used.

Claims (8)

[Claims] 1. (a) 1 to 60% by weight of a styrene-based polymer having a syndiotactic structure, (b) 95 to 40% by weight of a thermoplastic resin having a reactive polar group, and (d).
A compatibilizer having compatibility with the component (a) and having a polar group capable of reacting with the component (b), which comprises 0.1 to 10% by weight, and is 300 ° C. at a shear rate of 10 ³ sec ^−1. The viscosity of (a) in (2) is larger than the viscosity of (b). 2. (a) 1 to 60% by weight of a styrene polymer having a syndiotactic structure, (b) 95 to 40% by weight of a thermoplastic resin having a reactive polar group, (c)
1 to 50% by weight of a rubber-like elastic body having a polar group capable of reacting with the component (b) and having a compatible part with the component (a), and (d) having compatibility with the component (a). And a compatibilizer having a polar group capable of reacting with the component (b) in an amount of 0.1 to 10% by weight, and having a viscosity (a) at 300 ° C. at a shear rate of 10 ³ sec ⁻¹ (b). A polystyrene-based resin composition having a viscosity higher than the above. 3. (a) 1 to 60% by weight of a styrene polymer having a syndiotactic structure, (b) 95 to 40% by weight of a thermoplastic resin having a reactive polar group, (c)
1 to 50% by weight of a rubber-like elastic body having a polar group capable of reacting with the component (b) and having a compatible part with the component (a), and (d) having compatibility with the component (a). And a compatibilizer having a polar group capable of reacting with the component (b) in an amount of 0.1 to 10% by weight, and having a viscosity of (a) at 300 ° C. at a shear rate of 10 ³ sec ⁻¹ and (c). The polystyrene-based resin composition, wherein the viscosity of each is greater than the viscosity of (b). 4. A styrene polymer having a modified syndiotactic structure having a polar group capable of reacting with the components (a ′) and (b) in an amount of 1 to 60% by weight, and (b) a thermoplastic resin having a reactive polar group. 95 to 40% by weight of a resin, and 1 to 50% by weight of a rubber-like elastic body having a polar group capable of reacting with the components (c) and (b) and having a compatible part with the component (a '), 10 ³
A polystyrene resin composition, wherein the viscosity of (a ′) at 300 ° C. at a shear rate of sec ⁻¹ is larger than the viscosity of (b). 5. 1 to 60% by weight of a styrene polymer having a modified syndiotactic structure having a polar group capable of reacting with the components (a ′) and (b), and (b) a thermoplastic resin having a reactive polar group. 95 to 40% by weight of a resin, and 1 to 50% by weight of a rubber-like elastic body having a polar group capable of reacting with the components (c) and (b) and having a compatible part with the component (a '), 10 ³
A polystyrene resin composition, wherein the viscosity of (a ′) and the viscosity of (c) at 300 ° C. at a shear rate of sec ⁻¹ are respectively larger than the viscosity of (b). 6. A styrene polymer having a syndiotactic structure having a polar group capable of reacting with the components (a ′) and (b) 1 to 60% by weight, and (b) a thermoplastic resin having a reactive polar group. 95 to 40% by weight, 1 to 50% by weight of a rubber-like elastic body having a polar group capable of reacting with the components (c) and (b) and having a compatible part with the component (a '), and (d) A compatibilizing agent having a polar group capable of reacting with the component (b) and having a compatibility with the component (a ') is 0.1 to 10% by weight and comprises 10 ³ se.
A polystyrene resin composition, wherein the viscosity of (a ′) at 300 ° C. at a shear rate of c ⁻¹ is larger than the viscosity of (b). 7. A styrene polymer having a syndiotactic structure having a polar group capable of reacting with the components (a ′) and (b) 1 to 60% by weight, and (b) a thermoplastic resin having a reactive polar group. 95 to 40% by weight, 1 to 50% by weight of a rubber-like elastic body having a polar group capable of reacting with the components (c) and (b) and having a compatible part with the component (a '), and (d) A compatibilizing agent having a polar group capable of reacting with the component (b) and having a compatibility with the component (a ') is 0.1 to 10% by weight and comprises 10 ³ se.
A polystyrene resin composition, wherein the viscosity of (c) and the viscosity of (a ′) at 300 ° C. at a shear rate of c ⁻¹ are higher than the viscosity of (b). 8. The inorganic fillers (e) 1 to 350 relative to 100 parts by weight of the resin composition according to claim 1.
A polystyrene resin composition containing 1 part by weight.