Abstract: This invention relates to a rubber-reinforced polystyrene composition having a rubbery polymer dispersed in the form of particles therein, characterized in that:(A) the particles have an area-averaged particle diameter in the range of 0.20 to 1.00 micron,(B) the dispersed particles of rubbery substance have polystyrene included in the form of minute particles therein and not less than 80% of the total number of the polystyrene particles have diameters of not more than 0.3 micron, and(C) the composition contains polydimethyl siloxane in an amount falling in the range of 0.005 to 0.8% by weight.The resin composition of this invention is superior in appearance such as coloring and gloss and has balanced properties of impact resistance and rigidity. Excellent coloring represents a profound commercial significance in that the cost of dye and pigment to be used for the coloring can be appreciably saved.

Abstract: A polyphenylene ether resin composition comprising a polyphenylene ether resin and a rubber-reinforced styrenic resin, said composition containing rubber particles dispersed therein, which particles having a distribution of sizes such that there are at least one maximal value at 1.5.mu. or less and at least one maximal value at 2 to 3.mu. in volume fraction of the sizes, with the ratio of the former maximal value to the latter maximal value being within the range of from 1/4 to 4/1, and substantially no rubber particles having a size of 3.mu. or larger exist. The composition can be used widely for uses such as industrial parts, electrical parts, office instrument housing, automobile parts, precision parts, etc.

Abstract: A polymeric material which is superior in mechanical strength, dimensional stability, moldability and resistances to chemicals, heat and abrasion comprises a copolymer composed of polymer chain moieties of a copolymer containing an imide compound of an .alpha.,.beta.-unsaturated dicarboxylic acid and polymer chain moieties of a polyamide, both chain moieties being bonded to each other. The material may be blended with thermoplastic resins. Furthermore, the material may be reinforced with glass fiber, etc.

Abstract: A heat resistant thermoplastic resin composition improved in working fluidity while keeping the characteristics of aromatic polyether resins such as heat resistance and solvent cracking resistance. This composition comprises 100 parts by weight of an aromatic polyether resin or a mixed resin of an aromatic polyether resin and a styrene resin and 0.1 to 10 parts by weight of a polyhydric alcohol fatty acid ester having at least one --OH group. This ester preferably has a molecular weight of at least 200.

Abstract: A thermoplastic polymeric material which is superior in mechanical strength comprises (1) 10 to 65% by weight of a hard copolymer containing as a comonomer an .alpha.,.beta.-unsaturated dicarboxylic acid anhydride and (2) 90 to 35% by weight of a polyamide, which are chemically bonded to each other. The thermoplastic polymeric material has a fine dispersion microstructure. The material may be reinforced by incorporating glass or carbon fibers therein.

Abstract: A thermoplastic resin composition which has high heat resistance, high impact resistance and high molding processability and comprises 5-95% by wt. of a copolymer of a vinyl aromatic compound and an imide compound of an .alpha.,.beta.-unsaturated dicarboxylic acid and 5-95% by wt. of a polyphenylene ether resin together with or without up to 90% by wt. of an impact resistance reinforcing agent.

Abstract: A resin composition suitable for injection moulding and having excellent heat resistance, impact resistance and crack resistance, which is composed of polyphenylene ether and rubber-reinforced styrene resin and an amount of volatile matters in the resin having molecular weight of about 300 or less is 5000 ppm or less. This resin composition is prepared by melting and kneading the two resins above in an extruder with a vent under keeping the vent part under reduced pressure.

Abstract: A highly heat resistant thermoplastic resin composition having high oil-resistance which contains(a) polyphenylene ether resin,(b) a copolymer comprising a vinyl aromatic compound and an .alpha.,.beta.-unsaturated dicarboxylic acid anhydride as components, or a copolymer comprising a vinyl aromatic compound and an imide compound of an .alpha.,.beta.-unsaturated dicarboxylic acid as components, and(c) polyamide,and, if desired,(d) an impact-resistant-reinforcing agent.