Abstract: Thermoplastic molding compositions are disclosed which comprise an intimate admixture of (i) from about 5 to about 95 parts by weight of a rubber-modified copolymer of a vinyl aromatic compound and an .alpha.,.beta.-unsaturated cyclic anhydride, (ii) from about 30 to about 1 parts by weight of a block or graft copolymer of a vinyl aromatic compound and a conjugated diene, and (iii) from 0 to about 95 parts by weight of a polyphenylene ether resin.

Abstract: Novel thermoplastic compositions are disclosed which include a polyphenylene ether resin, an alkenyl aromatic resin modified with an EPDM rubber, and a selectively hydrogenated elastomeric block copolymer. Also included within the scope of this invention are reinforced and flame-retardant compositions of said thermoplastic materials.

Abstract: Polyphenylene ether compositions are disclosed which comprise a polyphenylene ether resin and a copolymer of a vinyl aromatic compound and an .alpha., .beta.-unsaturated cyclic anhydride.

Abstract: There are provided high impact strength thermoplastic compositions comprising a polyphenylene ether and a rubber modified polystyrene resin. The compositions include a dispersed phase of rubber particles having a maximum mean diameter of 2 microns and preferably from about 0.5 to 2 microns; the composition contains greater than 22% by weight of a rubber gel phase on a polyphenylene ether-free basis; and the rubber comprises a polybutadiene having a cis-1,4 content of at least 50% by weight and a vinyl content of no more than 10% by weight. The compositions provide molded articles with substantial and unexpected improvements in impact resistance, surface appearance and resistance to aggressive solvent systems and the retention of impact strength at sub-zero temperatures is particularly outstanding.

Abstract: There are provided high impact strength thermoplastic compositions comprising a polyphenylene ether and a rubber modified polystyrene resin having not less than 22% by weight of a dispersed elastomeric gel phase. Such elastomeric particles, when dispersed in a martrix of polyphenylene ether and polystyrene, provide molded articles with substantial and unexpected improvements in impact resistance, surface appearance and resistance to aggressive solvent systems in comparison with known compositions made from rubber modified polystyrenes having dispersed elastomeric gel contents of less than 21% by weight.

Abstract: There are provided high impact strength thermoplastic compositions comprising a polyphenylene ether and a polystyrene resin and rubber of a rubber modified polystryene resin. The compositions include a dispersed elastomeric phase with the dispersed particles having a maximum mean diameter of 2 microns and preferably from about 0.5 to 2 microns. The small elastomeric particles provide molded articles with substantial and unexpected improvements in impact resistance, surface appearance and resistance to aggressive solvent systems in comparison with known compositions having dispersed elastomeric particles of larger than 2 microns in diameter.

Abstract: Novel thermoplastic molding compositions are disclosed which comprise a copolymer of a vinyl aromatic compound with an .alpha.,.beta.-unsaturated cyclic anhydride and a hydrogenated A-B-A block copolymer or a block copolymer of the A'-B'-A' type or an acrylic graft polymerization copolymer with or without a polyphenylene ether resin.

Abstract: There are provided thermoplastic polyphenylene ether resin compositions which comprise, in admixture, a major proportion of the polyphenylene ether resin, a minor proportion of a plasticizer at least sufficient to provide a plasticized composition after molding and poly(1,4-butylene terephthalate) or branched copolyester in an amount sufficient to reduce the melt viscosity of the composition without substantially reducing the heat distortion temperature and ductility properties thereof. In such compositions, there may also be present an A--B--A.sup.1 copolymeric resin as an impact modifier. In preferred instances, where said poly(1,4-butylene terephthalate) is utilized in an amount in excess of about 5% by weight, the compositions will also contain a hydrogenated A--B--A.sup.1 block copolymer.

Abstract: Filled thermoplastic compositions are provided which comprise, in admixture, a polyphenylene ether resin, a styrene resin, a reinforcing amount of a titanate filler and an adipic acid based polyester in an amount at least sufficient to provide enhanced toughness, as measured by impact strength and tensile elongation, in the molded compositions.

Abstract: Novel thermoplastic compositions are disclosed which include a polyphenylene ether resin, an alkenyl aromatic resin modified with an EPDM rubber and an emulsion graft copolymer of an alkenyl aromatic resin and a rubbery interpolymer of a mixture of monoolefins and a polyene; or a graft polymerization product of an acrylic monomer alone or in admixture with styrene and a rubber diene polymer or styrenediene copolymer. Also included with the scope of this invention are reinforced and flame-retardant compositions of said thermoplastic materials.

Abstract: Novel thermoplastic compositions are disclosed which include a polyphenylene ether resin, an alkenyl aromatic resin modified with an EPDM rubber and an emulsion graft copolymer of an alkenyl aromatic resin and a rubbery interpolymer of a mixture of monoolefins and a polyene; or a graft polymerization product of an acrylic monomer alone or in admixture with styrene and a rubbery diene polymer or styrenediene copolymer. Also included with the scope of this invention are reinforced and flame-retardant compositions of said thermoplastic materials.

Abstract: There are provided high impact strength thermoplastic compositions comprising a polyphenylene ether and a rubber modified polystyrene resin, the polystyrene matrix in the composition having an intrinsic viscosity of at least 1.0 deciliters/gram. Such compositions, which contain polystyrene of substantially higher molecular weight than heretofore, provide molded articles with unexpected improvements in impact resistance, surface appearance and resistance to aggressive solvent systems. Also provided are high impact compositions, useful per se or for blending with polyphenylene ethers, comprising polyblends of rubber dispersed in a polystyrene matrix, the polystyrene having an intrinsic viscosity of at least 1.0 deciliters/gram.