Blend of a diene rubber-based graft copolymer, an emulsion-polymerized styrene-acrylonitrile type interpolymer, and a suspension-polymerized styrene-acrylonitrile type interpolymer

Claim 1

A BLEND COMPRISING (A) A SUSPENSION-POLYMERIZED MONOVINYLIDENE AROMATIC COMPOUND-UNSATURATED NITRILE INTERPOLYMER AND (B) A SUB-BLEND OF (1) AN EMULSIONPOLYMERIZED MONOVINYLIDENE AROMATIC COMPOUND-UNSATURATED NITRILE INTERPOLYMER AND (2) A MONOVINYLIDENE AROMATIC COMPOUND-UNSATURATED NITRILE SUPERSTRATE/DIENE RUBBER SUBSTRATE GRAFT COPOLYMER CONTAINING 15-90 PARTS BY WEIGHT OF SUPERSTRATE/100 PARTS BY WEIGHT OF SUBSTRATE AND HAVING AT LEAST 80% OF THE SUPERSTRATE CHEMICALLYCOMBINED WITH THE SUBSTRATE; SAID SUBSTRATE BEING A RUBBERY POLYMER OF 85-100% BY WEIGHT OF A CONJUGATED DIENE OF THE GROUP CONSISTING OF BUTADIENE, ISOPRENE, AND MIXTURES THEREOF AND UP TO 15% BY WEIGHT OF COPOLYMERIZABLE MONOVINYLIDENE MONOMERS; SAID GRAFT COPOLYMER SUPERSTRATE AND COMPONENTS A AND B-1 EACH CONSISTING ESSENTIALLY OF 20-95% BY WEIGHT OF A CHEMICALLYCOMBINED MONOVINYLIDENE AROMATIC COMPOUND OF THE GROUP CONSISTING OF STYRENE, AR-HALOSTYRENES, AR-ALKYLSTYRENES, ALPHA-METHYLSTYRENE, AND MIXTURES THEREOF AND 80-5% BY WEIGHT OF A CHEMICALLY-COMBINED UNSATURATED NITRILE OF THE GROUP CONSISTING OF ACRYLONITRILE, METHACRYLONITRILE, AND MIXTURES THEREOF; THE COMPONENTS OF THE BLEND BEING SO PROPORTIONED THAT THE GRAFT COPOLYMER SUBSTRATE CONSTITUTES 10-50% OF THE WEIGHT OF THE SUB-BLEND AND A LESSER PERCENTAGE IN THE RANGE OF 5-40% OF THE WEIGHT OF THE TOTAL BLEND.