Blend of styrene copolymer with a graft-copolymer of styrene and a nitrile upon an alkyl acrylate polymer

Claim 1

AN INITMATE FUSION BLEND OF (A) AT LEAST ONE RIGID INTERPOLYMER OF 50-90% BY WEIGHT OF A CHEMICALLYCOMBINED MONOVINYLIDENE AROMATIC HYDROCARBON OF THE GROUP CONSISTING OF STYRENE, A RING-ALKYL-STYRENE, AN ALPHAALKYLSTYRENE, AN ALPHA-ALKYL-RING-ALKYLSTYRENE, AND MIXTURES THEREOF AND 50-100% BY WEIGHT OF A CHEMICALLYCOMBINED ACRYLIC COMPOUND OF THE GROUP CONSISTING OF ACRYKONITRILE, METHACRYLONITRILE, AN ALKYL METHACRYLATE WHEREIN THE ALKYL RADICAL CONTAINS 1-4 CARBON ATOMS, AND MIXTURES THEREOF AND (B) A GRAFT COPOLYMER PREPARED BY POLYMERIZING ABOUT 20-200 PARTS BY WEIGHT OF A MIXTURE CONSISTING OF ABOUT 50-90% BY WEIGHT OF A MONOVINYLIDENE AROMATIC HYDROCARBON OF THE GROUP CONSISTING OF STYRENE, A RING-ALKYLSTYRENE, AN ALPHA-ALKYLSTYRENE, AN ALPHA-ALKYL-RING-ALKYLSTYRENE, AND MIXTURES THEREOF AND ABOUT 50-10% BY WEIGHT OF A MONOMER OF THE GROUP CONSISTING OF ACRYLONITRILE, METHACRYLONITRILE, AND MIXTURES THEREOF IN AN AQUEOUS DISPERSION CONTAINING 100 PARTS OF WEIGHT OF A RUBBERY ACRYLATE POLYMER WHICH CONSISTS OF 80-100% BY WEIGHT OF A CHEMICALLY-COMBINED ALKYL ACRYLATE WHEREIN THE ALKYL RADICAL CONTAINS 2-18 CARBON ATOMS AND UP TO 20% BY WEIGHT OF A CHEMICALLYCOMBINED INTERPOLYMERIZABLE MONOVINYLIDENE MONOMER; SAID COMPONENETS A AND B BEING SO PROPORTIONED THAT THE RUBBERY ACRYLATE POLYMER SUBSTRATE OF THE GRAFT COPOLYMER CONSTITUTES ABOUT 5-40% BY WEIGHT OF THE BLEND.