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

Claim 1

AN INTIMATE FUSION BLEND OF (A) AT LEAST ONE RIGID INTERPOLYMER MONOVINYLIDENE AROMATIC HYDROCARBON OF THE COMBINED MONOVINYLIDENE AROMATIC HYDROCARBON OF THE GROUP CONSISTING OF STYRENE, A RING-ALKYLSTYRENE, AN ALPHAALKYLSTYRENE, AN ALPHA-ALKYL-RING-ALKYLSTYRENE, AND MIXTURES THEREOF AND 50-10% BY WEIGHT OF A CHEMICALLY COMBINED ACRYLIC COMPOUND OF THE GROUP CONSISTING OF ACRYLONITRILE, METHACRYLONITRILE, AND ALKYL METHACRYLATE WHEREIN THE ALKYL RADICAL CONTAINS 1-4 CARBON ATOMS AND MIXTURES THEREOF AND (B) AND GRAFT COPOLYMER PREPARED BY POLYMERIZING ABOUT 20-200 PARTS BY WEIGHT OF A MONOMER CHARGE CONSISTING OF ABOUT 50-100% BY WEIGHT OF AT LEAST ONE ALKYL METHYACRYLATE WHEREIN THE ALKYL RADICAL CONTAIN 1-4 CARBON ATOMS, UP TO ABOUT 50% BY WEIGHT OF A MONOMER OF THE GROUP CONSISTING OF ACRYLONITRILE, METHYACRYLONITRILE, AND MIXTURES THEREOF, AND UP TO ABOUT 20% BY WEIGHT OF A DIFFERENT INTERPOLYMERIZABLE MONOVINYLIDENE MONOMER IN AN AQUEOUS DISPERSION CONTAINGING 100 PARTS BY WEIGHT OF A RUBBERY ACRYLATE POLYMER WHICH CONSISTIS 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 CHEMICALLY-COMBINED INTERPOLYMERIZABLE MONOVINYLIDENE MONMER; SAID COMPONENTS 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.