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

Claim 1

AN INTIMATE FUSION BLEND OF (A) AT LEAST ONE RIGID POLYMER OF 60-100% BY WEIGHT OF CHEMICALLY-COMBINED MONOMER OF THE GROUP CONSISTING OF STYRENE, A RING-ALKYLSTYRENE, AND MIXTURES THEREOF AND UP TO 40% BY WEIGHT OF A CHEMICALLY-COMBINED MONOMER OF THE GROUP CONSISTING OF AN ALPHA-ALKYLSTYRENE, AND ALPHA-ALKYL-RINGALKYLSTYRENE, A MONOOLEFIN CONTAINING 2-4 CARBON ATOMS, A 1,3-ACYCLIC DIENE HYDROCARBON, AND MIXTURES THEREOF AND (B) A GRAFT COPOLYMER PREPARED BY POLYMERIZING ABOUT 50-400 PARTS OF WEIGHT OF A MONOMER CHARGE CONSISTING OF ABOUT 70-100% BY WEIGHT OF A MONOMER OF THE GROUP CONSISTING OF STYRENE, A RING-ALKYLSTYRENE, AND MIXTURES THEREOF AND UP TO 30% BY WEIGHT OF A MONOMER OF THE GROUP CONSISTING OF AN ALPHA-ALKYLSTRENE, A ALPHA-ALKYLRING-ALKYLSTYRENE, A 1,3-ACYCLIC DIENE HYDROCARBON, AND MIXTURES THEREOF IN AN AQUEOUS DISPERSION CONTAINING 100 PARTS BY 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 CHEMICALLY COMBINED DIFFERENT MONOVINYLIDENE MONOMER; SAID COMPONENTS A AND B BEING SO PROPORTIONED THAT THE RUBBERY ACRYLATE POLYMER SUBSTRATE OF THE GRAFT COPOLYMER CONSTITUTEES ABOUT 5-40% BY WEIGHT OF THE BLEND.