Rigid thermoplastic compositions comprising vinyl halide polymers with interpolymersof styrene and alkyl methacrylates and process of making

Claim 1

A THERMOPLASTIC COMPOSITION COMPRISING A HOMOGENEOUS MIXTURE OF A VINYL HALIDE POLYMER OF A MONOMERIC MATERIAL IN WHICH EACH CONSTITUENT CONTAINS A SINGLE OLEFINIC DOUBLE BOND AND WHIC H CONTAINS AT LEAST 50% VINYL HALIDE AND A HARD RESINOUS INTERPOLYMER OF A MONOOLEFINIC MONOMERIC MIXTURE COMPRISING ABOUT 60 TO 40 WEIGHT PERCENT OF A MONOMER SELECTED FROM THE CLASS CONSISTING OF STYRENE, CHLOROSTHRENE, DICHLOROSTYRENE, VINYL TOLUENE, ALPHA-METHYL STYRENE AND METHOXY STYRENE AND FROM ABOUT 40 TO 60 WEIGHT PERCENT OF AN ALKYL METHACRYLATE, SAID HARD RESINOUS INTERPOLYMER CONTAINING LESS THAN 20 WEIGHT PERCENT OF OTHER POLYMERIZED MONOOLEFINIC MONOMERS AND HAVING A MOLECULAR WEIGHT AT LEAST ABOUT 40, 000 SAID COMPOSITION CONTAINING FROM 1 TO 40 WEIGHT PARTS OF SAID HARD RESINOUS INTERPOLYMER BASED ON 100 WEIGHT PARTS OF SAID VINYL HALIDE POLYMER.