Process for making molding compositions of polystyrene and copolymers of styrene andbutadiene

Claim 1

IN A PROCESS FOR MAKING A MOLDING COMPOSITION COMPRISING AT LEAST ONE THERMOPLASTIC ALKENYL AROMATIC RESIN WHICH IS A MEMBER OF THE GROUP CONSISTING OF POLYMERIZED MONOVINYL AROMATIC HYDROCARBON CONTAINING A SINGLE BENZENE NUCLEUS AND COPOLYMRS OF FROM 70 TO 99 MATIC HYDROCARBON AND FROM 30 TO 1 PERCENT OF AN ALPHAMATIC HYDROCARBON AND FROM 30 TO 1 PERCENT OF AN ALPHAALKYL STYRENE, AND A RUBBER, WHEREIN THE ALKENYL AROMATIC RESIN AND THE RUBBER ARE MECHANICALLY WORKED IN ADMIXTURE WITH ONE ANOTHER AT HEAT-PHASTIFYING TEMPERATURES BETWEEN 150* AND 250* C. TO OBTAIN A UNIFORM COMPOSITION, THE STEPS WHICH CONSIST IN MIXING A POLYETHYLENE GLYCOL HAVING AN AVERAGE MOLECULE WEIGHT OF FROM 200 TO 600 WITH A SYNTHETIC LATEX COMPRISING AT LEAST ONE AQUEOUS COLLODIAL DIPERSION OF A COPOLYMER PREPARED BY THE EMULSION POLYMERIZATION OF A MIXTURE OF FROM 30 TO 70 PERCENT BY WEIGHT OF THE POLYETHYLENE GLYCOL BASED ON OF STYRENE, IN AMOUNT CORRESPONDING TO FROM 0.5 TO 5 PERCENT BY WEIGHT OF THE POLYETHYLENE GLYCOL BASED ON THE WEIGHT OF THE COPOLYMER, DRYING THE LATEX AND INCORPORATING THE LATEX SOLIDS WITH THE HEAT-PLASTIFIED THERMOPLASTIC ALKENYL AROMATIC RESIN IN PROPORTIONS CORRESPONDING TO FROM 15 TO 40 PERCENT BY WEIGHT OF THE LATEX SOLIDS AND FROM 85 TO 60 PERCENT OF THE ALKENYL AROMATIC RESIN.