Polymer alloys of rubber modified acrylic multipolymers, and polycarbonates; and methods of making the same

Abstract

Commercially available solid rubber modified acrylic multipolymers and polycarbonate polymer are tumble blended and melted and extruded through an extruder. Resulting alloys comprise an unsaturated rubber such as polybutadiene grafted with methylmethacrylate and styrene; a multipolymer comprising methylmethacrylate and styrene, and acrylonitrile, ethylacrylate, or methylacrylate; and polycarbonate. The ratio of rubber to graft monomers ranges from about 1:1 to about 6:1 and is preferably about 3:1. Graft monomers comprise from about 60 to about 85 parts methylmethacrylate, about 15 to about 30 parts styrene, and up to about 15 parts methylacrylate, ethylacrylate, or acrylonitrile. The multipolymer comprises from about 60 to about 80 parts of methylmethacrylate, about 15 to about 30 parts of styrene, and up to 15 parts of methylacrylate, ethylacrylate, or acrylonitrile. The ratio of graft rubber to multipolymer ranges from about 5:95 to about 25:75. The ratio of graft rubber and multipolymer to polycarbonate ranges from about 20:80 to about 80:20. The rubber in the acrylic multipolymers preferably comprises about 14 percent by weight thereof.

Dependencies are inferred from the claim text.