The Standard Oil Company

David A Woodhead

Christopher L Bodolus

Rubber-modified thermoplastic resins are characterized by having a high content of olefinically unsaturated nitriles and good transparency. These thermoplastic resins generally comprise from about 43 to about 75 parts by weight of a monovinyl aromatic monomer, from about 20 to about 40 parts by weight of an olefinically unsaturated nitrile monomer and from about five to about 35 parts by weight of an unsaturated dicarboxylic acid anhydride monomer, providing 100 parts of a thermoplastic terpolymer, and from about two to about 30 parts by weight of rubber polymer per 100 parts of the thermoplastic terpolymer. Other resins characterized by having between about 30 to 45 parts by weight of unsaturated dicarboxylic acid anhydride exhibit good heat distortion temperatures.

Novel rubber-modified thermoplastic resin compositions

A process for the preparation of rubber-modified thermoplastic compositions having high temperature stability includes the steps of dissolving a rubber polymer in a solvent selected from the group consisting of monovinyl aromatic monomers, olefinically unsaturated nitriles and mixtures thereof to form a feed solution, introducing the feed solution into a reactor capable of intimately mixing multiple immiscible phases, introducing into the reactor a separate liquid monomer feed stream containing monomers selected from the group consisting of unsaturated dicarboxylic acid anhydrides, olefinically unsaturated nitriles and mixtures thereof, heating the feed solution and feed stream under pressure to a temperature sufficient for polymerization to begin and intimately mixing and polymerizing the monomers around the rubber polymer in the reactor to form a thermoplastic resin composition. The rubber-modified thermoplastic resins produced by this process are novel and are characterized by having a high content of either olefinically unsaturated nitriles or unsaturated dicarboxylic acid anhydrides and high heat distortion temperatures. These thermoplastic resins generally comprise from about 45 to about 75 parts by weight of a monovinyl aromatic monomer, from about 10 to about 35 parts by weight of an olefinically unsaturated nitrile monomer and from about five to about 45 parts by weight of an unsaturated dicarboxylic acid anhydride monomer, providing 100 parts of a thermoplastic copolymer, and from about two to about 30 parts by weight of rubber polymer per 100 parts of the thermoplastic copolymer.

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Bainbridge, OH, United States of America

David A Woodhead