Thermoplastic molding materials

US4430478A · kind A · utility

Inventors

• Burghard Schmitt · Worms, DE
• Klaus Benker · Neustadt, DE
• Edmund Priebe · Bischofswerda, DE
• Gerhard Lindenschmidt · Leimen, DE

Key dates

• Filing date: Nov 12, 1981
• Grant date: Feb 7, 1984
• Expiry date: Nov 12, 2001

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08L2205/02
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

A thermoplastic molding material which contains two graft copolymers in a matrix of a copolymer based on styrene and acrylonitrile. The first graft copolymer (B) comprising a hard phase prepared from one or more vinyl-aromatic monomers and an elastomer phase, the elastomer phase particles having a diameter of from 0.5 to 5 .mu.m. The second graft copolymer (C) comprising a hard phase and an elastomer phase, said elastomer phase having a bimodal particle distribution in which the diameter of one category of particles is from 0.05 to 0.18 .mu.m and the second category of particles has a mean diameter of from 0.25 to 0.6 .mu.m.