Impact-resistant polyoxymethylene molding materials and their preparation

US4639488A · kind A · utility

Assignee

• BASF SE

Inventors

• Wilhelm Schuette · Speyer, DE
• Graham E. McKee · Ludwigshafen, DE
• Albrecht Hilt · Ludwigshafen, DE
• Gerhard Heinz · Bad Dürkheim, DE
• Heiner Goerrissen · Ludwigshafen, DE

Key dates

• Filing date: Nov 5, 1985
• Grant date: Jan 27, 1987
• Expiry date: Nov 5, 2005

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10S525/902
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

Impact-resistant polyoxymethylene molding materials containing PA1 (A) from 30 to 95% by weight of one or more polyoxymethylenes and PA1 (B) from 5 to 70% by weight of one or more elastomeric graft polymers which are prepared by emulsion polymerization, are dispersed in component A, have a mean particle diameter of from 0.08 to 2 .mu.m and are composed of PA2 1. from 60 to 90% by weight of a grafting base of crosslinked polybutadiene in which not more than 30% by weight of the butadiene may be replaced with isoprene, 2,3-dimethylbutadiene, styrene, p-methylstyrene, .alpha.-methylstyrene and/or (meth)acrylonitrile, and PA2 2. from 10 to 40% by weight of one or more grafted shells consisting of polymers of styrene and/or methyl methacrylate, in which not more than 15% by weight of the said monomers 2 may be replaced with acrylonitrile or a C.sub.1 -C.sub.8 -alkyl acrylate, the percentages A and B and the percentages 1 and 2 summing to 100, with or without PA1 (C) effective amounts of assistants, and a process for their preparation.