Impact-resistant thermoplastic molding material and its use

US5112921A · kind A · utility

Assignee

• BASF SE

Inventors

• Hans-Dieter Schwaben · Freisbach, DE
• Rainer Schlichtmann · Ludwigshafen, DE
• Hubert Kindler
• Peter Klaerner · Battenberg, DE
• Hans Mittnacht · Weinheim, DE

Key dates

• Filing date: Dec 7, 1989
• Grant date: May 12, 1992
• Expiry date: Dec 7, 2009

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08L51/04
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

An impact-resistant thermoplastic molding material which contains, based in each case on A+B, from 80 to 50% by weight of a hard matrix A of polystyrene having a molecular weight M.eta. of from 150,000 to 200,000 and from 50 to 20% by weight of a soft phase B which is uniformly distributed in the hard matrix and has a median particle diameter d.sub.50 (volume average) of from 1 to 10 .mu.m, and can be obtained by polymerizing styrene in the presence of an elastomeric grafting base, advantageously has a molecular weight of the grafted branches of from 1.1 to 1.35 times the molecular weight of the hard matrix, and the degree of grafting is from 50 to 100%.