Thermoplastic moldings materials of improved green strength and low-temperature toughness based on a thermoplastics polyurethane copolymer mixture, preparation thereof and use thereof

US5260375A · kind A · utility

Assignee

• BASF SE

Inventors

• Dietrich Lausberg · Ludwigshafen, DE
• Klaus Muehlbach · Havelsee, DE
• Uwe Blumenstein · Ludwigshafen, DE
• Knud Faehndrich · Diepholz, DE

Key dates

• Filing date: Feb 25, 1991
• Grant date: Nov 9, 1993
• Expiry date: Feb 25, 2011

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08L75/04
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

Thermoplastic molding materials of improved green strength and impact toughness at low temperatures which are useful for producing injection moldings and are based on a TPU copolymer mixture, contain, based on 100 parts by weight, PA0 A) from 20 to 90 parts by weight of at least one thermoplastic polyurethane, PA0 B) from 1 to 40 parts by weight of at least one elastomeric graft copolymer formed from PA1 B1) a grafting base comprising an elastomeric polymer having a glass transition temperature of below -20.degree. C. based on butadiene or an acrylate of from 1 to 10 carbon atoms in the alcohol moiety with or without a crosslinker and PA1 B2) a graft superstratum prepared by single- or multi-stage copolymerization of styrene, .alpha.-methylstyrene, acrylonitrile,methacrylonitrile and methyl methacrylate or of a mixture of at least two of said monomers, PA0 C) from 5 to 75 parts by weight of at least one copolymer prepared by copolymerization of, based on the total weight of (C), PA1 C1) from 55 to 90% by weight of .alpha.-methylstyrene and PA1 C2) from 10 to 45% by weight of acrylonitrile or methacrylonitrile or a mixture thereof, PA0 D) from 0.1 to 5 parts by weight of at least on…