Unsaturated, elastomeric, asymmetrically, coupled block copolymers, a dual batch process for its manufacture and their use for the production of type components

US5061758A · kind A · utility

Assignee

• Huels Aktiengesellschaft · DE

Inventors

• Walter Hellermann · Dorsten, DE
• Christoph Herrmann · Aachen, DE
• Karl-Heinz Nordsiek
• Jurgen Wolpers · Bochum, DE
• Hans-Bernd Fuchs · Marl, DE

Key dates

• Filing date: Oct 5, 1989
• Grant date: Oct 29, 1991
• Expiry date: Oct 5, 2009

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08F297/046
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

An unsaturated elastomeric, asymmetrically coupled block copolymer of the formula: (A).sub.n -X-(B).sub.m, wherein block A is a block of polybutadiene having a content of uniformly distributed vinyl groups ranging from 8 to 60% and block (B) is a homopolymer of isoprene or a copolymer of at least 10% isoprene with 0 to 60% butadiene and up to 45% styrene, the copolymer having a vinyl unit content of 75 to 90%, X is a radical of a coupling agent and (m-n).gtoreq.0 and (m+n) ranges from 3 to 25.