AB block copolymers based on butadiene, isoprene and styrene

US5053459A · kind A · utility

Assignee

• Huls Aktiengesellschaft · DE

Inventors

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

Key dates

• Filing date: May 31, 1989
• Grant date: Oct 1, 1991
• Expiry date: May 31, 2009

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10S152/905
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

An unsaturated elastomeric AB block copolymer comprising 20-75 wt. % 1,3-butadiene monomer units; 5-50 wt. % isoprene monomer units; and 3-30% wt. % styrene monomer units; wherein said block copolymer contains less than 3 wt. % styrene blocks, each of said block A and block B contain all three of said monomer units, said copolymer comprises 30-90 wt. % of block A and 70-10 wt. % of block B, and wherein the average vinyl and isopropenyl content of block B are each at least 30% higher than those of block A; and a method for preparing the unsaturated AB block copolymer.