Thermoplastic block copolymers based on cyclic carbonates or esters

US5071921A · kind A · utility

Assignee

• BAYER HEALTHCARE LLC · DE

Inventors

• Herbert Eichenauer · Dormagen, DE
• Christian Lindner · Bensheim, DE
• Edgar Leitz · Dormagen, DE
• Karl-Heinz Ott
• Hans-Josef Buysch · Krefeld, DE
• Peter Mues · Duisburg, DE
• Hartwig Hocker · Eckersdorf, DE
• Helmut Keul · Aachen, DE

Key dates

• Filing date: Oct 20, 1989
• Grant date: Dec 10, 1991
• Expiry date: Oct 20, 2009

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08G64/18
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

Thermoplastic block copolymers of the idealized formulae (I) EQU A--B--A; B--A--B or (A--B).sub.x (I) in which EQU x=1 to 40, and wherein PA1 A is the radical of a homopolymer of styrene, vinylnaphthalene, butadiene and isoprene, and PA1 B the radical of a homopolymer of a cyclic polycarbonate or lactone, the average molecular weight of blocks A and B being greater than 800, and a process for the preparation of these blocks copolymers in several reaction stages.