Method for the production of a copolymer based on vinyl aromatic compounds and conjugated dienes

US6417285B2 · kind B2 · utility

Assignee

• BAYER HEALTHCARE LLC · DE

Inventors

• Ellen Giebeler · Recklinghausen, DE
• Heinz-Dieter Brandt · Willich, DE
• Rudiger Engehausen · Dormagen, DE
• Gunter Marwede · Cologne, DE

Key dates

• Filing date: Jan 18, 2001
• Grant date: Jul 9, 2002
• Expiry date: Jan 18, 2021

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08C19/20
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

The present invention provides a method for the production of a copolymer based on vinyl aromatic compounds and conjugated dienes, in which after polymerization, the copolymers are treated with multi-functional sulfur halides in the presence of a catalyst at temperatures in the range from 20 to 130° C.The copolymers produced according to the present invention demonstrate clearly improved processing characteristics as a result of selective masticating effect and good mechanical properties.