Process for the preparation of polymers based on conjugated dienes and optionally monovinylaromatic compounds

US5008343A · kind A · utility

Assignee

• Huels Aktiengesellschaft · DE

Inventors

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

Key dates

• Filing date: Feb 20, 1990
• Grant date: Apr 16, 1991
• Expiry date: Feb 20, 2010

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10T428/31909
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

A block-free polymer is prepared by anionically polymerizing at least two compounds selected from the groups consisting of butadiene, isoprene and styrene in an inert organic solvent in the presence of an organolithium compound as a catalyst and a cocatalyst of a glycol dialkyl ether: ##STR1## wherein R.sub.3 is hydrogen, methyl or ethyl, R.sub.1 and R.sub.2 are alkyl groups of different numbers of carbon atoms selected from the group consisting of methyl, ethyl, n-propyl, isopropyl, n-butyl, iso-butyl, sec-butyl and t-butyl, and the total number of carbon atoms in the alkyl group ranges from 5 to 7.