Solution polymerization of conjugated dienes

US4260707A · kind A · utility

Assignee

• BAYER HEALTHCARE LLC · DE

Inventors

• Gerd Sylvester · Leverkusen, DE
• Josef Witte · Cologne, DE
• Gunter Marwede · Cologne, DE

Key dates

• Filing date: Feb 1, 1980
• Grant date: Apr 7, 1981
• Expiry date: Feb 1, 2000

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08F36/04
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

A catalyst comprising PA1 (a) a reaction mixture formed by reacting M(RCO.sub.2).sub.3 with AlR.sub.3.sup.1, PA1 (b) AlR.sub.3.sup.2 and/or HAlR.sub.2.sup.2 and PA1 (c) a Lewis acid wherein M denotes a trivalent rare earth element with an atomic number of 57 to 71, R denotes a saturated or unsaturated, straight chain or branched chain alkyl group having 1 to 20 C-atoms which may be substituted one or more times with cycloalkyl having 5 to 7-atoms and/or phenyl, the carboxyl group being attached to a primary, secondary or tertiary C-atom; a cycloalkyl group having 5 to 7 ring carbon atoms, which may be substituted one or more times with alkyl groups having from 1 to 5 C-atoms; or an aromatic group having from 6 to 10 ring carbon atoms, which may be substituted one or more times with alkyl groups having 1 to 5 C-atoms, and R.sup.1 and R.sup.2 are identical or different, straight chain or branched chain alkyl groups having from 1 to 10 C-atoms. Said catalyst may be used for polymerizing diene monomers in solution. Its production takes place by mixing the components in any order.