Method for retarded anionic polymerization

US6350834B1 · kind B1 · utility

Assignee

• BASF SE

Inventors

• Christian Schade · Ludwigshafen, DE
• Wolfgang Fischer · Meerbusch, DE
• Hermann Gausepohl · Mutterstadt, DE
• Konrad Knoll · Mannheim, DE
• Volker Warzelhan · Bad Dürkheim, DE
• Michel Fontanille · Montmorency, FR
• Alain Deffieux · Talence, FR
• Philippe Desbois · Maikammer, DE

Key dates

• Filing date: Aug 14, 2000
• Grant date: Feb 26, 2002
• Expiry date: Aug 14, 2020

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08F236/10
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

In a process for the homopolymerization of vinylaromatic monomers or the copolymerization of vinylaromatic monomers and dienes in the presence of at least one alkali metal compound and at least one compound of an element of group 3a of the Periodic Table of the elements, the compounds contain, based on the sum of molar equivalents of alkali metal and elements of group 3a, in each casea) from 0.1 to 3.9 molar equivalents of oxygen, sulfur, nitrogen or phosphorus andb) from 0.1 to 3.9 molar equivalents of an organyl ligand.