Patent ID: 6303721
Filing Date: 2001-10-16
Classification: C08F

Abstract:
A process for the anionic polymerization of dienes or copolymerization of dienes and vinylaromatic monomers in a vinylaromatic monomer or monomer mixture as solvent to give homopolydienes or copolymers or mixed homopolydienes and copolymers, wherein the polymerization is carried out in the presence of an initiator composition consisting of an alkali metal alkyl or aryl as initiator and a metal alkyl or aryl of an element having a valence of at least two selected from the group consisting of magnesium, aluminum, boron and zinc and without addition of Lewis bases and using less than 40% by volume of a further solvent, based on the vinylaromatic monomer or monomer mixture.