Patent ID: 6399726
Filing Date: 2002-06-04
Classification: C08F,Y10S

Abstract:
A method for the copolymerization of conjugated diolefins with vinyl-aromatic compounds, wherein the polymerization of the conjugated diolefins with the vinyl-aromatic compounds is performed in the presence of catalysts consisting ofa) at least one rare-earth metal compound and b) at least one organo-aluminum compound and in the presence of inert aliphatic and/or aromatic solvents or mixtures thereof at temperatures of âˆ’30 to +140Â° C., whereby the molar ratio of components (a):(b) is in the range of 1:(0.1 to 1000), component (a) of the catalyst is used in quantities of 1 &mgr;mol to 10 mmol relative to 100 g of the conjugated diolefins used, and the vinyl aromatic compound is used in quantities of 20 g to 2000 g, relative to 100 g of the conjugated diolefins used.