The use of lewis acids for the breakdown of gelatinous rare earth compounds in hydrocarbon solutions

摘要

The present invention is directed to a process for the preparation of a non-viscous hydrocarbon solution containing a lanthanum(Ln) rare earth series compound by dissolving or synthesizing a lanthanum compound in an inert hydrocarbon solvent with a Lewis acid in an amount sufficient to prevent formation of highly viscous solutions. The present invention is also directed to the use of the non-viscous Ln solutions formed by the recited process as co-catalysts for the polymerization of dienes.