Catalyst based on rare earth metals

摘要

A catalyst, based on a rare earth metal compound and an organoaluminum compound, also contains trihalosilane or vinyl-trihalosilane. A rare earth metal-based catalyst contains: (a) a rare earth metal compound, (b) an organoaluminium compound and (c) a trihalosilane of formula R-S(Hal)3. Hal = fluorine, chlorine or bromine; and R = H or vinyl. The weight ratio of (a):(b):(c) is 1:(0.5-5):(0.05-0.5). An Independent claim is also included for a method for the production of this catalyst by mixing (a), (b) and (c) in the above ratios at -30 to 100 degrees C.