Process for the preparation of 1-olefin polymers

Claim 1

In a process for the preparation of a 1-olefin polymer by polymerizing a 1-olefin of the formula R--CH═CH 2 in which R is an alkyl group having 1 to 28 carbon atoms or copolymerizing these olefins together with ethylene at a temperature from -60° to 200° C., under a pressure of 0.5 to 60 bar, in solution, in suspension or in the gas phase and in the presence of a catalyst consisting essentially of a transition metal component containing metallocene and an aluminoxane of formulae IV or V as second component wherein the transition metal component has been preactivated in aluminoxane of the formula IV ##STR15## for the linear type and/or of the formula V ##STR16## for the cyclic type, R 17 in the formulae IV and V being a C 1 -C 6 -alkyl group and p being an integer from 2 to 50, the process comprising a) dissolving the metallocene in a solution of aluminoxane in an inert hydrocarbon to form a preactivation solution; b) allowing the preactivation solution to stand for 5 minutes to 100 hours at a temperature of -78° C. to 100° C.; and c) stirring the alminoxane together with the liquid phase in the polymerization before the metallocene is added to the polymerization system.