Process for the preparation of polymers of alpha -olefins at high temperatures

摘要

A solution process for the preparation of high molecular weight homopolymers of ethylene and copolymers of ethylene and C3-C12 alpha -olefins is disclosed. The process involves feeding monomer, a particular coordination catalyst and hydrocarbon solvent to a reactor, polymerizing the monomer at a temperature of 105 DEG -320 DEG C. and recovering the polymer. The catalyst is obtained by combining solutions of titanium tetrahalide and of organoaluminum compound at a temperature of less than 30 DEG C., heating the resulting admixture to a temperature of 150 DEG -300 DEG C. for a period of 10 seconds to 10 minutes and combining the thus heat-treated mixture with a solution of an organoaluminum compound. The catalyst thus obtained is fed to the process, without separation of any components of the catalyst. In an embodiment part of the titanium tetrahalide may be replaced with vanadium oxytrihalide.