Process for polymerizing ethylene

摘要

A process for polymerizing or copolymerizing ethylene comprises contacting ethylene or ethylene and at least one of alpha -olefins with a catalyst consisting essentially of a combination of (A) a solid catalyst component containing at least titanium, magnesium and chlorine, (B) an organoaluminum compound, and (C) an organic compound selected from the group consisting of a compound having P-O-C bond, a compound having B-O-C bond and a compound having C-O-R bond, at a temperature not lower than 125 DEG C. and under a pressure not lower than 200 kg/cm2.