CATALYST SYSTEM FOR USE IN ETHYLENE POLYMERIZATION AND COPOLYMERIZATION AND PROCESS FOR PREPARING THE SAME

摘要

The present invention provides a catalyst system for use in ethylene polymerization and copolymerization and processes for preparing the same, wherein the catalyst system is obtained by dissolving an electron-donor activator and optionally, a metal halide adjusting agent, into a solution of magnesium halide in a solvent system consisting essentially of organic epoxy compounds and organic phosphorus compounds to form a homogeneous solution and then mixing with at least one coprecipitators and a transition metal titanium halide or its derivative to form a solid component, followed by incorporating in combination with an organic aluminum component prior to use in polymerizations. When used in ethylene polymerization, the catalyst system exhibits very high polymerization activity, and the resultant polymer particles exhibit better particle morphology and higher apperant density.