Patent ID: 7714091
Filing Date: 2010-05-11
Classification: C08F

Abstract:
1. A process for preparing an ethylene polymer comprising polymerizing ethylene or ethylene with C 3 -C 20 -olefins as comonomers in the presence of a polymerization catalyst, the catalyst being obtained by a process comprising: supporting compounds selected from the group consisting of chromium compound(s) and zirconium compound(s), and optionally a fluorinating agent, with an organic polar solvent onto a finely divided inorganic support having a pore volume, thereby forming a treated support; and calcining the treated support at a temperature of from 350 to 1050° C. under oxidative conditions, the catalyst having a chromium content of from 0.1 to 5% by weight, a zirconium content of from 0.5 to 10% by weight, in each case based on the element in the finished catalyst, and a molar ratio of zirconium to chromium from 0.6 to 5.