Patent ID: 7354981
Filing Date: 2008-04-08
Classification: B01J,C08F

Abstract:
1. A polyethylene catalyst consisting of a main component of catalyst and a cocatalyst, wherein the main component of catalyst is prepared by a preparation process comprising reacting the following components: (1) a magnesium-alcohol complex prepared by reacting a magnesium compound in nascent state having a formula (MgRX) (2) an alkyl aluminum compound having a formula R (3) a titanium compound having a formula Ti(OR the cocatalyst is an organic aluminum compound, and molar ratio of Al in the cocatalyst to Ti in the main component is in a range of from 30:1 to 300:1, wherein the preparation process produces a catalyst that, in a slurry polymerization process, catalyzes the polymerization of ethylene to polyethylene such that, under polymerization conditions of a temperature of 85° C., a total pressure of 1.0MPa, a ratio of Al/Ti of 200, a polymerization time of 2 hours, hexane as diluent, and addition of hydrogen gas, the catalyst exhibits a polymerization activity that drops by no more than 61% when a ratio of hydrogen/ethylene in the polymerization process increases from 0.2/0.8 to 0.7/0.3.