Patent ID: 6713572
Filing Date: 2004-03-30
Classification: C08F,Y10S

Abstract:
A process for preparing an ethylene copolymer having a density of 0.93 g/mL or less in a particle form polymerization process using a titanium-containing catalyst, the process comprising contacting ethylene and at least one higher alpha-olefin in a liquid diluent consisting essentially of isobutane with the titanium-containing catalyst and a cocatalyst in a continuous loop reactor under particle form polymerization conditions wherein, the molar ratio of the comonomer to ethylene is at least about 1:1, wherein the polymerization is conducted at a temperature in the range of 80Â° C. to about 90Â° C. and wherein the titanium-containing catalyst is prepared by contacting a titanium alkoxide and magnesium dihalide in a liquid to obtain a solution, contacting the solution with a precipitating agent selected from organoaluminum compounds to obtain a solid, contacting the solid with titanium tetrachloride before or after a prepolymerization step to result in a prepolymerized catalyst precursor, contacting the resulting prepolymerized catalyst precursor with an organometallic reducing agent to produce a resulting solid, washing the resulting solid with a hydrocarbon to remove soluble material to result in a washed solid which is the titanium-containing catalyst.