Patent ID: 6201077
Filing Date: 2001-03-13
Classification: C08F

Abstract:
A process comprising polymerizing ethylene, or polymerizing ethylene and at least one other olefin, to produce a polymer,wherein said polymerizing is conducted in a polymerization zone, andwherein said polymerizing is conducted using a catalyst and a cocatalyst, andwherein said catalyst comprises chromium on a support, andwherein the amount of said chromium on said support is from about 0.5 to 5 weight percent, based on the weight of the support andwherein said support comprises silica in major part and titaniawherein the amount of titanium is greater than about 3.5 to about 10 weight percent based on the weight of said support, andwherein said support has a surface area from about 400 to about 800 square meters per gram, andwherein said support has a pore volume from about 1.8 to about 4 cubic centimeters per gram, andwherein said catalyst has been activated at a temperature in the range of about 600.degree. F. to about 1100.degree. F. in the presence of an oxidizing ambient, andwherein said cocatalyst is an organoboron compound; andrecovering of a polymer having a shear ratio (HLMI/MI) greater than 200 and a heterogeneity index (M.sub.w /M.sub.n) greater than 30.