Patent ID: 7776974
Filing Date: 2010-08-17
Classification: C08F,Y02P,Y10S

Abstract:
1. A slurry process for making polyethylene useful in pipe or molding applications and having low long-chain branching and broad molecular weight distribution, said process comprising: (a) in a first reactor, polymerizing ethylene in the presence of hydrogen and a catalyst comprising an activator and a supported, dimethylsilyl-bridged indeno[1,2-b]indolyl zirconium complex to produce a slurry comprising an ethylene homopolymer having a weight-average molecular weight within the range of 15,000 and 150,000; (b) removing at least some of the unreacted hydrogen from the slurry; and (c) in a second reactor, reacting the slurry from step (b) with ethylene and a C wherein each R 1 is independently a C 1 -C 10 hydrocarbyl; each R 2 is independently selected from the group consisting of H, F, and C l -C 10 hydrocarbyl; R 3 is a C 4 -C 10 hydrocarbyl; and each L is independently selected from the group consisting of halide, alkoxy, aryloxy, siloxy, alkylamino, and C 1 -C 30 hydrocarbyl.