ETHYLENE POLYMERIZATION PROCESS

摘要

This invention pertains to a polymerization process for making ethylene polymers characterized as having reduced gels or reduced extraneous high molecular weight polymer fractions. The process comprises operating the polymerization at relatively high chain terminator agent to ethylene ratios in the post-reactor polymerization system, or providing higher purity ethylene feed, or avoiding cross-contamination between Ziegler-Natta or chromium catalyst systems and metallocene catalyst systems by using a critically clean procedure for catalyst vessels and transfer pipe. In preferred embodiments, some or all of the three process steps are utilized.