INCREASED POLYMER MELT FLOW RATIO VIA FEED OF A SUPPORTED CATALYST SATURATED WITH A SELECTED LIQUID AGENT

摘要

A process for the production of ethylene alpha- olefin copolymers is disclosed. The process may include feeding a catalyst system comprising a supported metallocene , such as a hafnocene, having pores saturated with a selected liquid agent, to a gas phase polymerization reactor. Ethylene and an alpha- olefin may then be contacted with the supported metallocene in the gas phase polymerization reactor to produce an ethylene alpha- olefin copolymer. The copolymer may have a density of less than 0.93 g/cm3' a melt index (3/4 of less than 2 dg/min, and a melt flow ratio (I21 / 12) of at least 28. To advantageously result in desired effects on catalyst properties and/or polymer properties, the liquid agent may be selected to advantageously manipulate catalyst temperature profiles and/or catalyst - monomer interaction during an initial heating period when the catalyst is first introduced to the reactor.