Polymerization of ethylene and ethylene/1-hexene over Ziegler-Natta/metallocene hybrid catalysts supported on SiO2 prepared by a sol-gel method

摘要

A silica support for use in olefin polymerization was prepared by the gelation of a stable, colloidal phase of silica sol using a MgCl2 solution as the initiator. The Ziegler-Natta/Metallocene hybrid catalysts prepared using this support exhibited characteristics of both Ziegler-Natta and metallocene catalysts. The polymers produced by the hybrid catalysts showed a bimodal molecular weight distribution pattern and two different melting points, corresponding to products arising from each catalyst. This suggests that the hybrid catalysts acted as individual active species and produced a blend of polymers. (C) 2000 John Wiley & Sons, Inc. [References: 13]