VERFAHREN ZUR HERSTELLUNG VON AETHYLENPOLYMEREN.

摘要

A method of preparing ethylene polymers which comprises polymerizing ethylene, or ethylene and one or more alpha -olefins other than ethylene in the presence of a composite catalyst which catalyst comprises: (A) a solid composition prepared by depositing one or more chromium compounds and one or more metal compounds other than said chromium compounds onto an inorganic oxide support material and then calcining the resulting solid; and (B) one or more organometallic compounds that are each independently represented by the following general formula: MR<1>aR<2>bR<3>c wherein M is a metal of Group I, II or III of the periodic table and the R<1>, R<2> and R<3> moieties are each independently hydrogen, a hydrocarbon radical of C1-C14, or an alkoxy group of C1-C14, excluding the case that all moieties are hydrogen; and, a, b and c are each independently a real number of not less than zero with the proviso that the sum of numbers a, b and c is equal to the formal valence of metal M. t