Catalyst for the polymerization of olefins

摘要

The present invention relates to catalysts systems for the polymerization of olefins CH2═CHR, wherein R is an alkyl, cycloalkyl or aryl radical having 1-12 carbon atoms, comprising (A) a solid catalyst component comprising Ti, Mg, and halogen (B) an aluminum alkyl compound and (C) a brominated cyclic hydrocarbon. Said catalyst systems have improved polymerization activity.

主权项

1. A process for the (co)polymerization of ethylene comprising (co)polymerizing ethylene in the presence of a catalyst system comprising:
(A) a solid catalyst component comprising Ti, Mg and halogen; (B) an aluminum alkyl compound; and (C) a composition compound having the formula: wherein the compound (C) is used in amounts to give a (B)/(C) molar ratio ranging from 1 to 50, and said components (A)-(C) are fed separately into the polymerization reactor or are pre-contacted for a period of time ranging from 0.1 to 120 minutes at a temperature ranging from 0 to 90° C.