Process for the polymerization or copolymerization of ethylene

摘要

A process for polymerizing or copolymerizing ethylene, characterized in that ethylene or a mixture of ethylene with other alpha -olefin is polymerized in the presence of a catalyst comprising: [I] a solid catalyst component (B) obtained by reacting the following three components: (a) a reaction product (A) of an organomagnesium compound with a hydropolysiloxane or a silicon compound in which organic groups and hydroxyl groups are bonded to silicon atoms, (b) a silicon compound of the formula Rl1Si(OR2)mX4-(l+m), wherein R1 is a hydrogen atom or a hydrocarbon group having from 1 to 8 carbon atoms, R2 is a hydrocarbon group having from 1 to 12 carbon atoms, X is a halogen atom, l is 0, 1 or 2, and m is a number of from 0 to 4, and (c) a titanium compound of the formula Ti(OR3)nX4-n, wherein R3 is a hydrocarbon group having from 1 to 12 carbon atoms, X is a halogen atom, and n is a number of 0 to 4, provided that m and n are not simultaneously 0, and when m is 0, n is 4, and [II] an organoaluminum compound.