Patent ID: 6031056
Filing Date: 2000-02-29
Classification: C08F

Abstract:
A process for homopolymerizing ethylene or copolymerizing ethylene with one or more .alpha.-olefins having 3-12 carbon atoms and optionally one or more non-conjugated dienes under effective polymerization conditions at a temperature above 150.degree. C. in the presence of a catalyst system comprising a catalyst A and at least one cocatalyst B,said catalyst A being a product obtained from constituents (a), (b), (c) and (d):(a) at least one magnesium compound represented by the general formula R.sup.1 R.sup.2 Mg, in which R.sup.1 and R.sup.2 are alkyl- or alkoxy groups with 1-12 carbon atoms, provided that R.sup.1 and R.sup.2 may be the same or different,(b) an organic chloride that does not react spontaneously with said at least one magnesium compound,(c) a transition metal compound that consists of one selected from the group of compounds of Ti, Zr, Hf and a mixture thereof, and(d) at least one transfer agent consisting essentially of at least one selected from the group consisting of organoaluminum compounds, organoboron chlorides, organozinc compounds,wherein the transfer agent and magnesium compound are such that the molar ratio between the metal of the transfer agent and the magnesium of the magnesium compound is between 0.1 and 1; andsaid cocatalyst B comprising at least one organometallic compound with a metal from Group 1, 2, or 13 of the Periodic System of Elements.