Patent ID: 8618228
Filing Date: 2013-12-31
Classification: C08F,Y02P

Abstract:
1. A process for the preparation of an ethylene copolymer composition having a polydispersity index M w /M n of from 3 to 100, comprising: a) feeding ethylene to at least one polymerization reactor; b) performing in the at least one polymerization reactor an oligomerization of ethylene in the presence of an oligomerization catalyst component (C) to produce a comonomer; c) performing simultaneously in the at least one polymerization reactor polymerization reactions in the presence of catalyst components (A) and (B) producing, respectively, a first and a second polyethylene fraction, wherein the weight average molecular weight M d) withdrawing the ethylene copolymer composition from the polymerization reactor, wherein catalyst component (A) is an iron or cobalt complex of general formula (I): wherein L E R R R u independently of one another are 0 for E R v independently of one another, are 0 or 1, and when v is 0 the bond between L R R or R the radicals R M X R R s is 1, 2, 3 or 4, D t is 0 to 4, and at least one radical of the group consisting of R catalyst component (C) is an iron or cobalt complex of general formula (V): wherein L E R R R u independently of one another are 0 for E R v independently of one another, are 0 or 1, and when v is 0 the bond between L R R or R the radicals R M X R R s is 1, 2, 3 or 4, D t is 0 to 4, wherein at least one olefin is fed to the at least one polymerization reactor as an additional comonomer beside ethylene and from 5% by weight to 90% by weight of the structural units of the ethylene copolymer composition, which results from the incorporated comonomer, result from olefin, which was fed to the at least one polymerization reactor, and from 10% by weight to 95% by weight of the structural units of the ethylene copolymer composition, which results from the incorporated comonomer, result from comonomer, which was obtained by oligomerization of ethylene according to step b).