Patent ID: 7985817
Filing Date: 2011-07-26
Classification: C08F

Abstract:
1. A homogenous catalyst system, comprising: a homogenous catalyst which has stability under high temperature solution polymerization at 120-250° C. for producing an ethylene polymer represented by Formula 1 below, in which: a cyclopentadiene derivative and an electron donating substituent, both of which are bonded to a Group IV transition metal, are crosslinked through a silyl derivative substituted with a cyclic hydrocarbon, and tris(pentafluoro)borane cocatalyst, an aluminoxane cocatalyst and tris(pentafluoro)borane cocatalyst, or an organic alkyl aluminum and tris(pentafluoro)borane cocatalyst: wherein M is a Group IV transition metal in the periodic table; Cp is cyclopentadienyl or a derivative thereof, which is η D is an electron donating substituent including any one element selected from the group consisting of nitrogen, phosphorus, oxygen, and sulfur, with a C1-C20 alkyl group; X is a halogen atom, a C1-C20 alkyl group with the exception of Cp derivatives, a C7-C30 arylalkyl group, a C1-C20 alkyl-containing alkoxy group, a C3-C20 alkyl-substituted siloxy group, or a C1-C20 hydrocarbon-containing amido group; m is 3; and n is 1 or 2 depending on an oxidation value of the transition metal, wherein aluminoxane or organic alkyl aluminum is mixed such that a molar ratio of central transition metal:boron atom:aluminum atom is 1:0.5-5:25-500.