Patent ID: 8067511
Filing Date: 2011-11-29
Classification: B01J,C08F,C08L,Y10S

Abstract:
1. A process for preparing ethylene copolymer, which comprises (a) polymerizing ethylene and one or more C3-C18 α-olefin comonomer(s) in the presence of a catalyst composition containing a transition metal catalyst represented by Chemical Formula (1) in one or more adiabatic solution-phase reactor(s) equipped with feed cooler and feed heater to produce a first copolymer; and (b) passing the first copolymer prepared from stage (a) through at least one other adiabatic solution-phase reactor(s) equipped with feed cooler and feed heater and containing ethylene or ethylene and at least one C3-C18 α-olefin at a temperature higher than the reaction temperature of stage (a) in the presence of the same catalyst composition employed in stage (a) in order to prepare polymer of high temperature which contains ethylene and C3-C18 α-olefin copolymer composition, in the formula, M represents transition metal from Group 4 in the Periodic Table of Elements; Cp represents a cyclopentadienyl ring which is η R Ar X wherein n is an integer of 1 or 2; R the alkyl, aryl, cycloalkyl, aralkyl, alkoxy, alkylsiloxy, arylsiloxy, alkylamino, arylamino, alkylthio or arylthio of R