Patent ID: 8492494
Filing Date: 2013-07-23
Classification: C08F

Abstract:
1. A process for preparing copolymer of ethylene with (C3-C18) α-olefin comonomer, having a density of 0.900 to 0.940 g/cm 3 , and falling dart impact strength (F) satisfying the correlation with Vicat softening point as expressed by Formulas (1) and (2): wherein, V represents Vicat softening point measured according to ASTM D 1525; and F represents falling dart impact strength, according to ASTM D1709 which comprises (a) polymerizing ethylene and (C3-C18) α-olefin comonomer in the presence of a catalyst composition containing a transition metal catalyst represented by Chemical Formula (1) in one or more reactor(s) to produce a first copolymer; and (b) passing the first copolymer prepared from stage (a) through at least one other reactor(s) containing ethylene or ethylene and (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 R the alkyl, aryl, cycloalkyl, aralkyl, alkoxy, alkylsiloxy, arylsiloxy, alkylamino, arylamino, alkylthio or arylthio of R