Patent ID: 8232359

Claim:
A process for preparing ethylene homopolymers or copolymers of ethylene with α-olefin by using the transition metal compound, wherein the transition metal compound is represented by Chemical Formula (1): in the formula, M represents transition metal from Group 4 in the Periodic Table of Elements; Cp represents cyclopentadienyl ring which is η 5 -linkable to M, or a fused ring containing a cyclopentadienyl ring, in which the cyclopentadienyl ring or the fused ring containing a cyclopentadienyl ring may be further substituted by (C1-C20)alkyl, (C6-C30)aryl, (C2-C20)alkenyl or (C6-C30)ar(C1-C20)alkyl; Ar represents (C6-C14)arylene; R 11 and R 12 independently represent hydrogen atom, (C1-C10)alkyl or (C6-C13)aryl(C1-C10)alkyl; n is an integer from 0 to 3; R represents (C1-C10)alkyl, (C3-C 10)cycloalkyl, (C6-C13)aryl, (C1-C10)alkyl(C6-C13)aryl, (C6-C13)ar(C1-C10)alkyl or (C1-C10)alkoxy; when n is 2 or 3, individual substituents of R may be same or different; X 1 and X 2 independently represent halogen atom, (C1-C20)alkyl, (C3-C20)cycloalkyl, (C6-C30)aryl, (C6-C30)ar(C1-C20)alkyl, (C1-C20)alkoxy, (C6-C30)aryloxy, (C3-C20)alkylsiloxy, (C6-C30)arylsiloxy, (C1-C20)alkylamino, (C6-C30)arylamino, (C1-C20)alkylthio, (C6-C30)arylthio, (C1-C20)alkylphosphine, (C6-C30)arylphosphine, (C1-C20)alkylmercapto or (C6-C30)arylmercapto; the alkyl, cycloalkyl, aryl, arylalkyl, alkoxy, aryloxy, alkylsiloxy, arylsiloxy, alkylamino, arylamino, alkylthio, arylthio, alkylphosphine, arylphosphine, alkylmercapto, arylmercapto of R n , X 1 and X 2 ; and the arylene of Ar may be independently substituted by one or more substituent(s) selected from a group consisting of halogen, (C1-C20)alkyl, (C3-C20)cycloalkyl, (C6-C30)aryl, (C6-C30)ar(C1-C20)alkyl, (C1-C20)alkoxy, (C6-C30)aryloxy, (C3-C20)alkylsiloxy, (C6-C30)arylsiloxy, (C1-C20)alkylamino, (C6-C30)arylamino, (C1-C20)alkylthio, (C6-C30)arylthio, (C1-C20)alkylphosphine, (C6-C30)arylphosphine, (C1-C20)alkylmercapto and (C6-C30)arylmercapto; or each of them may be linked to an adjacent substituent via (C3-C12)alkylene or (C3-C12)alkenylene with or without a fused ring to form an alicyclic ring, or a monocyclic or polycyclic aromatic ring.