Patent ID: 8344081

Claim:
A transition metal catalyst composition for the preparation of an ethylene homopolymer or a copolymer of ethylene and an α-olefin comprising: a transition metal complex represented by the following Chemical Formula 1; and an alkylaluminoxane or organoaluminum cocatalyst, a boron compound cocatalyst or a mixture thereof: wherein M is a group IV transition metal; Cp is capable of forming a η 5 -bonding with M, and is a cyclopentadienyl ring unsubstituted or substituted by C 1 -C 20 alkyl, C 6 -C 30 aryl, C 2 -C 20 alkenyl or C 6 -C 30 aryl C 1 -C 20 alkyl, or a fused ring unsubstituted or substituted by C 1 -C 20 alkyl, C 6 -C 30 aryl, C 2 -C 20 alkenyl or C 6 -C 30 aryl C 1 -C 20 alkyl having a cyclopentadienyl ring; R 1 is C 1 -C 20 alkyl or C 6 -C 30 aryl or C 1 -C 10 alkyl; R 2 is hydrogen, halogen, linear or branched C 1 -C 20 alkyl optionally substituted by one or more halogen, linear or branched C 1 -C 20 alkyl-substituted silyl optionally substituted by one or more halogen, C 6 -C 30 aryl optionally substituted by one or more halogen, C 6 -C 30 aryl C 1 -C 10 alkyl optionally substituted by one or more halogen, C 1 -C 20 alkoxy optionally substituted by one or more halogen, C 3 -C 20 alkyl-substituted or C 6 -C 20 aryl substituted siloxy, C 1 -C 20 alkyl-substituted or C 6 -C 30 aryl-substituted amino, C 1 -C 20 alkyl-substituted or C 6 -C 30 aryl-substituted phosphine, C 1 -C 20 alkyl-substituted mercapto, or nitro; n is an integer 1 or 2; and X is independently halogen, C 1 -C 20 alkyl, C 3 -C 20 cycloalkyl, C 6 -C 30 aryl C 1 -C 20 alkyl, C 1 -C 20 alkoxy, C 3 -C 20 alkylsiloxy, C 1 -C 20 alkyl-substituted or C 6 -C 30 aryl-substituted amino, C 1 -C 20 alkyl-substituted or C 6 -C 30 aryl-substituted phosphine, or C 1 -C 20 alkyl-substituted mercapto.