Patent ID: 8921499

Claim:
A method of preparing an ethylene-α-olefin-diene copolymer by using a transition metal catalyst composition including a transition metal compound represented by Chemical Formula 1 below: In Chemical Formula 1, M is a Group 4 transition metal in the Periodic Table of Elements; n is an integer of 1 or 2, each R 1 may be the same or different when n is 2; R 1 is hydrogen, (C1-C50)alkyl, halo(C1-C50)alkyl, (C3-C50)cycloalkyl, (C6-C30)aryl, (C6-C30)aryl(C1-C50)alkyl, ((C1-C50)alkyl(C6-C30)aryl)(C1-C50)alkyl, —NR a R b , —SiR c R d R e , or 5- through 7-membered N-heterocycloalkyl containing at least one nitrogen atom; R 2 and R 3 each are independently hydrogen, (C1-C50)alkyl, (C1-C50)alkoxy, halo(C1-C50)alkyl, (C3-C50)cycloalkyl, (C6-C30)aryl, (C6-C30)aryloxy, (C1-C50)alkyl(C6-C30)aryloxy, (C6-C30)aryl(C1-C50)alkyl, ((C1-C50)alkyl(C6-C30)aryl)(C1-C50)alkyl, —NR a R b or —Si c R d R e ; R 4 , R 5 , R 10 , R 11 and R 12 each are independently (C1-C50)alkyl, halo(C1-C50)alkyl, (C3-C50)cycloalkyl, (C6-C30)aryl, (C6-C30)aryl(C1-C50)alkyl, ((C1-C50)alkyl(C6-C30)aryl)(C1-C50)alkyl, —NR a R b , or —SiR c R d R e , and R 11 and R 12 are optionally linked via (C4-C7)alkylene to form a ring; R 6 , R 7 , R 8 and R 9 each are independently hydrogen, (C1-C50)alkyl, halo(C1-C50)alkyl, (C3-C50)cycloalkyl, (C1-C50)alkoxy, (C6-C30)aryl, (C6-C30)aryl(C1-C50)alkyl, ((C1-C50)alkyl(C6-C30)aryl)(C1-C50)alkyl, (C6-C30)aryloxy, (C1-C50)alkyl(C6-C30)aryloxy, N-carbazolyl, —NR a R b , or —SiR c R d R e , or are optionally linked to an adjacent substituent via (C1-C5)alkylene to form a ring, and at least one —CH 2 — of the alkylene is optionally substituted by a hetero atom selected from —O—, —S—, and —NR′—, and the alkylene is optionally further substituted with (C1-C50)alkyl; aryl of R 1 to R 12 is optionally further substituted with at least one substituent selected from the group consisting of (C1-C50)alkyl, halo(C1-C50)alkyl, (C1-C50)alkoxy, (C6-C30)aryloxy, (C6-C30)aryl, (C1-C50)alkyl(C6-C30)aryl, and (C6-C30)aryl(C1-C50)alkyl; R′ and R a to R e each are independently (C1-C50)alkyl or (C6-C30)aryl; and X 1 and X 2 each are independently halogen, (C1-C50)alkyl, (C2-C50)alkenyl, (C3-C50)cycloalkyl, (C6-C30)aryl, (C6-C30)aryl(C1-C50)alkyl, ((C1-C50)alkyl(C6-C30)aryl)(C1-C50)alkyl, (C1-C50)alkoxy, (C6-C30)aryloxy, (C1-C50)alkyl(C6-C30)aryloxy, (C1-C50)alkoxy(C6-C30)aryloxy, (C1-C50)alkylidene, or an anion or dianion ligand consisting of 60 or less atoms containing N, P, O, S, Si, and halogen, except hydrogen, provided that one of X 1 and X 2 is a dianion ligand, the other is ignored.