Patent ID: 7700694

Claim:
A catalyst composition for hydrogenating a polymer having a conjugated diene, wherein said polymer is one of a conjugated diene homopolymer and a copolymer of a vinyl aromatic hydrocarbon, comprising: (a) a first composition having one of a titanium compound of a formula (I) and a mixture thereof: wherein: R 1 and R 2 are identical or different and are ones selected from the group consisting of hydrogen, halogen, C 1 ˜C 8 alkyl, C 1 ˜C 8 alkoxy, C 6 ˜C 12 cycloalkyl, phenyl, phenoxy, C 7 ˜C 10 arylalkoxy, C 7 ˜C 10 arylalkyl, carboxy, —CH 2 P(phenyl) 2 , —CH 2 Si(C 1 ˜C 5 alkyl) 3 and —P(phenyl) 2 ; and A is one selected from the group consisting of cyclopendienyl, fluorenyl, indenyl and derivatives thereof; (b) a second composition having one selected from the group consisting of a first compound of a formula (II), a second compound of a formula (III) and a mixture thereof: wherein said formula (II) has a chain structure, said formula (III) has a cyclic structure, said R is C 1 ˜C 12 alkyl, said X 1 and X 2 are ones selected from the group consisting of C 1 ˜C 12 alkyl, C 1 ˜C 12 cycloalkoxy, aryl, C 1 ˜C 12 alkyl aryl and carbonyl, and n>1 and m>2; and (c) a third composition having an organic metallic compound.