Hydrogenation catalyst composition and method for hydrogenation of conjugated diene polymer

A catalyst composition for hydrogenating a polymer having a conjugated diene, comprising:

• (a) a first composition having one of a titanium compound of a formula (I):
• wherein:
• R1 and R2 are ones selected from the group consisting of hydrogen, halogen, C1˜C8 alkyl, C1˜C8 alkoxy, C6˜C12 cycloalkyl, phenyl, phenoxy, C7˜C10 arylalkoxy, C7˜C10 arylalkyl, carboxy, —CH2P(phenyl)2, —CH2Si(C1˜C5 alkyl)3 and —P(phenyl)2;
• and
• Cp* is one selected from the group consisting of cyclopendienyl, fluorenyl, indenyl and derivatives thereof,
• (b) a second composition having one of a first compound of a formula (II) and a second compound of a formula (III):
• wherein R is one selected from the group consisting of C1˜C12 alkyl, C3˜C12 cycloalkyl, aryl, and alkyl aryl, M is one selected from the group consisting of C1˜C12 alkyl, C1˜C12 alkoxy, aryl, alkyl aryl, phenoxy and hydroxyl and n=1 to 3;
• and
• (c) a third composition having an alkylaluminum compound of a formula (IV):
• wherein the R4, R5 and R6 are ones selected from the group consisting of C1˜C12 alkyl, C6˜C12 aryl, hydrogen and halogen.