Catalyst composition for hydrogenation and their use for hydrogenation conjugated diene polymer

A process for hydrogenation of a conjugated diene polymer comprising hydrogenating said polymer in the presence of hydrogen and:

• (I) a hydrogenation catalyst composition, wherein the catalyst composition comprising:
• (1) a titanium compound (A) represented by the following formula (a):
• wherein R1 and R2, which may be the same or different, represent a halogen atom, an alkyl group, an aryl group, an arakyl group, a cycloalkyl group, an aryloxy group, an alkoxy group or a carbonyl group, and Cp* represents a cyclopentadienyl group or a derivative having the formula of C5R35, and R3, which may be the same or different, represents a hydrogen atom;
• (2) a silyl hydride (B) selected from the group having a Si—H group and consisting of:
• (i) a monomeric silyl hydride represented by the following formula (b):
• wherein X1, X2 and X3 which may be the same or different, represent a hydrogen atom, a halogen atom, an alkyl group, an aryl group, an aralkyl group, a cycloalkyl group, an aryloxy group, an alkoxy group, an acyloxy group or a carboxylate group,
• (ii) a polymeric silyl hydride represented by the following formula (c):
• wherein each R5 can be the same or different and is selected from the group consisting of a hydrogen atom, a halogen atom, an alkyl group, an aryl group, an aralkyl group, a cycloalkyl group, an aryloxy group and an alkoxy group and m>0;
• (iii) a cyclic silyl hydride represented by the following formula (d):
• wherein R6 represent a hydrogen atom, a halogen atom, an alkyl group, an aryl group, an aralkyl group, a cycloalkyl group, an aryloxy group or an alkoxy group and n=2, 3, 4 or 5;
• and
• (3) a compound (C) represented by the following formula (e):
• wherein R4 is an alkyl group of C1˜C12 or a cycloalkyl group of C1˜C12, X4 can be the same or different and is an alkyl group of C1˜C12, an alkoxy group of C1˜C12, cycloalkoxy group of C1˜C12, a halogen atom or a carbonyl group, and conducting the hydrogenation in
• (II) a middle to large sized reactor having a capacity of 25 liters or larger, with
• (III) a temperature of 50° C.˜150° C., and
• (IV) a hydrogen pressure of 1 kg/cm2˜20 kg/cm2.