Patent ID: 7915349

Claim:
A process for producing a conjugated diene polymer composition, which comprises of polymerizing a conjugated diene compound or a conjugated diene compound and an aromatic vinyl compound in a hydrocarbon solvent in the presence of at least one compound selected from the group consisting of organoalkali metals and organoalkaline earth metals as an initiator and then reacting the active end of the resulting polymer with a low molecular compound represented by the following formula (1) or the following formula (2): (wherein in the formula (1), R 1 represents an organic group containing an N atom not adjacent to the N atom of the aminosilyl group and having a molecular weight not greater than 1000, R 2 represents a C 1-10 hydrocarbon group or a C 1-10 hydrocarbon group having no active hydrogen and substituted with an Si, O, N or S atom, R 3 and R 4 each independently represents a C 1-20 alkyl group or aryl group, R 5 , R 6 , and R 7 each represents a C 1-20 alkyl group or aryl group or a C 1-12 alkoxy group and g stands for an integer from 1 to 3, and in the formula (2), R 8 and R 9 each represents a C 1-10 hydrocarbon group, a C 1-10 hydrocarbon group having no active hydrogen and substituted with an Si, O, N or S atom, or an organic group containing an N atom not adjacent to the N atom of an aminosilyl group and having a molecular weight not greater than 1000, and R 3 , R 4 , R 5 , R 6 , R 7 and g have the same meanings as defined in the formula (1)).