Conjugated diolefin (co)polymer rubber, process for producing (co)polymer rubber, rubber composition, composite, and tire

A conjugated diolefin (co)polymer rubber, which is represented by the following formula (1) or (2):

• wherein P is a (co)polymer chain of a conjugated diolefin or a conjugated diolefin and an aromatic vinyl compound, R1 is an alkylene group having 1 to 12 carbon atoms, R2 and R3 are each independently an alkyl group having 1 to 20 carbon atoms, an allyl group or an aryl group, n is an integer of 1 or 2, m is an integer of 1 or 2, and k is an integer of 1 or 2, with the proviso that n+m+k is an integer of 3 or 4,
• wherein P, R1, R2 and R3 have the same definitions as given for the above-mentioned formula (1), j is an integer of 1 to 3, and h is an integer of 1 to 3, with the proviso that j+h is an integer of 2 to 4.