| abstract |
PROBLEM TO BE SOLVED: To provide a modified polymer rubber having excellent rebound resilience and a method for producing the same. A modified polymer rubber obtained from the following steps. As the rubber composition, those containing 10% by weight or more of the modified polymer rubber in the rubber component are preferable. Step 1: A step of polymerizing a conjugated diene monomer or a conjugated diene monomer and an aromatic vinyl monomer in a hydrocarbon solvent in the presence of an alkali metal catalyst to obtain an active polymer having an alkali metal terminal, Step 2: The active polymer and the following formula (1) (wherein R 1 , R 2 and R 3 each independently represent an alkyl group having 1 to 4 carbon atoms, and R 4 and R 5 are each independently A step of obtaining a modified polymer rubber by reacting with a compound represented by an alkyl group having 1 to 6 carbon atoms, wherein n represents 0 or an integer of 1 to 10. [Selection figure] None |