PURPOSE: To obtain a modified diene polymer rubber having excellent repulsive resilience, wet-gripping performance, mechanical characteristics and abrasion resistance and suitable for tire, etc., by reacting a specific active conjugated diene polymer rubber with a specific azodicarboxylic acid ester compound.
CONSTITUTION: This modified diene polymer rubber can be produced by polymerizing a conjugated diene monomer such as 1,3-butadiene or a conjugated diene monomer and an aromatic vinyl monomer such as styrene in a hydrocarbon solvent in the presence of an alkali metal catalyst and reacting the obtained active conjugated diene polymer rubber having an alkali metal terminal with an azodicarboxylic acid ester compound of the formula [R1 and R2 are 3-8C alkyl, (substituted)phenyl or (substituted)benzyl] such as diisopropyl azodicarboxylate. The content of the rubber in the rubber component is preferably ≥10wt.%.
WAKATSUKI CHIKU
TSUJI MITSUSHIGE
NAGASAKI HIDEO
INUI NAOKI
