| 摘要 |
PURPOSE:To obtain the titled rubber excellent in flex resistance, tensile strength, resilience, etc., by coupling a specified random styrene/butadiene copolymer obtained by copolymerization in the presence of a vinylating agent and an allene compound with a coupling agent. CONSTITUTION:Styrene is copolymerized with butadiene in 1-20pts.wt., per pt.wt. monomer, hydrocarbon solvent in the presence of 0.3-3mmol, per 100g of monomer, of an organolithium catalyst, 0.01-50mol, per mol of catalyst, of a vinylating agent (e.g., ethylene glycol dialkyl ether) and an allene compound of formula III (wherein R is H or a 1-10C alkyl) in an amount satisfying relationships I and II [wherein S is a combined styrene content (wt%), V is a vinyl bond content (%) of the butadiene portion, and A/L is an allene compound/catalyst molar ratio] to obtain a random styrene/butadiene copolymer of a Mooney viscosity ML1+4-I of 20-60. This copolymer is coupled with an at least trifunctional silicon coupling agent to obtain the titled rubber of a content of said S component of 15-35wt%, a V component content of 20-40wt% and a Mooney viscosity ML1+4-C after coupling of 80-140 and an ML1+4-C to ML1+4-I ratio of 2-4.
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