| 摘要 |
PURPOSE:To produce the titled copolymer containing styrene unit in the copolymer chain forming a specific chain distribution, and useful for tire, etc., by reacting a copolymer having Li bonded to the terminal of the copolymer chain with a urea derivative. CONSTITUTION:The novel copolymer having a Mooney viscosity of 30-150 (ML1+4, 100 deg.C), bonded styrene content of 5-45(wt)%, short styrene chain content consisting of single styrene unit of >=40% of the bonded styrene, and long styrene chain content consisting of >=8 styrene units of <=5%, can be produced by copolymerizing styrene and butadiene using an organic Li compound (e.g. n-propyllithium) as a polymerization initiator, and reacting the resultant Li- terminated copolymer with a urea derivative of formula (R1 and R2 are 1-4C alkyl or alkoxyalkyl; Y is O or S; n is 2-4). EFFECT:The balance of impact resilience, wet-skid resistance and abrasion resistance can be remarkably improved.
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