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    • 6. 发明申请
    • METHOD FOR PRODUCING COUPLED ASYMMETRIC POLYMERS
    • 生产偶联不对称聚合物的方法
    • WO1995007307A1
    • 1995-03-16
    • PCT/EP1994003037
    • 1994-09-09
    • SHELL INTERNATIONALE RESEARCH MAATSCHAPPIJ B.V.
    • SHELL INTERNATIONALE RESEARCH MAATSCHAPPIJ B.V.MASSE, Michael, AlanCHIN, Steven, SoohyunSTEVENS, Craig, Aldred
    • C08F297/04
    • C08F297/044C08F297/046
    • A process for preparing a coupled asymmetric block copolymer of a vinyl aromatic hydrocarbon and a conjugated diene which comprises: (a) adding sufficient anionic polymerization initiator to the vinyl aromatic hydrocarbon monomer to start polymerization of the vinyl aromatic hydrocarbon, (b) polymerizing the vinyl aromatic hydrocarbon for a time sufficient to form a first set of vinyl aromatic hydrocarbon blocks having a desired molecular weight, (c) adding sufficient anionic polymerization initiator to start polymerization of a second set of vinyl aromatic hydrocarbon blocks, (d) completing the polymerization of the vinyl aromatic hydrocarbon for a time such that the first set of vinyl aromatic hydrocarbon blocks continues to grow to the desired molecular weight and the second set of vinyl aromatic hydrocarbon blocks grows to a desired smaller molecular weight, (e) adding a conjugated diene and polymerizing it on the ends of the vinyl aromatic hydrocarbon blocks for a time sufficient to form vinyl aromatic hydrocarbon-conjugated diene arms of the desired molecular weight, and (f) adding a coupling agent and coupling the arms to form the asymmetric block copolymer.
    • 一种制备乙烯基芳族烃和共轭二烯的偶联不对称嵌段共聚物的方法,其包括:(a)向乙烯基芳族烃单体加入足够的阴离子聚合引发剂以开始乙烯基芳烃的聚合,(b) 芳烃在足以形成具有所需分子量的第一组乙烯基芳族烃嵌段的时间内,(c)加入足够的阴离子聚合引发剂以开始聚合第二组乙烯基芳族烃嵌段,(d)完成聚合反应 乙烯基芳族烃一段时间,使得第一组乙烯基芳族烃嵌段继续生长至所需分子量,第二组乙烯基芳族烃嵌段生长至所需的较小分子量,(e)加入共轭二烯和 在乙烯基芳族烃嵌段的末端聚合足够长的时间 以形成具有所需分子量的乙烯基芳族烃 - 共轭二烯臂,和(f)加入偶联剂并偶联臂形成不对称嵌段共聚物。