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    • 6. 发明授权
    • Block copolymers for a sheet or film
    • 用于片材或薄膜的嵌段共聚物
    • US3939224A
    • 1976-02-17
    • US423617
    • 1973-12-10
    • Shigeki HoriieShin-Ichiro AsaiYoshihisa Moriya
    • Shigeki HoriieShin-Ichiro AsaiYoshihisa Moriya
    • C08F297/04C08F236/00C08F4/46
    • C08F297/042
    • First polymerization of a mixture of styrene-type monomers and conjugated diene monomers containing 30 to 70% by weight of styrene-type monomers is carried out, and when 40 or more of the diene monomers have been converted to a copolymer, there are then added styrene-type monomers in such an amount that the content of styrene units accounts for a proportion of 70 to 85% by weight of the finally obtained block copolymers, followed by completion of the polymerization. Alternatively, when all the diene monomers added have been converted to the copolymer, the second polymerization of styrene type monomers is carried out in the presence of a small amount of conjugated dienes as a polymerization retardant. Block copolymers obtained thus are useful for sheet or film molding having good low-temperature impact strength.
    • 进行苯乙烯类单体和含有30〜70重量%苯乙烯类单体的共轭二烯单体的混合物的首次聚合,当40个以上的二烯单体转化为共聚物时, 苯乙烯类单体的量使得苯乙烯单元的含量占最终获得的嵌段共聚物的70〜85重量%的比例,然后完成聚合。 或者,当所有加入的二烯单体已经转化为共聚物时,苯乙烯类单体的第二聚合在少量作为聚合阻燃剂的共轭二烯的存在下进行。 因此得到的嵌段共聚物可用于具有良好低温冲击强度的片或薄膜成型。