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    Rubber composition for tire treads
    2.
    发明公开
    Rubber composition for tire treads 失效
    轮胎胎面用橡胶组合物

    公开(公告)号：EP0270927A2

    公开(公告)日：1988-06-15

    申请号：EP87117437.1

    申请日：1987-11-26

    申请人： SUMITOMO CHEMICAL COMPANY, LIMITED ,  SUMITOMO RUBBER INDUSTRIES LIMITED

    发明人： Saito, Yuichi ,  Yabuta, Takuzoh ,  Takao, Hiroyoshi ,  Imai, Akio ,  Tsuji, Mitsuji

    IPC分类号： C08F297/04 ,  B60C1/00 ,  C08G81/02

    CPC分类号： C08L21/00 ,  B60C1/0016 ,  C08F297/044 ,  C08L9/06 ,  C08L53/02 ,  C08L2666/24 ,  C08L2666/08

    摘要： A rubber composition suitable for tire treads having well-balanced excellent steering stability in cornering, wet skid characteristic, ice skid characteristic and rolling characteristic, and an excellent processability, which comprises a rubber component containing a block copolymer consisting essentially of a block A and a block B, obtained by conducting polymerization of an aromatic vinyl compound and a conjugated diene compound in a hydrocarbon solvent in the presence of an organolithium initiator and modifying with a coupling agent, and satisfying the following conditions (A) to (E);

    (A) the block A having a content of an aromatic vinyl compound of 5 to 20 % by weight and a content of 1,2-bonds in the conjugated diene component of 25 to 55 % by weight,
    (B) the block B having a content of an aromatic vinyl compound of 35 to 60 % by weight and a content of 1,2-bonds in the conjugated diene component of 20 to 70 % by weight,
    (C) the content of the block A in the block copolymer being from 20 to 80 % by weight,
    (D) the average content of the aromatic vinyl compound in the block copolymer being from 20 to 40 % by weight and the average content of 1,2-bonds in the conjugated diene component of the block copolymer being from 20 to 60 % by weight, and
    (E) at least 40 % by weight of the polymer chains of the block copolymer being a branched polymer formed by modification with a trifunctional or tetrafunctional coupling agent.

    摘要翻译： 一种适用于轮胎胎面的橡胶组合物，该组合物在转弯，湿滑特性，防冰特性和滚动特性方面具有良好的平衡优异操纵稳定性和优异的可加工性，该橡胶组合物包含含有基本上由嵌段A和 嵌段B，通过在有机锂引发剂存在下在烃溶剂中使芳香族乙烯基化合物和共轭二烯化合物聚合并用偶联剂进行改性而获得，并且满足以下条件（A）至（E）; （A）芳香族乙烯基化合物的含量为5〜20重量％，共轭二烯成分中的1,2-键含量为25〜55重量％的嵌段A，（B）嵌段B具有 芳香族乙烯基化合物的含量为35〜60重量％，共轭二烯成分中的1,2-键含量为20〜70重量％，（C）嵌段共聚物中嵌段A的含量为 （D）嵌段共聚物中的芳香族乙烯基化合物的平均含量为20〜40重量％，嵌段共聚物的共轭二烯成分中的1,2-键的平均含量为20〜80重量％ （E）嵌段共聚物的聚合物链的至少40重量％是通过用三官能或四官能偶联剂改性形成的支化聚合物。

    Elastomeric copolymer of aromatic vinyl compounds and butadiene
    8.
    发明公开
    Elastomeric copolymer of aromatic vinyl compounds and butadiene 失效
    的乙烯基芳族化合物和丁二烯的弹性体共聚物。

    公开(公告)号：EP0153697A2

    公开(公告)日：1985-09-04

    申请号：EP85101864.8

    申请日：1985-02-21

    申请人： SUMITOMO CHEMICAL COMPANY, LIMITED ,  SUMITOMO RUBBER INDUSTRIES LIMITED

    发明人： Yoshida, Nobuyuki ,  Okamoto, Yasushi ,  Imai, Akio ,  Seki, Tomoaki ,  Furukawa, Hiroshi ,  Saito, Yuichi

    IPC分类号： C08C19/44

    CPC分类号： C08C19/44

    摘要： An elastomeric copolymer of an aromatic vinyl compound and butadiene prepared by a solution polymerization method, which has a glass transition temperature of not less than -50°C and contains polymer chains modified with a trifunctional or tetrafunctional coupling agent, and which contains not less than 3 % by weight to less than 23 % by weight, based on the whole polymer chains, of polymer chains having a molecular weight of at least 5 times a molecular weight corresponding to a peak appearing on the low molecular weight side of a high performance liquid chromatogram of the elastomeric copolymer. The elastomer- ic copolymer has an excellent processability and shows a low rolling resistance and a high wet grip characteristic when used as a rubber component in tires.