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    • 8. 发明授权
    • Block copolymer
    • 嵌段共聚物
    • US5585443A
    • 1996-12-17
    • US517765
    • 1995-08-22
    • Yoichi OzawaHideo Takeichi
    • Yoichi OzawaHideo Takeichi
    • C08F297/04C08F293/00
    • C08F297/04
    • A block copolymer comprises block A containing as a main component thereof a homopolymer consisting of units of a vinylaromatic hydrocarbon (VAH), block B consisting of units of a conjugated diene (CD), and block C consisting of VAH and CD, is represented by General Formulae (I) or (II), and has a structure in which blocks A, B, and C are repeated in the order shown in the General Formulae (I) or (II). The block copolymer contains 15 to 98% by weight of a block consisting of 20 to less than 200 VAH, 10% or less by weight of a block consisting of 200 or more VAH, 1 to 70% by weight of an isolated single VAH, and a block consisting of 2 to less than 20 VAH in an amount to make up the rest, each based on total VAH; 15 to 65% by weight of total VAH; 85 to 35% by weight of total CD; and a number-average molecular weight of 5.times.10.sup.4 to 150.times.10.sup.4. Another block copolymer has a structure in which the block copolymer described above is coupled by a polyfunctional coupling agent, and is represented by General Formulae (III) or (IV), wherein Y represents the residue of the polyfunctional coupling agent. The block copolymers are advantageously used for a tire tread rubber having higher abrasion resistance, higher tensile strength at high temperatures, and the like, in good balance without adverse effects on other properties.(C).sub.n --A--(C--B--C--A).sub.m --(C--B).sub.p --(C).sub.q HGeneral formula I(C).sub.n --B--(C--A--C--B).sub.m --(C--A).sub.p --(C).sub.q HGeneral formula II[(C).sub.n --A--(C--B--C--A).sub.m --(C--B).sub.p --(C).sub.q ].sub.x YGeneral formula III[(C).sub.n --B--(C--A--C--B).sub.m --(C--A).sub.p --(C).sub.q ].sub.x YGeneral formula IV
    • 嵌段共聚物包括含有由乙烯基芳族烃(VAH),由共轭二烯(CD)单元组成的嵌段B和由VAH和CD组成的嵌段C组成的均聚物作为主要成分的嵌段A,其由 通式(I)或(II),并且具有以通式(I)或(II)所示的顺序重复嵌段A,B和C的结构。 嵌段共聚物含有15至98重量%的由20至小于200VAH,10重量%或更少的由200个或更多个VAH组成的嵌段,1至70重量%的分离的单一VAH, 以及由2至小于20VAH组成的块,其量为组成其余部分,每块基于总VAH; 占总VAH的15〜65重量% 85〜35重量%的总CD; 数均分子量为5×104〜150×104。 另一种嵌段共聚物具有上述嵌段共聚物通过多官能偶联剂偶联的结构,并且由通式(III)或(IV)表示,其中Y表示多官能偶联剂的残基。 嵌段共聚物有利地用于具有较高耐磨性,高温下较高拉伸强度的轮胎胎面橡胶,并且在良好的平衡下不会对其它性能产生不利影响。(C)nA-(CBCA)m-(CB) 对(C)qH通式I(C)nB-(CACB)m-(CA)p-(C)qH通式II [(C)nA-(CBCA)m-(CB)p-(C)q] x Y通式III [(C)nB-(CACB)m-(CA)p-(C)q] x Y通式IV