Production of rubbery isoolefin polymers
    64.
    发明授权
    Production of rubbery isoolefin polymers 失效
    橡胶异烯烃聚合物的生产

    公开(公告)号:US5182333A

    公开(公告)日:1993-01-26

    申请号:US791764

    申请日:1991-11-12

    IPC分类号: C08F10/10 C08L23/22 C08L23/28

    摘要: A substantially gel free C.sub.4 to C.sub.7 isoolefin homopolymer rubber, butyl copolymer rubber, halogenated butyl rubber (e.g., chlorinated or brominated), or mixtures thereof, comprising a molecular weight distribution such that the ratio of the moments of said molecular weight distribution, Mz/Mw, is equal to or exceeds 2.0, and that portion of said molecular weight distribution which is equal to and greater than 4 times the peak molecular weight, Mp, comprises greater than 8 percent of the total polymer species, and Mp is greater than about 250,000 and wherein said polymer species of molecular weight less than Mp are substantially branch free. Various means are disclosed for effecting the molecular weight distribution including blending of homopolymers and/or copolymers of appropriate molecular weight and molecular weight distribution and direct polymerization using a functional reagent to introduce branching. The rubber compositions are particularly useful in applications in which butyl or halogenated butyl rubber is used and where it is desired to obtain high green strength in combination with an increased rate of stress relaxation. Such polymers are particularly well suited for use in tire innerliner compositions.

    摘要翻译: 基本上不含凝胶的C4至C7异烯烃均聚物橡胶,丁基共聚物橡胶,卤化丁基橡胶(例如,氯化或溴化)或其混合物,其包含分子量分布,使得所述分子量分布的时间比Mz / Mw等于或超过2.0,等于和大于峰分子量Mp的4倍的分子量分布的那部分包含大于总聚合物种类的8%,并且M p大于约 250,000,并且其中分子量小于Mp的所述聚合物种类基本上无分支。 公开了用于实现分子量分布的各种方法,包括使用适当的分子量和分子量分布的均聚物和/或共聚物的共混,并使用官能试剂引入支化的直接聚合。 橡胶组合物在使用丁基或卤代丁基橡胶的应用中特别有用,并且其中期望获得高的绿色强度并且结合增加的应力松弛速率。 这种聚合物特别适用于轮胎内衬组合物。

    Rubbery isoolefin polymers exhibiting improved processability
    65.
    发明授权
    Rubbery isoolefin polymers exhibiting improved processability 失效
    橡胶树脂聚合物展现出改进的可加工性

    公开(公告)号:US5071913A

    公开(公告)日:1991-12-10

    申请号:US131938

    申请日:1987-12-11

    摘要: A substantially gel free C.sub.4 to C.sub.7 isoolefin homopolymer rubber, butyl copolymer rubber, halogenated butyl rubber (e.g., chlorinated or brominated), or mixtures thereof, comprising a molecular weight distribution such that the ratio of the moments of said molecular weight distribution, Mz/Mw, is equal to or exceeds 2.0, and that portion of said molecular weight distribution which is equal to and greater than 4 times the peak molecular weight, Mp, comprises greater than 8 percent of the total polymer species, and Mp is greater than about 250,000 and wherein said polymer species of molecular weight less than Mp are substantially branch free. Various means are disclosed for effecting the molecular weight distribution including blending of homopolymers and/or copolymers of appropriate molecular weight and molecular weight distribution and direct polymerization using a functional reagent to introduce branching. The rubber compositions are particularly useful in applications in which butyl or halogenated butyl rubber is used and where it is desired to obtain high green strength in combination with an increased rate of stress relaxation. Such polymers are particularly well suited for use in tire innerliner compositions.