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25 条记录 (耗时 0.025 秒)

    Ozone-resistant butyl elastomer
    13.
    发明授权
    Ozone-resistant butyl elastomer 失效
    耐臭氧丁基弹性体

    公开(公告)号：US5182350A

    公开(公告)日：1993-01-26

    申请号：US605679

    申请日：1990-10-30

    申请人： James V. Fusco ,  Hsien-Chang Wang ,  Kenneth W. Powers

    发明人： James V. Fusco ,  Hsien-Chang Wang ,  Kenneth W. Powers

    IPC分类号： C08F210/12

    CPC分类号： C08F210/12

    摘要： Ozone resistant vulcanizable copolymers of isoolefins with non-conjugated dienes of the general formula: ##STR1## where R.sub.1 is ##STR2## and R.sub.2 is alkyl of 1 to 6 carbon atoms and vulcanizates thereof. The copolymers are prepared by polymerization in the presence of Lewis acids.

    摘要翻译： 异烯烃与具有以下通式的非共轭二烯的耐臭氧可硫化共聚物：其中R 1是R 1和R 2是1至6个碳原子的烷基和其硫化产物。 共聚物通过在路易斯酸存在下聚合制备。

    Homogeneous styrene/isoolefin copolymers
    15.
    发明授权
    Homogeneous styrene/isoolefin copolymers 失效
    均相苯乙烯/异烯烃共聚物

    公开(公告)号：US3948868A

    公开(公告)日：1976-04-06

    申请号：US116222

    申请日：1971-02-17

    申请人： Kenneth W. Powers

    发明人： Kenneth W. Powers

    IPC分类号： C08F2/04 ,  C08F210/10 ,  C08F212/06

    CPC分类号： C08F210/10 ,  C08F212/06

    摘要： A process for preparing a homogeneous random polymer of two or more cationically polymerizable monomers having the general formula: ##EQU1## wherein R.sub.1 is alkyl, alkenyl, phenyl, aralkyl or alkaryl, R.sub.2 is H, alkenyl or alkyl and where R.sub.2 is H, R.sub.1 must be phenyl or alkylaryl, which comprises continuously reacting said monomers in a mixed solvent system comprising a polar organic solvent and a nonpolar, nonaromatic hydrocarbon solvent, said polymerization being carried out in a well-stirred reactor in the presence of a Friedel-Crafts catalyst. The preferred polymer is a homogeneous random styrene-isobutylene copolymer which is prepared by continuously reacting in solution about 10 to about 90 parts by weight of styrene with about 90 to about 10 parts by weight of isobutylene in a mixed solvent system comprising a polar organic solvent and a nonpolar nonaromatic hydrocarbon solvent.

    摘要翻译： 制备具有以下通式的两种或更多种可阳离子聚合单体的均相无规聚合物的方法：其中R 1是烷基，烯基，苯基，芳烷基或烷芳基，R 2是H，烯基或烷基，其中R 2 是H，R 1必须是苯基或烷基芳基，其包括在包含极性有机溶剂和非极性非芳族烃溶剂的混合溶剂体系中连续反应所述单体，所述聚合在良好搅拌的反应器中在存在 Friedel-Crafts催化剂。 优选的聚合物是均匀的无规苯乙烯 - 异丁烯共聚物，其通过在约10至约90重量份的苯乙烯和约90至约10重量份的异丁烯的溶液中在包含极性有机溶剂的混合溶剂体系中连续反应制备 和非极性非芳族烃溶剂。

    Process for preparing low bulk viscosity polymers
    16.
    发明授权
    Process for preparing low bulk viscosity polymers 失效
    制备低体积粘度聚合物的方法

    公开(公告)号：US3932371A

    公开(公告)日：1976-01-13

    申请号：US429129

    申请日：1973-12-28

    申请人： Kenneth W. Powers

    发明人： Kenneth W. Powers

    IPC分类号： C08F10/00 ,  C08F36/04 ,  C08F2/06 ,  C08F4/14 ,  C08F4/52

    CPC分类号： C08F10/00 ,  C08F36/04

    摘要： Polymerization reactions may be carried out in a solvent at a temperature which is above its lower critical solution temperature thereby resulting in a two-phase system comprising a solvent phase containing dissolved therein monomers and low molecular weight fractions of polymer and dispersed fluid phase comprising a solution of solvent in the higher molecular weight fraction of polymer being formed.This process technique is particularly advantageous in the preparation of low molecular weight isoolefin conjugated diolefin copolymers. In particular, propane has been found to be an ideal solvent for the isoolefin conjugated diolefin polymerization processes.The use of this type of polymerization process results in a low viscosity system having excellent heat transfer and low fouling characteristics.

    摘要翻译： 聚合反应可以在溶剂中在高于其较低临界溶解温度的温度下进行，由此得到包含溶解在其中的溶剂相的两相体系，聚合物的低分子量级分和包含溶液的分散流体相 在形成的聚合物的较高分子量部分中的溶剂。