Elastomeric copolymers of ethylene and propylene
    5.
    发明授权
    Elastomeric copolymers of ethylene and propylene 失效
    乙烯和丙烯的弹性共聚物

    公开(公告)号:US06331600B1

    公开(公告)日:2001-12-18

    申请号:US08841473

    申请日:1997-04-22

    IPC分类号: C08F21016

    摘要: Novel copolymers of ethylene with propylene and optionally with minor proportions of a diene or polyene having good elastomeric properties in their uncured state. The copolymers are characterized by a structure in which the propylene is partially present in the form of short isotactic sequences. Tension set values (200%) of less than 15 are obtained by when the ethylene/propylene ratio has specific values and the intrinsic viscosity values are higher than 3.

    摘要翻译: 乙烯与丙烯的新型共聚物和任选的少量二烯或其未固化状态下具有良好弹性体性质的多烯的共聚物。 共聚物的特征在于其中丙烯以短全同立构序列的形式部分存在的结构。 当乙烯/丙烯比具有特定值并且特性粘度值高于3时,获得小于15的张力设定值(200%)。

    Elastomeric copolymers of ethylene with &agr;-olefins and process for their preparation
    8.
    发明授权
    Elastomeric copolymers of ethylene with &agr;-olefins and process for their preparation 失效
    乙烯与α-烯烃的弹性共聚物及其制备方法

    公开(公告)号:US06403737B1

    公开(公告)日:2002-06-11

    申请号:US09694160

    申请日:2000-10-24

    IPC分类号: C08F442

    摘要: A process for the preparation of amorphous copolymers of ethylene with &agr;-olefins and optionally minor amounts of polyenes are disclosed, which have the following characteristics: (A) the % by mole content of &agr;-olefin in the copolymer (%&agr;) and the ratio between the molar amount of &agr;-olefin diads and the molar content of &agr;-olefin in the copolymer (&agr;&agr;/&agr;) satisfy the following relationship: (%&agr;)−250 (&agr;&agr;/&agr;)≧10 (B) less than 2% of the CH2 groups in the polymeric chain are in sequences (CH2)n, wherein n is an even number. These copolymers are obtained by operating in the presence of particular metallocene-based catalysts having two fluorenyl groups joined together through a bridging group.

    摘要翻译: 公开了一种制备乙烯与α-烯烃和任选少量多烯的无定形共聚物的方法,其具有以下特征:(A)共聚物中α-烯烃的摩尔%摩尔%(%)和 α-烯烃二单元摩尔量与共聚物中α-烯烃的摩尔含量之比(αalpha/α)满足以下关系:(B)聚合物链中少于2%的CH 2基团为顺序( CH2)n,其中n是偶数。这些共聚物通过在具有通过桥连基团连接在一起的两个芴基的特定茂金属基催化剂存在下操作而获得。