Elastomeric propylene polymers
    52.
    发明授权
    Elastomeric propylene polymers 有权
    弹性丙烯聚合物

    公开(公告)号:US06423793B1

    公开(公告)日:2002-07-23

    申请号:US09631160

    申请日:2000-08-03

    IPC分类号: C08F442

    摘要: A thermoplastic elastomer is provided comprising a branched olefin polymer having crystalline sidechains and an amorphous backbone wherein at least 90 mole percent of the sidechains are isotactic or syndiotactic polypropylene and at least 80 mole percent of the backbone is atactic polypropylene. Additionally, a process is provided for producing a thermoplastic elastomer composition comprising: a) contacting, in solution, at a temperature from about 90° C. to about 120° C., propylene monomers with a catalyst composition comprising a chiral, stereorigid transition metal catalyst compound capable of producing isotactic or syndiotactic polypropylene; b) copolymerizing the product of a) with propylene and, optionally, one or more copolymerizable monomers, in a polymerization reactor using an achiral transition metal catalyst capable of producing atactic polypropylene; and c) recovering a branched olefin polymer.

    摘要翻译: 提供了一种热塑性弹性体,其包括具有结晶侧链和无定形骨架的支链烯烃聚合物,其中至少90摩尔%的侧链是全同立构或间同立构聚丙烯,并且至少80摩尔%的主链是无规聚丙烯。 此外,提供了一种制备热塑性弹性体组合物的方法,其包括:a)在约90℃至约120℃的温度下,在溶液中使丙烯单体与催化剂组合物接触,所述催化剂组合物包含手性立体刚性过渡金属 能够产生全同立构或间同立构聚丙烯的催化剂化合物; b)使用能够生产无规聚丙烯的非手性过渡金属催化剂,在聚合反应器中使a)的产物与丙烯和任选的一种或多种可共聚单体共聚; 和c)回收支链烯烃聚合物。

    Branched polypropylene compositions
    53.
    发明授权
    Branched polypropylene compositions 有权
    支链聚丙烯组合物

    公开(公告)号:US06225432B1

    公开(公告)日:2001-05-01

    申请号:US09375774

    申请日:1999-08-17

    IPC分类号: C08F11006

    摘要: Branched polypropylene compositions which have improved melt strength and good processability are provided. The branched polypropylene compositions of the present invention have a polydispersity of less than 4.0 and a melt point greater than 90° C. Further, the weight average branching index g of the polypropylene compositions is less than 0.95. Additionally, a novel process is provided for efficiently producing a branched polypropylene composition comprising: a) contacting propylene monomers in a reactor with an inert hydrocarbon solvent or diluent and a catalyst composition comprising one or more single site catalyst compounds capable of producing stereospecific polypropylene at a temperature from about 40° C. to about 120° C., wherein the ratio in the reactor of the propylene monomers to the inert hydrocarbon solvent or diluent is less than 9.0, and further, wherein the propylene monomers and the inert hydrocarbon solvent or diluent comprise at least 50 weight percent of the total contents of the reactor; and b) recovering a branched polypropylene composition having a polydispersity of less than or equal to 4.0 and a melting point greater than 90° C. wherein the weight average branching index, g, of the branched polypropylene composition is less than 0.95.

    摘要翻译: 提供了具有改进的熔体强度和良好加工性能的支化聚丙烯组合物。 本发明的支化聚丙烯组合物的多分散性小于4.0,熔点大于90℃。此外,聚丙烯组合物的重均分支指数g小于0.95。 另外,提供了一种用于有效生产支化聚丙烯组合物的新方法,其包括:a)使反应器中的丙烯单体与惰性烃溶剂或稀释剂和包含一种或多种能够产生立体有择聚丙烯的单中心催化剂化合物的催化剂组合物接触 温度为约40℃至约120℃,其中丙烯单体与惰性烃溶剂或稀释剂的反应器中的比例小于9.0,此外,其中丙烯单体和惰性烃溶剂或稀释剂 占反应器总含量的至少50重量%; 和b)回收多分散度小于或等于4.0且熔点大于90℃的支化聚丙烯组合物,其中支化聚丙烯组合物的重均分支指数g小于0.95。