Foamable polypropylene polymer
    24.
    发明授权
    Foamable polypropylene polymer 失效
    可发泡聚丙烯聚合物

    公开(公告)号:US06174930B1

    公开(公告)日:2001-01-16

    申请号:US09433989

    申请日:1999-11-04

    IPC分类号: C08J900

    摘要: This invention relates generally to foamable polypropylene polymer, and more particularly a foamable isotactic polypropylene homopolymer obtained from metallocene catalysis and to their methods of production and articles formed therefrom. The foamable polypropylene polymer has molecular weight distributions and densities that fall within broad ranges. The foamable polypropylene polymer may be prepared in a multiple stage polymerization process using the same metallocene component in at least two stages.

    摘要翻译: 本发明一般涉及可发泡聚丙烯聚合物,更具体地说是由茂金属催化得到的可发泡全同立构聚丙烯均聚物及其制备方法和由其形成的制品。 可发泡聚丙烯聚合物具有分布范围内的分子量分布和密度。 可发泡聚丙烯聚合物可以在至少两个阶段中使用相同的茂金属组分的多阶段聚合方法中制备。

    Process of producing thermoplastic polymer blends
    29.
    发明授权
    Process of producing thermoplastic polymer blends 有权
    生产热塑性聚合物共混物的方法

    公开(公告)号:US07919561B2

    公开(公告)日:2011-04-05

    申请号:US11446794

    申请日:2006-06-05

    摘要: A process is described for producing a polymer blend comprising (a) a first polymer component comprising a crystalline propylene polymer and (b) a second polymer component comprising a copolymer of propylene with at least one comonomer, wherein the copolymer comprises between about 7 wt % and about 28 wt % of comonomer and the copolymer has a heat of fusion of 0.5 to 70 J/g and an mm triad tacticity of 75% or greater. The process comprises polymerizing propylene under first polymerization conditions in a polymerization reaction zone to produce a first effluent comprising a crystalline propylene polymer containing no more than 10% by weight of other monomers, the first polymerization conditions comprising a first reaction temperature between about 50° C. and about 100° C. Propylene is then copolymerized with at least one comonomer under second polymerization conditions in the presence of a metallocene catalyst and at least part of said first effluent in a slurry polymerization reaction zone to produce the second polymer component as a blend with the first polymer component, the second polymerization conditions comprising a second reaction temperature at least 7° C. less than the first reaction temperature.

    摘要翻译: 描述了一种制备聚合物共混物的方法,其包含(a)包含结晶丙烯聚合物的第一聚合物组分和(b)包含丙烯与至少一种共聚单体的共聚物的第二聚合物组分,其中所述共聚物包含约7重量% 和约28重量%的共聚单体,共聚物的熔融热为0.5〜70J / g,mm三元组立构规整度为75%以上。 该方法包括在聚合反应区中在第一聚合条件下聚合丙烯以产生包含不超过10重量%的其它单体的结晶丙烯聚合物的第一流出物,第一聚合条件包括约50℃的第一反应温度 然后约100℃。然后,丙烯在第二聚合条件下,在茂金属催化剂和至少部分所述第一流出物在淤浆聚合反应区中的存在下,与至少一种共聚单体共聚以产生作为共混物的第二聚合物组分 与第一聚合物组分相比,第二聚合条件包括比第一反应温度低至少7℃的第二反应温度。