Method for producing supported chrome catalysts and the use thereof for the polymerization of olefins
    4.
    发明授权
    Method for producing supported chrome catalysts and the use thereof for the polymerization of olefins 有权
    负载型铬催化剂的制备方法及其在烯烃聚合中的应用

    公开(公告)号:US06608151B1

    公开(公告)日:2003-08-19

    申请号:US10070341

    申请日:2002-02-28

    IPC分类号: C08F424

    摘要: The invention relates to a method for producing supported chromium catalysts for the polymerisation of olefins by loading a xerogel support with chromium by adding to the xerogel support a volume of a 0.025 to 15% by weight solution of a chromium compound or a volume of a solution comprising from 0.025 to 7.8% by weight of Cr which is essentially converted into a chromium(VI) compound on heating in a water-free stream of gas under oxidizing conditions at temperatures in the range from 300 to 1100° C. for a period of from 10 to 1000 minutes in a solvent which comprises a maximum of 20% by weight of water, and subsequently evaporating the solvent, where the volume of the chromium salt solution employed is smaller than the pore volume of the xerogel support.

    摘要翻译: 本发明涉及通过向干凝胶载体中加入0.025至15重量%的铬化合物或一定体积的溶液的体积来生产用于使烯烃聚合的负载型铬催化剂的方法, 包括0.025至7.8重量%的Cr,其在氧化条件下在300至1100℃的温度范围内在无水气体流中加热,基本上转化为铬(VI)化合物一段时间 在包含最多20重量%的水的溶剂中10至1000分钟,然后蒸发溶剂,其中所用的铬盐溶液的体积小于干凝胶载体的孔体积。

    Suspension polymers based on acrylates and methacrylates
    9.
    发明授权
    Suspension polymers based on acrylates and methacrylates 失效
    基于丙烯酸酯和甲基丙烯酸酯的悬浮聚合物

    公开(公告)号:US5567785A

    公开(公告)日:1996-10-22

    申请号:US107076

    申请日:1993-08-17

    IPC分类号: C08F2/18 C08F20/12 C08F2/00

    CPC分类号: C08F20/12

    摘要: Polymers that can be obtained by suspension polymerization of 50 to 100% by weight of at least one compound selected from the group comprising C.sub.1 -C.sub.18 -alkyl esters of acrylic acid and methacrylic acid, and 0 to 50% by weight of further, free radical-polymerizable monomers in the presence of a buffer selected from the group comprising citric acid, alkali metal citrates, alkaline earth metal citrates and ammonium citrates, and also a process for preparing these polymers and their use in the production of molded articles.

    摘要翻译: 可以通过悬浮聚合获得的聚合物为50-100重量%的至少一种选自丙烯酸和甲基丙烯酸的C 1 -C 18烷基酯的化合物和0至50重量%的另外的自由基 在可以选自柠檬酸,碱金属柠檬酸盐,碱土金属柠檬酸盐和柠檬酸铵的缓冲剂的存在下存在的可共聚单体,以及制备这些聚合物的方法及其在制备模塑制品中的用途。