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160 条记录 (耗时 0.057 秒)

    Ethylene cone-shell polymer powders
    107.
    发明授权
    Ethylene cone-shell polymer powders 失效
    乙烯锥壳聚合物粉末

    公开(公告)号：US5459203A

    公开(公告)日：1995-10-17

    申请号：US336037

    申请日：1994-11-08

    申请人： Rolf L. Geerts ,  Elizabeth A. Benham ,  Max P. McDaniel

    发明人： Rolf L. Geerts ,  Elizabeth A. Benham ,  Max P. McDaniel

    IPC分类号： C08F4/22 ,  C08F4/06 ,  C08F4/42 ,  C08F4/54 ,  C08F4/60 ,  C08F4/69 ,  C08F10/00 ,  C08F255/02 ,  C08F110/02

    CPC分类号： C08F10/00 ,  Y10S525/902 ,  Y10S526/905

    摘要： A catalyst system for the polymerization of alpha-olefins comprising a chromium-containing catalyst and an yttrium-containing catalyst wherein the yttrium-containing catalyst is represented by the formula (Cp.sub.2 YX.sub.x).sub.y .multidot.M.sub.z L.sub.n, wherein Cp is cyclopentadienyl or cyclopentadienyl substituted with an alkyl or alkyl silyl radical, X is a halogen, M is an alkali metal, L is a suitable electron donor ligand, x is 1 or 2, y is 1 or 2, z is 0 or 1, and n is a number corresponding to the value needed to form a stable complex, with the proviso that when y is 2, z and n are 0 is provided. Also disclosed is a polymerization process employing such a catalyst system, and novel olefin polymers. Polymers thus produced exhibit high bulk density and a broad molecular weight distribution.

    摘要翻译： 包含含铬催化剂和含钇催化剂的α-烯烃聚合催化剂体系，其中含钇催化剂由式（Cp2YXx）yxMzLn表示，其中Cp是环烷基或被烷基取代的环戊二烯基， 烷基甲硅烷基，X是卤素，M是碱金属，L是合适的电子给体配体，x是1或2，y是1或2，z是0或1，并且n是对应于数值 需要形成稳定的络合物，条件是当y为2时，z和n为0。 还公开了使用这种催化剂体系的聚合方法和新的烯烃聚合物。 如此制备的聚合物表现出高的堆积密度和宽的分子量分布。

    Ethylene polymerization process
    108.
    发明授权
    Ethylene polymerization process 失效
    乙烯聚合工艺

    公开(公告)号：US5364915A

    公开(公告)日：1994-11-15

    申请号：US950525

    申请日：1992-09-25

    申请人： Elizabeth A. Benham ,  Max P. McDaniel

    发明人： Elizabeth A. Benham ,  Max P. McDaniel

    IPC分类号： C08F4/69 ,  C08F4/60 ,  C08F10/00 ,  C08F10/02 ,  C08F4/78

    CPC分类号： C08F10/02

    摘要： A process to produce a polyethylene composition that has less than 2 weight percent fines, based on the weight of said polyethylene composition, and a fluff bulk density greater than 25 pounds per cubic foot, said process comprising polymerizing ethylene in the presence of a trialkylaluminum compound, and a diluent that is essentially saturated with ethylene under slurry polymerization conditions that comprise a polymerization temperature from 104.degree. C. to 116.degree. C., with an activated catalyst system comprising (a) a catalyst support that comprises a silica compound, wherein said catalyst support has a pore volume less than 2 cubic centimeters per gram, (b) a catalyst that comprises a chromium compound, wherein the amount of chromium in said catalyst system is from about 0.1 to about 20 weight percent, wherein said weight percent is based on the total weight of said catalyst and catalyst support, and (c) a fluorine compound, wherein the amount of fluorine used is from about 0.1 to about 20 weight percent, wherein said weight percent is based on the total weight of said catalyst support.

    摘要翻译： 一种制备基于所述聚乙烯组合物重量小于2重量％的细粉和大于25磅/立方英尺的绒毛体积密度的聚乙烯组合物的方法，所述方法包括在三烷基铝化合物存在下聚合乙烯 和在包含聚合温度为104℃至116℃的淤浆聚合条件下基本上用乙烯饱和的稀释剂，其中活化催化剂体系包含（a）包含二氧化硅化合物的催化剂载体，其中所述 催化剂载体具有小于2立方厘米/克的孔体积，（b）包含铬化合物的催化剂，其中所述催化剂体系中的铬的量为约0.1至约20重量％，其中所述重量百分比为基 所述催化剂和催化剂载体的总重量，和（c）氟化合物，其中使用的氟的量为约0.1〜 的20重量％，其中所述重量百分数是基于所述催化剂载体的总重量。