Method for Transitioning Between Incompatible Olefin Polymerization Catalyst Systems
    42.
    发明申请
    Method for Transitioning Between Incompatible Olefin Polymerization Catalyst Systems 有权
    不相容的烯烃聚合催化剂体系的转化方法

    公开(公告)号:US20110294957A1

    公开(公告)日:2011-12-01

    申请号:US13133803

    申请日:2009-12-17

    摘要: A method for transitioning from a Ziegler-Natta to a Phillips catalyst system for the olefin polymerization reaction in one reactor, preferably a gas phase reactor, is described. The method comprises the steps of a) discontinuing a first olefin polymerization reaction performed in the presence of the Ziegler-Natta catalyst system; b) performing a second olefin polymerization reaction in the presence of a further catalyst system comprising catalyst components (A) and (B) producing, respectively, a first and a second polyolefin fraction, wherein the Mw of the first polyolefin fraction is less than the Mw of the second polyolefin fraction and the initial activity of catalyst component (A) exceeds the initial activity of catalyst component (B); and c) performing a third olefin polymerization reaction the presence of the Phillips catalyst system. Thanks to this method, there is no need to empty the reactor after each olefin polymerization reaction, and the transitioning time needed to attain the desired quality of the polyolefin obtained in each olefin polymerization reaction subsequent to the first one is sufficiently short to permit a quick and reliable change of production.

    摘要翻译: 描述了在一个反应​​器,优选气相反应器中从齐格勒 - 纳塔过渡到用于烯烃聚合反应的菲利普斯催化剂体系的方法。 该方法包括以下步骤:a)停止在齐格勒 - 纳塔催化剂体系存在下进行的第一种烯烃聚合反应; b)在另外的催化剂体系存在下进行第二烯烃聚合反应,所述催化剂体系包含分别产生第一和第二聚烯烃部分的催化剂组分(A)和(B),其中第一聚烯烃部分的Mw小于 第二聚烯烃级分的Mw和催化剂组分(A)的初始活性超过催化剂组分(B)的初始活性; 和c)进行第三烯烃聚合反应的存在的菲利浦催化剂体系。 由于这种方法,在每个烯烃聚合反应之后不需要清空反应器,并且在第一个烯烃聚合反应之后获得的每个烯烃聚合反应中获得的聚烯烃所需的质量所需的转化时间足够短,以使快速 可靠的生产变更。

    MULTISTAGE PROCESS FOR THE POLYMERIZATION OF OLEFINS
    48.
    发明申请
    MULTISTAGE PROCESS FOR THE POLYMERIZATION OF OLEFINS 失效
    烯烃聚合的多种方法

    公开(公告)号:US20110003948A1

    公开(公告)日:2011-01-06

    申请号:US12735218

    申请日:2008-12-23

    IPC分类号: C08F2/01

    摘要: A multistage process for the homo or copolymerization of ethylene carried out in the presence of a catalyst system comprising at least one polymerization catalyst (A) based on a late transition metal component having a tridentate ligand which bears at least two ortho.ortho-disubstituted aryl radicals, at least one Ziegler polymerization catalyst (B), and at least a Lewis acid activating compound (C), wherein the molar ratio of the metal of the activating compound (C) to the late transition metal of catalyst (A) is different in the two polymerizations steps. Catalysts (A) and (B) may be selectively controlled by varying the amount of activating compound (C).

    摘要翻译: 在含有至少一种聚合催化剂(A)的催化剂体系存在下进行的乙烯均相或共聚的多级方法,所述催化剂体系基于具有三齿配体的后过渡金属组分,其具有至少两个邻位二取代的芳基 自由基,至少一种齐格勒聚合催化剂(B)和至少一种路易斯酸活化化合物(C),其中活化化合物(C)的金属与催化剂(A)的后过渡金属的摩尔比是不同的 在两个聚合步骤中。 催化剂(A)和(B)可以通过改变活化化合物(C)的量来选择性地控制。

    Polyethylene and catalyst composition for its preparation
    49.
    发明申请
    Polyethylene and catalyst composition for its preparation 有权
    聚乙烯和催化剂组合物的制备

    公开(公告)号:US20100311925A1

    公开(公告)日:2010-12-09

    申请号:US12800998

    申请日:2010-05-27

    申请人: Shahram Mihan

    发明人: Shahram Mihan

    摘要: Polyethylene which comprises ethylene homopolymers and copolymers of ethylene with α-olefins and has a molar mass distribution width Mw/Mn of from 6 to 100, a density of from 0.89 to 0.97 g/cm3, a weight average molar mass Mw of from 5000 g/mol to 700 000 g/mol and has from 0.01 to 20 branches/1000 carbon atoms and at least 0.5 vinyl groups/1000 carbon atoms, wherein the 5-50% by weight of the polyethylene having the lowest molar masses have a degree of branching of less than 10 branches/1000 carbon atoms and the 5-50% by weight of the polyethylene having the highest molar masses have a degree of branching of more than 2 branches/1000 carbon atoms, a process for its preparation, catalysts suitable for its preparation and also fibers, moldings, films or polymer blends in which this polyethylene is present.

    摘要翻译: 聚乙烯,其包含乙烯均聚物和乙烯与α-烯烃的共聚物,其摩尔质量分布宽度Mw / Mn为6至100,密度为0.89至0.97g / cm 3,重均摩尔质量Mw为5000g / mol至700000g / mol,具有0.01至20个支链/ 1000个碳原子和至少0.5个乙烯基/ 1000个碳原子,其中5-50重量%的具有最低摩尔质量的聚乙烯具有 小于10个支链/ 1000个碳原子的支链和5-50重量%的具有最高摩尔质量的聚乙烯具有多于2个分支/ 1000个碳原子的支化度,其制备方法,适用于 其制备方法以及其中存在该聚乙烯的纤维,模制品,膜或聚合物共混物。