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    Branched Low and Medium Density Polyethylene
    2.
    发明申请
    Branched Low and Medium Density Polyethylene 审中-公开
    支链中低密度聚乙烯

    公开(公告)号：US20110172322A1

    公开(公告)日：2011-07-14

    申请号：US12296966

    申请日：2007-04-13

    Applicant: Jacques Michel ,  Guy Debras ,  Philippe Bodart ,  Mieke Dams ,  Pascal Charlier

    Inventor： Jacques Michel ,  Guy Debras ,  Philippe Bodart ,  Mieke Dams ,  Pascal Charlier

    IPC: C08F210/02 ,  C08F4/78 ,  C08F8/00 ,  C09D123/08 ,  C08J9/00

    CPC classification number: C08F210/16 ,  C08F10/02 ,  C08F4/24 ,  C08F210/14 ,  C08F2500/12 ,  C08F2500/04 ,  C08F2500/09 ,  C08F2500/19

    Abstract: The invention relates to a long chain branched medium and low density polyethylene having a combination of the following properties: a) a density of from 0.910 to 0.945 g/cm3; b) an HLMI of from 2 to 150 dg/min and an MI2 of from 0.01 to 2 dg/min; c) a polydispersity index (PDI) Mw/Mn of at least 7, wherein Mw is the weight average molecular weight and Mn is the number average molecular weight of the polyethylene; and d) and a minimum amount of long chain branching measured by a value selected from one of grheo and LCBI. The invention also relates to a process for obtaining said polyethylene comprising the following steps: a) injecting ethylene, one or more alpha-olefinic comonomers comprising 3 to 10 carbon atoms and an activated chromium-based catalyst into a gas phase polymerisation reactor; b) copolymerising said ethylene and comonomer in said reactor in the gas phase; and c) retrieving an ethylene copolymer having a density of from 0.910 to 0.945 g/cm3 from said reactor; said activated catalyst having a chromium concentration of at least 0.1 wt-% and of at most 1.0 wt-% based on the weight of the titanated chromium-based catalyst and a titanium concentration of from 1 wt-% to 5 wt-% based on the weight of the titanated chromium-based catalyst, whereby the catalyst was titanated with vaporised titanium compound and activated at a temperature of at least 500° C.

    Abstract translation: 本发明涉及具有以下特性的组合的长链支化介质和低密度聚乙烯：a）0.910至0.945g / cm 3的密度; b）HLMI为2至150dg / min，MI2为0.01至2dg / min; c）多分散指数（PDI）Mw / Mn至少为7，其中Mw是重均分子量，Mn是聚乙烯的数均分子量; 和d）和通过选自格莱和LCBI之一的值测量的最小量的长链分支。 本发明还涉及一种获得所述聚乙烯的方法，包括以下步骤：a）将乙烯，一种或多种含有3至10个碳原子的α-烯烃共聚单体和活化的铬基催化剂注入气相聚合反应器中; b）在气相中在所述反应器中共聚所述乙烯和共聚单体; 和c）从所述反应器中回收密度为0.910至0.945g / cm 3的乙烯共聚物; 所述活化催化剂的铬浓度基于钛酸化铬基催化剂的重量为至少0.1重量％至多1.0重量％，钛浓度为1重量％至5重量％，基于 钛酸铬催化剂的重量，由此催化剂用蒸发的钛化合物钛化并在至少500℃的温度下活化

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