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    Polymers having low levels of long chain branching and methods of making the same
    4.
    发明申请
    Polymers having low levels of long chain branching and methods of making the same 有权
    具有低水平长链支化的聚合物及其制备方法

    公开(公告)号：US20050239977A1

    公开(公告)日：2005-10-27

    申请号：US10829844

    申请日：2004-04-22

    申请人： Max McDaniel ,  Kathy Collins ,  Elizabeth Benham ,  Paul DesLauriers

    发明人： Max McDaniel ,  Kathy Collins ,  Elizabeth Benham ,  Paul DesLauriers

    IPC分类号： C08F4/06 ,  C08F10/02 ,  C08F110/02

    CPC分类号： C08F10/02 ,  C08F110/02 ,  C08F4/69 ,  C08F2500/17 ,  C08F2500/04 ,  C08F2500/12 ,  C08F4/025

    摘要： Methods of producing a polymer include contacting at least one olefin with a catalyst prepared by contacting a support comprising alumina with a sulfating agent and with chromium. Polymer compositions produced in this manner may exhibit relatively low levels of long chain branching and relatively high molecular weights. In an embodiment, polymer compositions with a PDI in a range of from about 6 to about 15 have MW values greater than about 300,000 g/mol and Eo values less than about 1×106 Pa.s. The polymer compositions may further have Theological breadths greater than about 0.25 and relaxation times less than about 10 seconds.

    摘要翻译： 制备聚合物的方法包括使至少一种烯烃与通过使包含氧化铝的载体与硫酸化剂和铬接触而制备的催化剂接触。 以这种方式制备的聚合物组合物可以表现出较低水平的长链支化和相对较高的分子量。 在一个实施方案中，PDI在约6至约15范围内的聚合物组合物的M值大于约300,000g / mol且小于等于 约1×10 6 Pa。 聚合物组合物还可以具有大于约0.25的神学宽度和小于约10秒的弛豫时间。

    Methods of preparing active chromium/alumina catalysts via treatment with sulfate
    5.
    发明申请
    Methods of preparing active chromium/alumina catalysts via treatment with sulfate 有权
    通过硫酸盐处理制备活性铬/氧化铝催化剂的方法

    公开(公告)号：US20050239641A1

    公开(公告)日：2005-10-27

    申请号：US10829850

    申请日：2004-04-22

    申请人： Max McDaniel ,  Kathy Collins ,  Elizabeth Benham ,  Paul DesLauriers

    发明人： Max McDaniel ,  Kathy Collins ,  Elizabeth Benham ,  Paul DesLauriers

    IPC分类号： B01J23/26 ,  B01J27/053 ,  B01J27/14 ,  C08F10/00 ,  C08F110/02

    CPC分类号： C08F10/00 ,  B01J23/26 ,  B01J27/053 ,  C08F4/63916 ,  C08F4/63925 ,  C08F110/02 ,  C08F4/69 ,  C08F2500/12 ,  C08F2500/04 ,  C08F4/025 ,  C08F4/22

    摘要： Methods of preparing a polymerization catalyst are provided that include contacting a support comprising alumina with a sulfating agent and with chromium. In an embodiment in which the chromium is provided from a chromium compound such as chromium oxide, the support may be calcined after loading the sulfating agent and the chromium on the support. Alternatively, the sulfating agent can be loaded on the support while calcining it. In another embodiment in which the chromium is provided from an organochromium compound, the support may be calcined after contacting it with the sulfating agent and before contacting it with the organochromium compound. Catalysts compositions formed by the foregoing method are provided. In an embodiment, catalyst compositions comprise chromium and a sulfate treated alumina support. The catalyst compositions have an activity for ethylene polymerization that is at least about 25% greater than an activity of the same catalyst without sulfate.

    摘要翻译： 提供制备聚合催化剂的方法包括使包含氧化铝的载体与硫酸化剂和铬接触。 在其中铬由铬化合物如氧化铬提供的实施方案中，可以在将硫酸化剂和铬负载在载体上之后煅烧载体。 或者，硫酸化剂可以在煅烧时装载到载体上。 在其中铬由有机铬化合物提供的另一个实施方案中，载体可以在与硫酸化剂接触之后并在与有机铬化合物接触之前被煅烧。 提供通过上述方法形成的催化剂组合物。 在一个实施方案中，催化剂组合物包含铬和硫酸盐处理的氧化铝载体。 催化剂组合物具有乙烯聚合的活性，其比不含硫酸盐的相同催化剂的活性大至少约25％。

    Ultra high molecular weight polyethylene fractions having narrow molecular weight distributions and methods of making and using the same
    9.
    发明申请
    Ultra high molecular weight polyethylene fractions having narrow molecular weight distributions and methods of making and using the same 有权
    具有窄分子量分布的超高分子量聚乙烯级分及其制备和使用方法

    公开(公告)号：US20050154169A1

    公开(公告)日：2005-07-14

    申请号：US10754373

    申请日：2004-01-09

    申请人： Chung Tso ,  Melvin Hildebrand ,  Paul DesLauriers ,  Youlu Yu

    发明人： Chung Tso ,  Melvin Hildebrand ,  Paul DesLauriers ,  Youlu Yu

    IPC分类号： C08F6/04 ,  C08F10/02 ,  C08F110/02

    CPC分类号： C08F6/04 ,  C08F110/02 ,  Y10T436/10 ,  C08L23/04 ,  C08F2500/01 ,  C08F2500/03

    摘要： Polymer fractions such as polyethylene fractions can be produced that have a PDI less than about 2.3 and a Mw greater than about 1,000,000 g/mol, 3,000,000 g/mol, or 6,000,000 g/mol. Such polyethylene fractions are separated from a UHMWPE parent polymer by first dissolving the parent polymer in a relatively good solvent. The conditions employed for such dissolution are selected to reduce the degradation of the parent polymer. The resulting parent solution is transported into a fractionation column in which a support is disposed. The fractionation column is thereafter operated at conditions effective to form a precipitate on the support comprising the desired polyethylene fraction. The polyethylene fraction may then be recovered from the fractionation column by repeatedly displacing a solvent/non-solvent mixture into the column to dissolve the polyethylene fraction. The relative concentrations of the solvent and the non-solvent are based on a solvent gradient profile of the polyethylene parent polymer.

    摘要翻译： 可以制备聚合物级分例如聚乙烯级分，其具有小于约2.3的PDI和大于约1,000,000g / mol，3,000,000g / mol或6,000,000g / mol的M max。 通过首先将母体聚合物溶解在相对良好的溶剂中，将这样的聚乙烯部分与UHMWPE母体聚合物分离。 选择用于这种溶解的条件以降低母体聚合物的降解。 将所得的母体溶液输送到其中设置有支持物的分馏塔。 然后分馏塔在有效地在包含所需聚乙烯部分的载体上形成沉淀物的条件下操作。 然后可以通过将溶剂/非溶剂混合物重复置换到柱中以溶解聚乙烯部分，从分馏塔中回收聚乙烯部分。 溶剂和非溶剂的相对浓度基于聚乙烯母体聚合物的溶剂梯度分布。