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29 条记录 (耗时 0.023 秒)

    Measurement and preparation of branched vinyl polymers
    12.
    发明授权
    Measurement and preparation of branched vinyl polymers 失效
    支链乙烯基聚合物的测量和制备

    公开(公告)号：US07514516B2

    公开(公告)日：2009-04-07

    申请号：US11208909

    申请日：2005-08-22

    申请人： Brad Stiles ,  Jose M. Sosa ,  Cyril Chevillard ,  Aron Griffith ,  Jay L. Reimers

    发明人： Brad Stiles ,  Jose M. Sosa ,  Cyril Chevillard ,  Aron Griffith ,  Jay L. Reimers

    IPC分类号： C08F212/34 ,  C08F212/36 ,  C08F2/38 ,  G01N30/84

    CPC分类号： C08F2/00 ,  C08F112/08 ,  C08F279/02 ,  C08F2400/02 ,  C08L25/06 ,  C08L2205/02 ,  C08L2666/04 ,  C08F212/08

    摘要： Disclosed are novel non-linear vinyl polymers comprised of a multifunctional peroxide, and a cross-linking agent and/or a chain transfer agent, and methods of making such polymers having: at least 0.03 branches/1000 backbone carbons; linear portions with a molecular weight (Mw) of 350,000 or less; 0.2 to 3.0 branches/molecule; or, a Mz/Mw of from 1.7 to 5.7. Methods of quantifying branching are disclosed using a linear reference having 0.0 to 0.06 branches/1000 backbone carbons along with SEC techniques and measurements of molecular weight, molecular size, and concentration. Also discovered is a vinyl polymer resin comprised of from 0.1 to 50 weight percent of non-linear polymers having at least 0.06 branches/1000 backbone carbons, where branching is measured using a heat polymerized polystyrene having from 0.0 to 0.06 branches/1000 backbone carbons as a linear reference.

    摘要翻译： 公开了由多官能过氧化物，交联剂和/或链转移剂组成的新型非线性乙烯基聚合物，以及制备这种聚合物的方法，其具有：至少0.03个支链/ 1000个骨架碳; 分子量（Mw）为350,000以下的线性部分; 0.2〜3.0支/分子; 或者为1.7至5.7的Mz / Mw。 使用具有0.0至0.06个支链/ 1000个骨架碳的线性参考文献以及SEC技术和分子量，分子大小和浓度的测量来公开定量分支的方法。 还发现了乙烯基聚合物树脂，其由0.1至50重量％的具有至少0.06个支链/ 1000个骨架碳的非线性聚合物组成，其中使用具有0.0至0.06个支链/ 1000个骨架碳的热聚合聚苯乙烯测量分支， 线性参考。

    POLYETHYLENE FILMS WITH IMPROVED BUBBLE STABILITY
    13.
    发明申请
    POLYETHYLENE FILMS WITH IMPROVED BUBBLE STABILITY 审中-公开
    具有改善泡沫稳定性的聚乙烯薄膜

    公开(公告)号：US20090035545A1

    公开(公告)日：2009-02-05

    申请号：US11830298

    申请日：2007-07-30

    申请人： Gerhard Guenther ,  Cyril Chevillard ,  Shannon Hoesing

    发明人： Gerhard Guenther ,  Cyril Chevillard ,  Shannon Hoesing

    IPC分类号： B32B25/08 ,  C08K5/14 ,  C08L23/06

    CPC分类号： C08J5/18 ,  B32B27/06 ,  B32B27/32 ,  B32B2439/70 ,  C08F8/00 ,  C08F110/02 ,  C08F2810/10 ,  C08J2323/06 ,  C08J2323/26 ,  C08K5/14 ,  C08L23/06 ,  Y10T428/263 ,  C08F2500/07 ,  C08F2500/26 ,  C08F2500/12

    摘要： This invention relates to high density polyethylene blown films having good barrier properties and improved processing characteristics. The method incorporates the use of peroxide which results in improved bubble stability without sacrifice in barrier properties. The polyethylenes have a density greater than about 0.950 g/cc, are relatively narrow in molecular weight distribution MWD (in the range of from about 2.0 to about 6.5), and are of medium molecular weight. In an embodiment, the films also have a rheological breadth parameter, a, that has been reduced by at least about 5%, but not more than 45%, by addition of a peroxide to the polyethylene. The addition of peroxide improves processability without sacrificing strength and barrier properties such as oxygen transmission rate.

    摘要翻译： 本发明涉及具有良好的阻隔性和改善的加工特性的高密度聚乙烯吹塑薄膜。 该方法包括使用过氧化物，其导致改善的气泡稳定性，而不牺牲阻隔性能。 聚乙烯具有大于约0.950g / cc的密度，分子量分布MWD相对较窄（在约2.0至约6.5的范围内），并且具有中等分子量。 在一个实施方案中，膜还具有通过向聚乙烯中加入过氧化物而减少至少约5％但不超过45％的流变宽度参数a。 加入过氧化物可以改善加工性能，而不会牺牲强度和阻隔性能如氧气透过率。

    Use of accelerators in free-radical polymerizations of styrene
    17.
    发明授权
    Use of accelerators in free-radical polymerizations of styrene 失效
    在苯乙烯的自由基聚合中使用促进剂

    公开(公告)号：US06770716B1

    公开(公告)日：2004-08-03

    申请号：US10379052

    申请日：2003-03-04

    申请人： Jose M. Sosa ,  Cyril Chevillard

    发明人： Jose M. Sosa ,  Cyril Chevillard

    IPC分类号： C08F27902

    CPC分类号： C08F12/04 ,  C08F4/06 ,  C08F236/10 ,  C08F279/02 ,  C08F4/32 ,  C08F212/00

    摘要： It has been discovered that certain compounds serve as polymerization accelerators when employed together with peroxide initiators for the polymerization of vinylaromatic monomers. Suitable accelerators that increase the rate of decomposition of the peroxide initiator include, but are not necessarily limited to, hydroperoxides and/or metallic salts. Representative examples of suitable hydroperoxide accelerators include t-butyl hydroperoxide (TBH), cumyl hydroperoxide, and p-isopropyl cumyl hydroperoxide, whereas suitable metallic salt accelerators include cobalt naphthenate and cobalt acetoacetonate. Use of these accelerators when vinylaromatic monomers are polymerized in the presence of polybutadienes and peroxide initiators results in an increase in grafting as compared with similar copolymers made without the accelerator.

    摘要翻译： 已经发现，当与过氧化物引发剂一起用于乙烯基芳族单体的聚合时，某些化合物用作聚合促进剂。 增加过氧化物引发剂分解速率的合适的促进剂包括但不限于氢过氧化物和/或金属盐。 合适的氢过氧化物加速剂的代表性实例包括叔丁基过氧化氢（TBH），枯基氢过氧化物和对异丙基异丙基氢过氧化物，而合适的金属盐促进剂包括环烷酸钴和乙酰丙酮酸钴。 当在聚丁二烯和过氧化物引发剂的存在下聚合乙烯基芳族单体时，使用这些促进剂导致与不使用促进剂的类似共聚物相比，接枝增加。