利索-全球专利检索

  1. 登录
  2. 注册

搜索结果

31 条记录 (耗时 0.028 秒)

    Bimodal polyethylene resins that have high stiffness and high ESCR
    3.
    发明授权
    Bimodal polyethylene resins that have high stiffness and high ESCR 有权
    具有高刚度和高ESCR的双峰聚乙烯树脂

    公开(公告)号：US08138264B2

    公开(公告)日：2012-03-20

    申请号：US11744596

    申请日：2007-05-04

    申请人： Tim J. Coffy ,  Gerhard Guenther ,  Steven D. Gray

    发明人： Tim J. Coffy ,  Gerhard Guenther ,  Steven D. Gray

    IPC分类号： C08F4/642 ,  C08F210/16

    CPC分类号： C08F10/02 ,  C08F110/02 ,  C08F210/16 ,  C08F4/6555 ,  C08F2/001 ,  C08F2500/05 ,  C08F2500/13 ,  C08F2500/07 ,  C08F2500/11 ,  C08F2500/12 ,  C08F210/08

    摘要： A bimodal polyethylene having a high density ranging from about 0.955 to about 0.959 g/cc, an improved environmental stress cracking resistance (ESCR) of from about 400 to about 2500 hours, and an improved 0.4% flexural modulus of from about 180,000 to about 260,000 psi (1,200 MPa to about 1,800 MPa) may be formed using a Ziegler-Natta polymerization catalyst using two reactors in series. The bimodal polyethylene may have a high load melt index (HLMI) of from about 2 and about 30 dg/min and may be optionally made with a small amount of alpha-olefinic comonomer in the second reactor. It is emphasized that this abstract is provided to comply with the rules requiring an abstract which will allow a searcher or other reader to quickly ascertain the subject matter of the technical disclosure. It is submitted with the understanding that it will not be used to interpret or limit the scope or meaning of the claims.

    摘要翻译： 具有约0.955至约0.959g / cc的高密度的双峰聚乙烯，约400至约2500小时的改进的耐环境应力开裂性（ESCR）和约180,000至约260,000的改善的0.4％挠曲模量 可以使用串联的两个反应器的齐格勒 - 纳塔聚合催化剂形成psi（1200MPa至约1800MPa）。 双峰聚乙烯可以具有约2和约30dg / min的高负载熔体指数（HLMI），并且可以任选地在第二反应器中用少量的α-烯烃共聚单体制备。 要强调的是，该摘要被提供以符合要求摘要的规则，这将允许搜索者或其他读者快速确定技术公开的主题。 提交它的理解是，它不会用于解释或限制权利要求的范围或含义。

    Polymerization process providing polyethylene of enhanced optical properties
    5.
    发明申请
    Polymerization process providing polyethylene of enhanced optical properties 审中-公开
    提供增强光学性能的聚乙烯的聚合方法

    公开(公告)号：US20080269441A1

    公开(公告)日：2008-10-30

    申请号：US11796888

    申请日：2007-04-30

    申请人： Gerhard Guenther ,  David W. Knoeppel ,  Steven D. Gray ,  Tim J. Coffy

    发明人： Gerhard Guenther ,  David W. Knoeppel ,  Steven D. Gray ,  Tim J. Coffy

    IPC分类号： C08F4/44

    CPC分类号： C08F10/00 ,  C08F210/16 ,  C08F4/69 ,  C08F2/14 ,  C08F210/14 ,  C08F2500/12

    摘要： A process for the polymerization of ethylene to provide an ethylene polymer of reduced Yellowness Index. A feed stream, comprising an inert hydrocarbon diluent containing ethylene in a minor amount, is supplied to a polymerization reactor. A chromium-based polymerization catalyst and a triethylboron co-catalyst are incorporated into the feed stream within the reactor. The polymerization catalyst will normally be used in an amount within the range of 0.008-0.1 wt. % of the diluent in the feed stream and the triethylboron co-catalyst is incorporated in an amount within the range of 0.1-50 ppm of the diluent. The polymer fluff from the reactor is heated to a temperature sufficient to melt the fluff which is then extruded to produce a polymer product. The Yellowness Index after high temperature aging is at least 5% less than the corresponding Yellowness Index of a corresponding polymer product produced without the triethylboron co-catalyst.

    摘要翻译： 一种聚合乙烯以提供降低黄度指数的乙烯聚合物的方法。 将包含少量乙烯的惰性烃稀释剂的进料流供给到聚合反应器中。 在反应器内的进料流中加入铬基聚合催化剂和三乙基硼助催化剂。 聚合催化剂通常的用量范围为0.008-0.1wt。 进料流和三乙基硼助催化剂中稀释剂的％的掺入量在稀释剂的0.1-50ppm的范围内。 将来自反应器的聚合物绒毛加热到足以熔化绒毛的温度，然后将其挤出以产生聚合物产物。 高温老化后的黄度指数比没有三乙基硼助催化剂生产的相应的聚合物产物的相应黄度指数小至少5％。

    Cross-Linked Polyethylene Resin for Large Part Blow Molding
    6.
    发明申请
    Cross-Linked Polyethylene Resin for Large Part Blow Molding 审中-公开
    用于大型吹塑成型的交联聚乙烯树脂

    公开(公告)号：US20080161526A1

    公开(公告)日：2008-07-03

    申请号：US11966151

    申请日：2007-12-28

    申请人： Gerhard Guenther ,  Lea Ann Nairn ,  Curtis D. Clark

    发明人： Gerhard Guenther ,  Lea Ann Nairn ,  Curtis D. Clark

    IPC分类号： C08F110/02

    CPC分类号： C08F10/02 ,  C08F8/00 ,  C08F110/02 ,  C08F210/16 ,  C08F2810/10 ,  C08F2810/20 ,  C08F2500/07 ,  C08F2500/12 ,  C08F2500/13 ,  C08F2500/05 ,  C08F2500/21

    摘要： The invention relates generally to the production of polyethylene, and particularly to the production of polyethylene that is mixed with peroxides during extrusion to increase the level of long-chain branching. In an aspect, the polyethylene is used for large part blow molding (LPBM) applications. In an embodiment, the cross-linked polyethylene has a density of from about 0.945 g/cc to about 0.965 g/cc, a molecular weight distribution (MWD) of at least from 10 to 25, for example, and a high load melt index (HLMI) (ASTM D1238 21.6 kg) of from about 1 dg/min to about 30 dg/min. In an embodiment, the cross-linked polyethylene is comprised of at least one olefin having an ESCR of 100 hours to 1000 hours, and a flexural modulus of 120,000 psi to 250,000 psi.

    摘要翻译： 本发明一般涉及聚乙烯的生产，特别涉及在挤出过程中与过氧化物混合以提高长链支化水平的聚乙烯的生产。 在一方面，聚乙烯用于大型吹塑（LPBM）应用。 在一个实施方案中，交联聚乙烯具有约0.945g / cc至约0.965g / cc的密度，例如至少10至25的分子量分布（MWD）和高负载熔体指数 （HLMI）（ASTM D1238 21.6kg）为约1dg / min至约30dg / min。 在一个实施方案中，交联聚乙烯由至少一种具有100小时至1000小时的ESCR的烯烃和120,000psi至250,000psi的挠曲模量组成。