Preparation of polyethylene
    1.
    发明授权
    Preparation of polyethylene 失效
    聚乙烯的制备

    公开(公告)号:US06727331B2

    公开(公告)日:2004-04-27

    申请号:US10041002

    申请日:2001-12-28

    IPC分类号: C08F452

    摘要: A polyethylene having improved rheological properties is disclosed. The polyethylene has a melt index (MI2) from about 0.01 dg/min to about 50 dg/min and a melt strength (&eegr;) that satisfies MI2×&eegr;≧3.5. A process for making the polyethylene is also disclosed. The process uses an azaborolinyl-containing single-site catalyst in the presence of hydrogen, where the hydrogen consumption is controlled to be less than 30%.

    摘要翻译: 公开了具有改善的流变特性的聚乙烯。 聚乙烯具有约0.01dg / min至约50dg / min的熔体指数(MI2)和满足MI2xeta = 3.5的熔体强度(η)。 还公开了制备聚乙烯的方法。 该方法在氢气存在下使用含有氮杂硼烷的单中心催化剂,其中氢消耗被控制在小于30%。

    Ethylene polymerization process
    5.
    发明申请
    Ethylene polymerization process 有权
    乙烯聚合工艺

    公开(公告)号:US20080132640A1

    公开(公告)日:2008-06-05

    申请号:US11606752

    申请日:2006-11-30

    IPC分类号: C08F297/08

    摘要: A process for polymerizing ethylene is disclosed. The polymerization is performed in the presence of a Ziegler-Natta catalyst system in two slurry reaction zones. Most of the polyethylene (70-95 wt. %) is produced in one of the zones, while a smaller fraction is produced in the other zone. The ratio of the weight average molecular weight of the smaller fraction to that of the larger fraction is greater than 8:1. The resulting polyethylene blend, which should have both high melt strength and high extrudate swell, will be useful for blow-molding applications.

    摘要翻译: 公开了一种聚合乙烯的方法。 聚合在齐格勒 - 纳塔催化剂体系存在下在两个浆料反应区中进行。 大部分聚乙烯(70-95重量%)是在其中一个区域中生产的,而另一个区域则产生较小的部分。 较小部分的重均分子量与较大部分的重均分子量之比大于8:1。 所得到的聚乙烯共混物,其应具有高熔体强度和高挤出物膨胀性,可用于吹塑应用。

    Propylene polymer composites having improved melt strength
    9.
    发明授权
    Propylene polymer composites having improved melt strength 失效
    具有改善熔体强度的丙烯聚合物复合材料

    公开(公告)号:US06583209B2

    公开(公告)日:2003-06-24

    申请号:US09947836

    申请日:2001-09-06

    IPC分类号: C08L334

    摘要: Propylene polymer composites containing modified clays and compatibilizing agents, more specifically hydrogenated tallow modified montmorillonite and maleic anhydride grafted propylene polymers, are provided. Concentrates or masterbatches used to prepare the composites are also described. The improved composites of the invention exhibit increased melt strength compared to the base resin and to composites similarly formulated using other types of modified clays. Moreover, the improved results are achievable at lower compatibilizer levels and lower ratios of compatibilizer to clay than has heretofore been considered practical.

    摘要翻译: 提供了含有改性粘土和增容剂的丙烯聚合物复合材料,更具体地说是氢化牛脂改性蒙脱石和马来酸酐接枝丙烯聚合物。 还描述了用于制备复合材料的浓缩物或母料。 与基础树脂相比,本发明的改进的复合材料显示增加的熔体强度,并且与使用其它类型的改性粘土类似地配制的复合材料显示出增加的熔体强度。 此外,改善的结果可以在相对于较低的增容剂水平和相对于粘土的比例比以前被认为是实用的情况下是可实现的。

    High clarity polyethylene films
    10.
    发明授权
    High clarity polyethylene films 有权
    高透明聚乙烯薄膜

    公开(公告)号:US09029478B2

    公开(公告)日:2015-05-12

    申请号:US13022268

    申请日:2011-02-07

    申请人: Harilaos Mavridis

    发明人: Harilaos Mavridis

    IPC分类号: C08L23/04 C08L23/08 C08J5/18

    摘要: A film comprising a polymer blend of: (a) 0.15 to 0.8 wt % of an LDPE having an MI of 0.1 to 0.6 dg/min; and (b) 99.2 to 99.85 wt % of an LLDPE produced with a single-site catalyst comprising a metallocene and having a haze (HZlldpe), dart impact (DIlldpe), MD-Tear (MDTlldpe), and a slice long chain branching index of at least 0.90 for any portion of the composition having a molecular weight of 100,000 or above, wherein the film has a haze (HZblend), a dart impact (DIblend), and an MD-Tear (MDTblend), and HZblend=a*HZlldpe, where a is 0.20 to 0.70; DIblend=b*DIlldpe, where b is 0.9 to 1.3; and MDTblend=c*MDTlldpe, where c is 0.8 to 1.1.

    摘要翻译: 一种膜,其包含:(a)0.15至0.8重量%的MI为0.1至0.6dg / min的LDPE的聚合物共混物; 和(b)99.2〜99.85重量%的由包含茂金属并具有雾度(HZlldpe),飞镖撞击(DIlldpe),MD-撕裂(MDTlldpe))和切片长链支化指数的单中心催化剂制备的LLDPE 对于具有100,000或更高分子量的组合物的任何部分,至少为0.90,其中该膜具有雾度(HZblend),飞镖冲击(DIblend)和MD-撕裂(MDTblend),HZblend = a * HZlldpe,其中a为0.20至0.70; DIblend = b * DIlldpe,其中b为0.9至1.3; 和MDTblend = c * MDTlldpe,其中c为0.8至1.1。