Methods for producing polymers with control over composition distribution
    2.
    发明申请
    Methods for producing polymers with control over composition distribution 有权
    用于生产控制组分分布的聚合物的方法

    公开(公告)号:US20050282980A1

    公开(公告)日:2005-12-22

    申请号:US10872847

    申请日:2004-06-21

    IPC分类号: C08F4/44 C08F210/16

    摘要: Methods for controlling a melt viscosity of a polyolefin, controlling comonomer distribution of a polyolefin, achieving a targeted melt viscosity of a polyolefin, and films made from such polyolefins are provided. The methods include contacting an olefin monomer and at least one comonomer with a catalyst system in the presence of a condensable fluid comprising a saturated hydrocarbon having from 2 to 8 carbon atoms. The catalyst system in one embodiment includes a hafnium metallocene catalyst component.

    摘要翻译: 提供了控制聚烯烃的熔融粘度,控制聚烯烃的共聚单体分布,达到聚烯烃的目标熔体粘度和由这种聚烯烃制成的膜的方法。 所述方法包括使烯烃单体和至少一种共聚单体与催化剂体系在含有2-8个碳原子的饱和烃的可冷凝流体存在下接触。 催化剂体系在一个实施方案中包括铪茂金属催化剂组分。

    Ethylene-Alpha olefin copolymers and polymerization processes for making the same
    5.
    发明申请
    Ethylene-Alpha olefin copolymers and polymerization processes for making the same 有权
    乙烯-α烯烃共聚物和制备相同的聚合方法

    公开(公告)号:US20080021183A1

    公开(公告)日:2008-01-24

    申请号:US11821696

    申请日:2007-06-25

    IPC分类号: C08F210/00 C08F4/06

    摘要: A process for the production of an ethylene alpha-olefin copolymer is disclosed. The process includes polymerizing ethylene and at least one alpha-olefin by contacting the ethylene and the at least one alpha-olefin with a metallocene catalyst in at least one gas phase reactor at a reactor pressure of from 0.7 to 70 bar and a reactor temperature of from 20° C to 150° C to form an ethylene alpha-olefin copolymer. The resulting ethylene alpha-olefin copolymer may have a density of 0.927 g/cc or greater and environmental stress crack resistance (ESCR) of 500 hr or more when measured according to ASTM 1693/B in 10% Igepal.

    摘要翻译: 公开了一种生产乙烯α-烯烃共聚物的方法。 该方法包括通过在至少一个气相反应器中在0.7至70巴的反应器压力下将乙烯和至少一种α-烯烃与金属茂催化剂接触,使聚合乙烯和至少一种α-烯烃,反应器温度为 从20℃至150℃,以形成乙烯α-烯烃共聚物。 当根据ASTM 1693 / B在10%Igepal中测量时,所得乙烯α-烯烃共聚物的密度可以为0.927g / cc或更高,环境应力开裂抗性(ESCR)为500小时以上。

    Very low density polyethylene blends
    10.
    发明申请
    Very low density polyethylene blends 审中-公开
    极低密度聚乙烯共混物

    公开(公告)号:US20060276594A1

    公开(公告)日:2006-12-07

    申请号:US11504257

    申请日:2006-08-10

    IPC分类号: C08L23/04

    摘要: Blends of very low density polyethylene produced using metallocene catalysts (mVLDPE) and linear low density polyethylene (LLDPE) are disclosed. The polymer blends include a metallocene-catalyzed VLDPE polymer having a density of less than 0.916 g/cm3, the VLDPE polymer preferably being linear and without long chain branching, and a LLDPE polymer having a density of from 0.916 to 0.940 g/cm3. The polymer blends are particularly suitable in blown and cast film applications.

    摘要翻译: 公开了使用金属茂催化剂(mVLDPE)和线性低密度聚乙烯(LLDPE)生产的非常低密度聚乙烯的共混物。 聚合物共混物包括茂金属催化的密度小于0.916g / cm 3的VLDPE聚合物,VLDPE聚合物优选是线性的且不具有长链支化,并且具有密度为 0.916至0.940g / cm 3。 聚合物共混物特别适用于吹塑和流延膜应用。