FILM
    3.
    发明申请
    FILM 审中-公开
    电影

    公开(公告)号:US20100304062A1

    公开(公告)日:2010-12-02

    申请号:US12517908

    申请日:2007-12-19

    摘要: The present invention provides a uniaxially oriented multilayer film comprising at least (i) a layer (A) and (ii) a layer (B), wherein said layer (A) comprises a linear low density polyethylene (LLDPE) comprising (e.g. selected from):—a multimodal LLDPE produced using a Ziegler Natta catalyst (znLLDPE), or—a LLDPE produced using a single site catalyst (mLLDPE) or—a mixture of a mLLDPE and a multimodal znLLDPE, said layer (B) comprises a multimodal LLDPE, and said multilayer film is in the form of a stretched film which is uniaxially oriented in the machine direction (MD) in a draw ratio of at least 1:3.

    摘要翻译: 本发明提供了至少包含(i)层(A)和(ii)层(B)的单轴取向多层膜,其中所述层(A)包含线性低密度聚乙烯(LLDPE),其包含(例如, ): - 使用齐格勒纳塔催化剂(znLLDPE)产生的多峰LLDPE或使用单中心催化剂(mLLDPE)生产的LLDPE或者mLLDPE和多峰znLLDPE的混合物,所述层(B)包含多峰LLDPE 并且所述多层膜呈拉伸膜的形式,其以纵向方向(MD)以至少1:3的拉伸比单轴取向。

    Polymer composition, a process for the production thereof and films prepared thereof
    5.
    发明授权
    Polymer composition, a process for the production thereof and films prepared thereof 有权
    聚合物组合物,其制备方法和其制备的膜

    公开(公告)号:US06632884B1

    公开(公告)日:2003-10-14

    申请号:US09857901

    申请日:2001-10-01

    IPC分类号: C08F2002

    摘要: This invention concerns process for producing polyethylene compositions, films prepared thereof and process for the preparation of the films. The process comprises subjecting ethylene, optionally hydrogen and comonomers to polymerization or copolymerization reactions in a multistage polymerization. At least one polymerization stage is conducted essentially in the absence of hydrogen. The polymerization reactions are carried out in the presence of a single-site catalyst capable of forming a composition comprising a low molecular weight component with MFR2 of at least 10 g/10 min and a density higher than the density of the composition and a high molecular weight component. The melt flow rate of the composition is in the range MFR2=0.1-5.0 g/10 min and the density of the composition is 915-960 kg/m3. The invention makes it possible to produce polyethylene compositions for manufacturing films with a good balance between optical and mechanical properties.

    摘要翻译: 本发明涉及生产聚乙烯组合物的方法,其制备的薄膜及其制备方法。 该方法包括使乙烯,任选的氢和共聚单体在多级聚合中进行聚合或共聚反应。 基本上在不存在氢的情况下进行至少一个聚合阶段。 聚合反应在能够形成包含至少10g / 10分钟的MFR低于2分子量组分的组合物的单中心催化剂的存在下进行 并且密度高于组合物的密度和高分子量组分。 组合物的熔体流动速率在MFR 2 = 0.1-5.0g / 10min的范围内,组合物的密度为915-960kg / m 2 <3 。 本发明使得可以生产用于制造具有光学和机械性能之间良好平衡的膜的聚乙烯组合物

    Process for the production of linear low-density polyethylene composition
    9.
    发明授权
    Process for the production of linear low-density polyethylene composition 失效
    线性低密度聚乙烯组合物的生产工艺

    公开(公告)号:US07576166B2

    公开(公告)日:2009-08-18

    申请号:US10519326

    申请日:2003-06-19

    IPC分类号: C08L23/04 C08F297/08 C08J5/18

    摘要: A process for producing bimodal linear low-density polyethylene polymer compositions, useful for making films. The polymer compositions have a melt flow rate MFR2 of 0.4 to 1.0 g/10 min and a density of 918 to 925 kn/m3. The process to produce the polymer compositions involves copolymerizing ethylene with an alpha-olefin comonomer in a loop reactor to produce a low molecular weight polymer having a melt flow rate MFR2 of 50 to 500 g/10 min and a density of 945 to 953 kg/m3. The polymerization is continued in a gas phase reactor to produce a high molecular weight polymer, such that the final polymer composition has the desired properties. The final composition contains from 41 to 48% by weight of the low molecular weight polymer and from 59 to 52% by weight of the high molecular weight polymer. The resulting films have an excellent visual appearance and good mechanical properties. The compositions can easily be converted to films. The process can be operated a long time without a shutdown.

    摘要翻译: 一种生产用于制备薄膜的双峰线性低密度聚乙烯聚合物组合物的方法。 聚合物组合物的熔体流动速率MFR 2为0.4至1.0g / 10min,密度为918至925kn / m3。 制备聚合物组合物的方法包括在环管反应器中将乙烯与α-烯烃共聚单体共聚以产生熔体流动速率MFR 2为50至500g / 10min,密度为945至953kg / 10min的低分子量聚合物, m3。 在气相反应器中继续聚合以产生高分子量聚合物,使得最终的聚合物组合物具有所需的性能。 最终组合物含有41至48重量%的低分子量聚合物和59至52重量%的高分子量聚合物。 所得膜具有优异的视觉外观和良好的机械性能。 组合物可以容易地转化成薄膜。 该过程可以长时间运行,无需关机。

    Process to produce a homogeneous polyethylene material
    10.
    发明授权
    Process to produce a homogeneous polyethylene material 失效
    生产均质聚乙烯材料的方法

    公开(公告)号:US06642323B1

    公开(公告)日:2003-11-04

    申请号:US09674912

    申请日:2000-11-08

    IPC分类号: C08F234

    摘要: The present invention concerns a process for producing homogeneous polyethylene compositions and processes for making high density, medium density and low density films therefrom. The process comprises carrying out the polymerization in the presence of an ethylene-polymerizing catalyst system in a multistage reaction sequence of successive polymerization stages, at least one of which is a loop polymerization stage, and at least one of which is a gas phase polymerization stage. According to the invention, said loop polymerization stage is operated using a diluent selected from the group of linear and branched C4-C6 hydrocarbons and/or mixtures thereof. The reactor sequence is operated with different amounts of hydrogen and comonomers to produce a high molecular weight portion in one of the polymerization stages and a low molecular weight portion in another, so as to provide bimodal polyethylene composition with a low molecular weight part having an MFR2 of 250 g/10 min or more. The obtained material is homogenous and the fines level in the process is low.

    摘要翻译: 本发明涉及用于制备均匀的聚乙烯组合物的方法和从其制备高密度,中密度和低密度的薄膜的方法。 该方法包括在乙烯聚合催化剂体系的存在下,在连续聚合阶段的多阶段反应顺序中进行聚合,其中至少一个是环聚合阶段,并且其中至少一个是气相聚合反应阶段 。 根据本发明,所述环路聚合阶段使用选自直链​​和支链C 4 -C 6烃和/或其混合物的稀释剂进行操作。 反应器序列用不同量的氢和共聚单体操作以在聚合阶段之一和另一个聚合阶段中的低分子量部分产生高分子量部分,以便提供具有MFR 2的低分子量部分的双峰聚乙烯组合物 为250g / 10min以上。 获得的材料是均匀的,并且该方法中的细粉水平低。