Process for the production of linear low-density polyethlene composition
    3.
    发明申请
    Process for the production of linear low-density polyethlene composition 失效
    生产线性低密度聚乙烯组合物的方法

    公开(公告)号:US20060167192A1

    公开(公告)日:2006-07-27

    申请号:US10519326

    申请日:2003-06-19

    IPC分类号: C08F2/00

    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 copolymerising 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 polymerisation 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 <2>为0.4至1.0g / 10min,密度为918至925kn / m 3。 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具有50至500g / 10min的熔体流动速率MFR 2/2的低分子量聚合物,以及 密度为945至953kg / m 3。 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质。 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。