Co-extruded, multilayer packaging film made from propylene polymer material
    2.
    发明授权
    Co-extruded, multilayer packaging film made from propylene polymer material 失效
    由丙烯聚合物材料制成的共挤出多层包装膜

    公开(公告)号:US06333096B1

    公开(公告)日:2001-12-25

    申请号:US09468438

    申请日:1999-12-21

    IPC分类号: B32B2732

    摘要: A co-extruded, multilayer film for packaging freshly cut produce consists of (1) an outer layer of an ethylene/propylene/4-8 C alpha-olefin terpolymer, (2) a middle layer containing at least one of (a) 0-100% of the terpolymer described in (1) and (b) 0-100% of a blend of (i) about 99.5% to about 95% of an olefin copolymer composition made by sequential polymerization in at least two stages and (ii) about 0.5% to about 5% of a low density polyethylene, wherein (a)+(b)=100%, and (3) an inner layer containing at least one of (a) 0-100% of a copolymer of ethylene and a C4-C8 alpha-olefin made using a metallocene catalyst and having a density of 0.89 to 0.91 g/cm3, and (b) 0-100% of blend (b) described in layer (2), wherein (a)+(b)=100%. The thickness ratios of the layers and, when both components are present, the amount of each polymer in the blends of layers (2) and (3) can be varied to match the gas transmission rate of the produce to be packaged.

    摘要翻译: 用于包装新鲜切割产品的共挤出多层膜包括(1)乙烯/丙烯/4-8Cα-烯烃三元共聚物的外层,(2)含有(a)0 (1)和(b)中描述的三元共聚物的-100%0-100%的(i)约99.5%至约95%的通过在至少两个阶段中顺序聚合制备的烯烃共聚物组合物的共混物(ii) )约0.5%至约5%的低密度聚乙烯,其中(a)+(b)= 100%,和(3)含有(a)0-100%的乙烯共聚物 和使用茂金属催化剂制备的密度为0.89〜0.91g / cm 3的C4-C8α-烯烃,和(b)层(2)中描述的0-100%的共混物(b),其中(a)+ (b)= 100%。 层的厚度比,并且当存在两种组分时,可以改变层(2)和(3)的共混物中的每种聚合物的量以与待包装的产品的气体传输速率相匹配。