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    RETORTABLE EASY OPENING SEALS FOR FILM EXTRUSION
    1.
    发明申请
    RETORTABLE EASY OPENING SEALS FOR FILM EXTRUSION 审中-公开
    可折叠的轻松打开的密封圈用于电影挤出

    公开(公告)号：US20140377548A1

    公开(公告)日：2014-12-25

    申请号：US14364333

    申请日：2012-12-27

    申请人： Cyrille Billouard ,  Shaun Parkinson ,  Xiaosong Wu ,  John W. Garnett

    发明人： Cyrille Billouard ,  Shaun Parkinson ,  Xiaosong Wu ,  John W. Garnett

    IPC分类号： B32B7/06 ,  B32B27/32 ,  B32B27/08

    摘要： The multilayer film comprises a first outer layer which is heat sealable. The first outer layer comprises from 95 to 100 percent (by weight of the first outer layer) of a first polymer, said first polymer being derived from propylene monomer and optionally one or more comonomers selected from the group consisting of ethylene and C4-C8 alpha olefins. The first polymer should have a melting point of at least 125 C. The multilayer film further comprises an inner portion adjacent to the first outer layer. The inner portion may be a single layer or may comprise several layers. At least one layer of the inner portion comprises an elastomeric propylene based polymer (“EPBP”). Further at least one layer of the inner portion comprises a second polymer, wherein the second polymer is selected from the group consisting of high pressure low density polyethylene, high density polyethylene, ethylene acrylic acid copolymers, ethylene (meth)acrylic acid copolymers and combinations thereof. The second polymer may be together with the EPBP in the same layer or may be in a separate layer. It is also contemplated that the inner portion may optionally comprise one or more additional layers, which may or may not contain EPBP or the second polymer. The multilayer film further comprises a second outer layer arranged so that the inner portion is encapsulated between the first outer layer and the second outer layer. The second outer layer comprises a third polymer, wherein said third polymer is selected from the group consisting of homopolymer polypropylene, random copolymer polypropylene and impact copolymer polypropylene and blends thereof.

    摘要翻译： 多层膜包括可热封的第一外层。 第一外层包含95至100％（按第一外层的重量计）第一聚合物，所述第一聚合物衍生自丙烯单体和任选的一种或多种选自乙烯和C 4 -C 8α-烯烃的共聚单体 烯烃。 第一聚合物应具有至少125℃的熔点。多层膜还包括与第一外层相邻的内部部分。 内部可以是单层，或者可以包括几层。 至少一层内部部分包括弹性体丙烯基聚合物（“EPBP”）。 此外，内部部分的至少一层包括第二聚合物，其中第二聚合物选自高压低密度聚乙烯，高密度聚乙烯，乙烯丙烯酸共聚物，乙烯（甲基）丙烯酸共聚物及其组合 。 第二聚合物可以与EPBP一起在同一层中，或者可以在单独的层中。 还可以预期的是，内部部分可以任选地包括一个或多个另外的层，其可以含有或不包含EPBP或第二聚合物。 多层膜还包括第二外层，其布置成使得内部部分被封装在第一外层和第二外层之间。 第二外层包括第三聚合物，其中所述第三聚合物选自均聚聚丙烯，无规共聚物聚丙烯和抗冲共聚物聚丙烯及其共混物。