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    • 11. 发明授权
    • Clear high molecular weight film
    • 清除高分子量薄膜
    • US5989725A
    • 1999-11-23
    • US785003
    • 1997-01-16
    • Edward M. BullardThomas A. White
    • Edward M. BullardThomas A. White
    • B32B27/32
    • B32B27/32Y10T428/31913
    • A polymeric multilayer film is disclosed that has improved optical qualities while having structural qualities that are not significantly compromised. The film is composed of outer film layers of a low polydispersity polymer which are placed around at least one inner film layer of a high molecular weight high density polyethylene (HDPE) polymer. The outer film layer polymer has a polydispersity of from about 1 to about 4. In a preferred embodiment this low polydispersity polymer is formed in the presence of a metallocene catalyst. The inner film layer high molecular weight HDPE polymer has a melt index of less than 0.1 and a density of at least about 0.940 g/cm.sup.3. Any of the layers of the film may be constructed of polymer blends.
    • 公开了一种聚合物多层膜,其具有改善的光学质量,同时具有不显着损害的结构质量。 该膜由低分散性聚合物的外膜层组成,其位于高分子量高密度聚乙烯(HDPE)聚合物的至少一个内膜层周围。 外层膜聚合物的多分散性为约1至约4.在优选的实施方案中,该低分多分散性聚合物是在金属茂催化剂存在下形成的。 内层膜高分子量HDPE聚合物的熔体指数小于0.1,密度至少约0.940g / cm3。 膜的任何层可以由聚合物共混物构成。