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    • 9. 发明授权
    • High clarity, high stiffness films
    • 高透明度,高刚性膜
    • US08092920B2
    • 2012-01-10
    • US10527142
    • 2003-08-14
    • Jose V. SaavedraRajen PatelVarun Ratta
    • Jose V. SaavedraRajen PatelVarun Ratta
    • B32B27/08
    • B32B7/02B29C47/0026B29C47/06B29K2009/06B29K2023/0625B29K2023/0633B29K2023/065B29K2023/083B29K2023/12B29K2025/00B29K2105/256B29L2009/00B32B27/32Y10S428/91Y10T428/31909Y10T428/31913Y10T428/31917
    • A multi-layer heat film having at least three layers is disclosed wherein the film has high optical properties, high stiffness and desirable shrinkage in the cross direction. The inner layer, or layers, comprises at least one stiffening polymer selected from the group consisting of: low density polyethylene, linear low density polyethylene, high density polyethylene, blends thereof, polypropylene random copolymer, styrene/butadiene copolymer, polystyrene/butadiene copolymer, polystyrene, ethylene-vinyl acetate copolymer and cyclic-olefin copolymer, provided that when more than one inner layer is present, the inner layers can be the same or different. The skin layers, which may be the same or different, comprise at least one of: low density polyethylene; a blend of low density polyethylene and linear low density polyethylene; a blend of low density polyethylene and very low density polyethylene; polystyrene; ethylene-vinyl acetate copolymer; a blend of ethylene-vinyl acetate copolymer and linear low density polyethylene; cyclic-olefin copolymer; styrene-butadiene copolymer; or, polypropylene random copolymer, provided that the skin layers are devoid of a homogeneously branched polyethylene resin prepared with a single site catalyst. The inventive films have haze values of less than about 15%, a 2% secant modulus renter than about 50,000 psi and a cross directional shrinkage greater than 0%. The inventive films are made by a process that does not include post-extrusion bi-axial orientation.
    • 公开了具有至少三层的多层热膜,其中所述膜具有高光学性能,高刚度和在横向方向上期望的收缩。 内层或多层包含至少一种选自低密度聚乙烯,线性低密度聚乙烯,高密度聚乙烯,其共混物,聚丙烯无规共聚物,苯乙烯/丁二烯共聚物,聚苯乙烯/丁二烯共聚物, 聚苯乙烯,乙烯 - 乙酸乙烯酯共聚物和环烯烃共聚物,条件是当存在多于一个内层时,内层可以相同或不同。 皮肤层可以相同或不同,包括以下至少一种:低密度聚乙烯; 低密度聚乙烯和线性低密度聚乙烯的混合物; 低密度聚乙烯和极低密度聚乙烯的共混物; 聚苯乙烯 乙烯 - 乙酸乙烯酯共聚物; 乙烯 - 乙酸乙烯酯共聚物和线性低密度聚乙烯的共混物; 环烯烃共聚物; 苯乙烯 - 丁二烯共聚物; 或者,聚丙烯无规共聚物,条件是表皮层没有均匀分支的用单中心催化剂制备的聚乙烯树脂。 本发明的薄膜具有小于约15%的雾度值,大于约50,000psi的2%割线模量,并且横向收缩率大于0%。 本发明的薄膜通过不包括挤出后双向取向的方法制成。