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    • 10. 发明授权
    • Oriented multilayer film and process for making same
    • 定向多层膜及其制造方法
    • US5077109A
    • 1991-12-31
    • US498876
    • 1990-03-26
    • Stanley LustigStephen J. Vicik
    • Stanley LustigStephen J. Vicik
    • B32B27/34
    • B32B27/34Y10T428/1393Y10T428/2495Y10T428/31725Y10T428/31739
    • An oriented multilayer film comprising a barrier layer, a first layer on one side of said barrier layer and a second layer on the opposite side of said barrier layer is provided for use in food packaging applications. The first and second layers have melting points of at least about 115.degree. C. The barrier layer comprises amorphous nylon having a glass transition temperature greater than the higher of the two melting points or higher than the melting point of the first and second layers. The barrier layer is substantially impermeable to oxygen, while the first and second layers may comprise certain polyethylene resins. The oxygen barrier properties of the film do not deteriorate as the barrier layer gradually absorbs moisture. A process for making such multilayer films is also provided.
    • 提供了一种定向多层膜,其包括阻挡层,所述阻挡层一侧上的第一层和位于所述阻挡层相对侧上的第二层,用于食品包装应用中。 第一层和第二层具有至少约115℃的熔点。阻挡层包括玻璃化转变温度大于两个熔点中较高者或高于第一和第二层的熔点的无定形尼龙。 阻挡层基本上不透氧,而第一和第二层可以包含某些聚乙烯树脂。 当阻挡层逐渐吸收水分时,膜的氧阻隔性能不会劣化。 还提供了制造这种多层膜的方法。