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    • 10. 发明授权
    • Biaxially drawn multilayer laminated film and method for producing the same
    • 双轴拉伸多层叠膜及其制造方法
    • US08053062B2
    • 2011-11-08
    • US12709069
    • 2010-02-19
    • Taro Oya
    • Taro Oya
    • B32B7/02
    • B32B27/08B32B7/02B32B27/36B32B2250/244B32B2307/518B32B2367/00G02B1/111G02B1/115Y10S428/91Y10T428/24942Y10T428/2495Y10T428/269Y10T428/31504Y10T428/31786Y10T428/31794Y10T428/31797
    • A film composed of a number of layers having different refractive indices and alternately laminated one upon another has characteristic optical properties by light interference. Conventional films having such structure have problems of poor interlaminar adhesivity and low tear strength. The problems are solved by a film having the following constitution. A biaxially drawn multilayer laminated film is composed of alternately laminated 1st layers and 2nd layers at a total layer number of 11 or more. Each layer has a thickness of 0.05 to 0.5 μm. The 1st layer is made of a crystalline thermoplastic resin and the 2nd layer is made of a crystalline thermoplastic resin having a composition different from that of the resin constituting the 1st layer. The maximum light reflectance of the film within the wavelength range of 350 to 2,000 nm is higher than the base line reflectance obtained from a light reflectance curve within the wavelength range of 350 to 2,000 nm by 20% or more.
    • 由多个折射率不同的层组成并且彼此层叠的膜由光干涉而具有特征的光学特性。 具有这种结构的常规膜具有差的层间粘合性和低撕裂强度的问题。 这些问题由具有以下结构的膜解决。 双轴拉伸多层层叠膜由层叠数为11以上的交替层叠的第1层和第2层构成。 各层的厚度为0.05〜0.5μm。 第一层由结晶热塑性树脂制成,第二层由与构成第一层的树脂的组成不同的结晶热塑性树脂制成。 在350〜2000nm的波长范围内的膜的最大光反射率高于在350〜2000nm的波长范围内的光反射率曲线20%以上得到的基线反射率。