Uniaxially stretched multi-layer laminate film, polarizing plate comprising same, optical member for liquid crystal display device, and liquid crystal display device
    45.
    发明授权
    Uniaxially stretched multi-layer laminate film, polarizing plate comprising same, optical member for liquid crystal display device, and liquid crystal display device 有权
    单轴拉伸多层层压膜,包含其的偏振片,液晶显示装置用光学构件和液晶显示装置

    公开(公告)号:US09519090B2

    公开(公告)日:2016-12-13

    申请号:US14407324

    申请日:2013-09-20

    Applicant: TEIJIN LIMITED

    Abstract: A uniaxially stretched multi-layer laminate film that exhibits a high polarization performance of 99.5% or more in a simpler configuration than before, a polarizing plate that is composed of the same, an optical member for a liquid crystal display device, and a liquid crystal display device are provided. Namely, in the uniaxially stretched multi-layer laminate film in which a first layer and a second layer are alternately laminated, the uniaxially stretched multi-layer laminate film includes an intermediate layer that has a thickness of 2 μm or more and 30 μm or less; the first layer is composed of a polyester containing a naphthalene dicarboxylic acid ester; the second layer is composed of a copolymer polyester and is an optically isotropic layer that has an average refractive index of 1.50 or more and 1.60 or less; the first layer, the second layer, both first and second layers, or the intermediate layer contains a visible light absorbent, which has a weight loss of less than 10% when it is kept at 300° C. for 1 hour, in an amount of 200 ppm or more and 2500 ppm or less on the basis of the weight of the layer; the uniaxially stretched multi-layer laminate film has a polarization degree of 99.5 or more; and the average transmittance Ts for S-polarized light in a wavelength range of 400 nm to 800 nm is 60% or more.

    Abstract translation: 具有比以前更简单的构造具有99.5%以上的高偏振性能的单轴拉伸多层层压膜,由其组成的偏振片,液晶显示装置用光学构件和液晶 提供显示设备。 也就是说,在第一层和第二层交替层叠的单轴拉伸多层层压膜中,单轴拉伸多层层合膜包括厚度为2μm以上且30μm以下的中间层 ; 第一层由含有二羧酸酯的聚酯构成; 第二层由共聚物聚酯组成,是平均折射率为1.50以上且1.60以下的光学各向同性层; 第一层,第二层,第一层和第二层,或中间层含有可见光吸收剂,其在300℃下保持1小时时的重量损失小于10%,量为 基于该层的重量为200ppm以上且2500ppm以下的值; 单轴拉伸多层层压膜的偏振度为99.5以上; 在400nm至800nm的波长范围内的S偏振光的平均透射率Ts为60%以上。

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