| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a multilayer uniaxially oriented film having a reflective polarization function, in which the polarizing performance is further enhanced compared to a conventional film, shift in a hue of transmitted polarized light depending on an incident angle in an oblique direction is prevented for the light obliquely incident to the film, and excellent heat-resistant dimensional stability is obtained. <P>SOLUTION: The multilayer uniaxially oriented film comprises alternately laminated first layers and second layers in total 251 layers or more. The first layer is a layer comprising a polyester, which contains: (i) as a dicarboxylic acid component, a specified dicarboxylic acid component by 5 mol% or more and 50 mol% or less containing naphthoic acid component, and a dicarboxylic acid component having a naphthalene diyl group; and (ii) as a diol component, a diol component having a 2-4C alkylene group. The second layer is an optically isotropic layer having an average refractive index of 1.50 or more and 1.60 or less, comprising a copolymer polyester having a glass transition temperature of 80 or higher and a copolymerization amount of 5 mol% or more and 85 mol% or less. The multilayer uniaxially oriented film shows a thermal shrinkage of 1.5% or less at 85°C. <P>COPYRIGHT: (C)2013,JPO&INPIT |
