Polarizing plate
A polarizing plate and polarizing film technology, applied in the field of polarizing plates, can solve the problems of reduced durability and achieve excellent durability
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[0096] Hereinafter, although an Example demonstrates this invention concretely, this invention is not limited to a following Example. It should be noted that the measurement methods of each characteristic are as follows.
[0097]
[0098] Single sheet transmittance T, parallel transmittance Tp, and vertical transmittance Tc of the polarizing film were measured using an ultraviolet-visible spectrophotometer (V7100, manufactured by JASCO Corporation). T, Tp, and Tc are Y values obtained by performing relative spectral response correction on values measured with a 2-degree field of view (C light source) of JISZ8701. In order to facilitate the processing of the polarizing film, this measurement was carried out in a state where the transparent protective layer (acrylic resin film) was bonded to the polarizing film. Since the light absorption of the transparent protective layer is negligibly smaller than the light absorption of the polarizing film, the transmittance of the la...
manufacture example 1
[0107] [Manufacturing example 1] Manufacture of polarizing film
[0108] An amorphous-polyethylene terephthalate (A-PET) film (trade name "NOBAKURIASH046" manufactured by Mitsubishi Plastics, Inc., thickness: 200 μm) was prepared as a resin substrate, and corona was applied to the surface of the resin substrate. Treatment (58W / m 2 / min). On the other hand, modified PVA (manufactured by The Nippon Synthetic Chemical Industry Co., Ltd., trade name "GOHSEFIMERZ200", degree of polymerization: 1200, degree of saponification: 99.0% or more, degree of modification of acetoacetyl group: 4.6%) to which 1 wt% was added was added. ) PVA (polymerization degree: 4200, saponification degree: 99.2% or more), coated on the resin substrate so that the film thickness after drying becomes 12 μm, and dried by hot air drying at 60°C for 10 minute. Thereby, the laminated body in which the PVA-type resin layer was provided on the resin base material was manufactured.
[0109] First, the laminate...
manufacture example 2
[0115] [Manufacture Example 2] Manufacture of resin film for protective layer formation
[0116] The methacrylic resin pellets having glutarimide ring units were dried at 100.5 kPa and 100° C. for 12 hours, and extruded from a T-die at a mold temperature of 270° C. by a single-screw extruder to form a film. In addition, the film was stretched in the conveying direction at a temperature 10° C. higher than the Tg of the resin, and then stretched in a direction perpendicular to the conveying direction of the film at a temperature 7° C. higher than the Tg of the resin. The resin film for protective layer formation which consists of an acrylic resin was obtained.
[0117] It should be noted that as the film, a protective layer-forming resin film I (moisture permeability: 160 g / m 2 / 24hr) and resin film II for protective layer formation with a thickness of 30 μm (moisture permeability: 120g / m 2 / 24hr).
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Abstract
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