Optical film and optical laminate using same
An optical laminate and optical film technology, which is applied in the field of optical films, can solve the problems of increased light leakage from polarizing elements, decreased polarization degree, and reduced function of polarized sunglasses, and achieves the effect of maintaining metallic tone and suppressing the decrease in polarization degree.
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Embodiment 1
[0079]
[0080] Using the prepared coating liquids (R1) and (L1), a light reflection layer was produced in the following procedure, and then these were laminated to produce a laminate of the light reflection layer used in the present invention. As the plastic substrate, a PET film (without undercoat layer) manufactured by Toyobo Co., Ltd. was used.
[0081] (1) Each coating solution was coated on a PET film at room temperature using a wire bar so that the film thickness after drying was 4 μm.
[0082] (2) Heating at 150° C. for 5 minutes removes the solvent and forms a cholesteric liquid crystal phase. Next, a high-pressure mercury lamp (manufactured by Harison Toshiba Lighting Co., Ltd.) was output at 120 W, and UV was irradiated for 5 to 10 seconds to fix the cholesteric liquid crystal phase and obtain a light reflection layer.
[0083] (3) The light reflection layer side mutual of the light reflection layer (R1) and the light reflection layer (L1) produced in (1)-(2) wer...
Embodiment 2
[0095] Except having used the prepared coating liquid (R2), (L2), it carried out similarly to Example 1, and obtained the laminated body of the light reflection layer used for this invention. Both the central reflection wavelengths of the light reflection layer ( R2 ) and the light reflection layer ( L2 ) were 540 nm. Next, a polarizing element was laminated in the same manner as in Example 1 to obtain the optical film of the present invention. The polarization degree of this optical film was measured by the same operation as Example 1, and the polarization degree was 98.1%.
Embodiment 3
[0097] Except having used the prepared coating liquid (R3), (L3), it carried out similarly to Example 1, and obtained the laminated body of the light reflection layer used by this invention. The central reflection wavelengths of the light reflection layer ( R3 ) and the light reflection layer ( L3 ) were 650 nm and 630 nm, respectively. Next, a polarizing element was laminated in the same manner as in Example 1 to obtain the optical film of the present invention. The polarization degree of this optical film was measured by the same operation as Example 1, and the polarization degree was 98.3%.
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