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Optical film, production method thereof, polarizer, and image display device

A technology of optical film and manufacturing method, which is applied in the direction of chemical instruments and methods, optics, optical components, etc., can solve problems such as unevenness and display characteristic decline, and achieve the effects of excellent adhesion, no adhesion, and no optical defects

Active Publication Date: 2020-07-24
NITTO DENKO CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the polarizing plate provided with the protective film for the polarizer disclosed in Patent Document 1, the following problem was newly discovered: when exposed to a high humidity environment for a long time, optical defects such as stripe-like unevenness may occur, resulting in a decrease in display characteristics.

Method used

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  • Optical film, production method thereof, polarizer, and image display device
  • Optical film, production method thereof, polarizer, and image display device
  • Optical film, production method thereof, polarizer, and image display device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0135] An optical film was produced using a film manufacturing apparatus equipped with a melt extrusion film forming apparatus, a gravure coater, a tenter type simultaneous biaxial stretching apparatus, and a take-up apparatus. As the acrylic resin, pellets of the same imidized MS resin (glass transition temperature: 120° C.) used in the production of “transparent protective film 1A” described in JP-A-2017-26939 Example were used. material. The acrylic resin was melt-extruded from a T die to form a film with a thickness of 160 μm, and the above-mentioned composition was coated on one side of the film with a wet thickness of about 9 μm by a gravure coater. The biaxial stretching tenter was stretched to 2 times in the longitudinal direction (MD) and the width direction (TD), respectively, to obtain an optical film having an easy-slip layer with a thickness of 50 nm on one side of an acrylic film with a thickness of 40 μm.

Embodiment 2～4 and comparative example 1、2

[0137] An optical film was obtained in the same manner as in Example 1 except that the coating thickness of the composition for forming an easily slippery layer was changed. The thickness (after stretching) of the slippery layer is shown in Table 2.

Embodiment 5、6 and comparative example 3～5

[0139] The furnace temperature (stretching temperature) at the time of tenter stretching was changed as shown in Table 2. An optical film was obtained in the same manner as in Example 1 except that the stretching temperature was changed.

[0140] [Production of polarizing plate]

[0141] (production of polarizer)

[0142] A long roll of a polyvinyl alcohol (PVA)-based resin film ("PE4500" manufactured by Kuraray Co., Ltd.) with a thickness of 45 μm was stretched unidirectionally in the longitudinal direction by a roll stretching machine so that it was 5.9 times the longitudinal direction. Transported in the order of the swelling bath, dyeing bath, crosslinking bath 1, crosslinking bath 2, and cleaning bath shown in Table 1, dried at 70° C. for 5 minutes, and produced a polarizer with a thickness of 18 μm. The iodine concentration and the potassium iodide concentration in the dyeing bath were adjusted so that the single sheet transmittance of the polarizer became 43.4%.

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Abstract

An optical film (1) is provided with a slippery layer (15) on the surface of a transparent film substrate (11). The slippery layer (15) contains a binder resin and fine particles. The alkali componentcontent of the slippery layer (15) is 5-75 ppm. The slippery layer can be formed by applying a composition for forming the slippery layer which contains the binder resin or a precursor thereof, the fine particles, the alkali component, and a solvent onto the transparent film substrate, and heating the substrate. The optical film can be used as a polarizer protective film.

Description

technical field [0001] The present invention relates to an optical film provided with a slippery layer on the surface of a transparent film substrate and a method for producing the same. Furthermore, the present invention relates to a polarizing plate in which an optical film including a slippery layer is bonded to a surface of a polarizing member, and an image display device including the polarizing plate. Background technique [0002] Liquid crystal display devices and organic EL display devices are widely used as various image display devices such as mobile devices, car navigation devices, monitors for personal computers, and televisions. In view of its display principle, a liquid crystal display device has a polarizing plate disposed on the surface of a liquid crystal cell on a viewing side. In a transmissive liquid crystal display device, polarizing plates are arranged on both surfaces of a liquid crystal cell. In an organic EL display device, in order to prevent exte...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J7/04C08L33/04G02B5/30
CPCG02B5/305C08J7/0427B32B27/308B32B7/12C08J2333/00C08J2475/04B32B27/306B32B27/08B32B27/36B32B27/365B32B27/28B32B27/325B32B2255/10B32B2255/26B32B2307/42B32B2307/7265B32B2457/20B32B7/023C09D175/04G02B1/14G02B5/3033G02F1/133528B29D11/00865B29D11/00788C09J7/00C09J201/00C09J2301/312C09J2301/416C09J2203/318H10K59/50
Inventor 品川雅道下空冈田康彰徐菁璠
Owner NITTO DENKO CORP
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