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optical stack

A technology of optical laminates and cured layers, applied in optics, optical components, nonlinear optics, etc., can solve problems such as complicated production processes and achieve the effect of suppressing the degradation of polarization performance

Active Publication Date: 2022-06-28
SUMITOMO CHEM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when laminating the protective film and the polarizing plate through the water-based adhesive, in order to remove the moisture contained in the water-based adhesive to express the adhesive force, a drying process is required, and there is a problem that the production process becomes complicated.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0189] The surface of the protective film S was subjected to corona discharge treatment, and an active energy ray-curable resin composition (DENACOL EX-211: 95 parts by weight, CELLOXIDE 2021P: 5 parts by weight, photocationic polymerization initiator: 5.0 parts by weight, leveling agent: 0.20 parts by weight). Then, the polarizing plate surface of the polarizing plate with a protective film on one side is laminated on the active energy ray-curable resin composition layer. The cumulative light intensity from 280 nm to 320 nm was 200 mJ / cm from the protective film S side using an ultraviolet irradiation device with a conveyor belt [the lamp used was "Dbarbur" manufactured by Fusion UV Systems Co., Ltd.] 2 The active energy ray-curable resin composition is cured by irradiating ultraviolet rays. An adhesive layer was laminated on the TAC film bonded with an aqueous adhesive to produce a protective film S / cured layer of active energy ray-curable resin composition / polarizer / water-...

Embodiment 2

[0192] As an active energy ray-curable resin composition, an active energy ray-curable resin composition containing DENACOL EX-211: 85 parts by weight, CELLOXIDE 2021P: 15 parts by weight, a photocationic polymerization initiator: 5.0 parts by weight, and a leveling agent: 0.20 parts by weight was used An optical laminate was produced in the same manner as in Example 1, except for the type resin composition.

[0193] About the obtained optical laminated body, similarly to Example 1, the evaluation of wet heat durability, the measurement of the content ratio of iodine element, and the evaluation of adhesiveness were performed. The evaluation result of the adhesiveness was ○.

Embodiment 3

[0195] Except having used the protective film U as a protective film, it carried out similarly to Example 1, and produced the optical laminated body.

[0196] About the obtained optical laminated body, similarly to Example 1, the evaluation of wet heat durability, the measurement of the content ratio of iodine element, and the evaluation of adhesiveness were performed. The evaluation result of the adhesiveness was ○.

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Abstract

The present invention provides an optical laminate capable of suppressing a decrease in the polarization performance of a polarizing plate even in a hot and humid environment. An optical laminate, characterized in that at least one surface of a polarizer in which iodine is oriented on a polyvinyl alcohol-based resin is provided with a cured layer of a curable resin composition, and the optical laminate is heated at a temperature of 60° C. and a humidity of After being left in a 90% environment for 500 hours, the iodine content of the cured layer is 0.03 atomic % or less.

Description

technical field [0001] The present invention relates to an optical laminate. Background technique [0002] Liquid crystal display devices take full advantage of the characteristics of low power consumption, low voltage operation, light weight, and thinness, and have been used in various display devices. A liquid crystal panel constituting a liquid crystal display device has a structure in which a pair of polarizing plates are stacked on both surfaces of a liquid crystal cell. [0003] Conventionally, polarizing plates in which protective films are laminated on both surfaces of a polarizer made of a polyvinyl alcohol-based resin have been used as polarizing plates, and water-based adhesives such as polyvinyl alcohol-based adhesives have been widely used for laminating protective films. Adjuvant. However, when the protective film and the polarizer are laminated with the water-based adhesive interposed therebetween, in order to remove the water contained in the water-based ad...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02B5/30G02B1/14G02F1/1335
CPCG02F1/133528G02B1/14G02B5/305B32B27/08G02B5/3083B32B27/306B32B27/18B32B27/38B32B7/12B32B2307/42B32B2457/206B32B2038/0076B32B2307/514
Inventor 伊藤惠启永安智宇田幸弘
Owner SUMITOMO CHEM CO LTD