Laminated body and liquid crystal display device
A laminated body and adhesive layer technology, applied to layered products, synthetic resin layered products, instruments, etc., can solve the problems of reduced visibility of display devices, LOCA liquid dripping to the side of the polarizer, etc. Excellent visibility
Active Publication Date: 2020-08-18
SUMITOMO CHEM CO LTD
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Problems solved by technology
[0003] However, when the LOCA is provided between the cover glass or the touch panel and the liquid crystal panel, the main surface of the protective film of the polarizer, which is one of the members constituting the outermost surface of the liquid crystal panel, may come into contact with the LOCA, or the When LOCA is a liquid and the LOCA liquid drips onto the side of the polarizer
In addition, it is also known that the main surface and the side surface of the polarizing plate are in contact with LOCA, and the adhesive component of LOCA causes solvent cracks to occur on the protective film constituting the surface of the polarizing plate, which may cause damage to the display device. Reduced vision
Method used
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[0154] Hereinafter, examples are given to illustrate the present invention, but the present invention is not limited by these examples.
[0155] [Calculation method of solubility parameter (SP value)]
[0156] The SP value of the cyclic olefin resin protective film was calculated by the Y-MB method of software called HSPiP.
[0157] [Manufacturing of Active Energy Ray Curable Adhesive Composition]
[0158] As described in Table 2 below, polymerizable monomers were mixed to obtain compositions 1-12. The solubility S of the polymerizable monomer contained in each composition was obtained by the following formula, and it was combined and described in Table 2.
[0159]
[0160] S k Represents the solubility of the k-th polymerizable monomer contained in the active energy ray-curable adhesive composition forming the active energy ray-curable adhesive layer in 100 g of water at 25°C, a k It represents the weight part of the k-th polymerizable monomer contained in an active energy ray-curable...
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Abstract
The present invention relates to a laminate and a liquid crystal display device. The present invention provides a laminate in which solvent cracks do not occur in a protective film constituting a polarizing plate, and further provides a liquid crystal display device incorporating the laminate and having excellent visibility. The laminated body of the present invention has a substrate, an active energy ray-curable adhesive layer, and a polarizing plate in this order, wherein the polarizing plate is a polarizing plate having a polarizer and a cyclic olefin-based resin protective film, and the laminated body satisfies The following formula. S represents the solubility in 100 g of water at 25° C. of the polymerizable monomer contained in the active energy ray-curable adhesive composition forming the active energy ray-curable adhesive layer. Re(550) represents the in-plane retardation value of the cyclic olefin-based resin protective film at a wavelength of 550 nm. δ represents the SP value. Re(550)≥-38.37ln(S)-434.4δ+8063.
Description
Technical field [0001] The present invention relates to a laminate and a liquid crystal display device. Background technique [0002] Liquid crystal display devices have been assembled in various devices such as mobile devices such as mobile phones, personal computers, and even large televisions. In mobile devices such as mobile phones, a cover glass or a cover glass with a touch sensor component (hereinafter referred to as a touch panel) is placed on the surface of the viewing side. Or an optically transparent liquid adhesive (Liquid Optically Clear Adhesives, hereinafter referred to as LOCA) is placed between the touch panel and the liquid crystal panel and cured in many cases. By using LOCA, air bubbles can be prevented from entering between the liquid crystal panel and the protective glass or touch panel, thereby reducing light loss due to reflection. [0003] However, when LOCA is installed between the protective glass or the touch panel and the liquid crystal panel, the mai...
Claims
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IPC IPC(8): G02B5/30G02F1/1335
CPCG02F1/133528G02B5/30B32B27/32B32B7/12B32B2457/202
Inventor 崔动德松野健次
Owner SUMITOMO CHEM CO LTD