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Polarizing plate and image display device including the polarizing plate

A technology of polarizers and polarizers, applied in the direction of optics, optical elements, polarizing elements, etc., can solve the problems of durability degradation, exacerbation of polarizer curling, unevenness, etc., achieve excellent optical properties and durability, and improve adhesion The effect of maintaining strength and durability

Active Publication Date: 2017-07-28
杉金光电(南京)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the prior art using a water-based adhesive, there was a problem of deterioration in durability due to insufficient adhesive strength between the polarizing plate and the polyethylene terephthalate (PET) film
However, when a water-based adhesive is used as an adhesive in a polarizing plate using different types of polymer films on both sides of the polarizing plate, since the polyterephthalic acid is The difference in water permeability between the glycol ester film and the polymer film different from the polyethylene terephthalate film creates a problem of the difference in drying efficiency, and thus exacerbates the problem of the polarizing plate. curly
If curling occurs in the polarizing plate, there is a problem that it is difficult to bond the polarizing plate in the lamination process of bonding the polarizing plate to the image display device, and there may be an increase in the defect rate due to the inflow of foreign matter
In addition, even after the polarizing plate is bonded to the image display device, a contact defect with the liquid crystal panel or a bending phenomenon of the liquid crystal panel is easily caused by curling of the polarizing plate
Therefore, since a large amount of strain is formed while the contact of the display device module with the module case occurs when the image display device is mounted on the display device module, light leakage or unevenness may be caused, resulting in image defect

Method used

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  • Polarizing plate and image display device including the polarizing plate
  • Polarizing plate and image display device including the polarizing plate
  • Polarizing plate and image display device including the polarizing plate

Examples

Experimental program
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Effect test

Embodiment 1

[0102] A primer composition comprising a polyester resin and an epoxy-based crosslinking agent is coated on one side of a polyethylene terephthalate film to prepare a polyethylene terephthalate film on which a primer layer is formed. Ethylene glycol formate film, the primer composition comprising 40 parts by weight of resin composition A115GE produced by Takamatsu Corporation obtained by mixing silicon dioxide and 57 parts by weight of water.

[0103] From a corona-treated triacetyl cellulose film such as NRT film manufactured by Fuji Photo Film Co. Ltd.

[0104] Then, the adhesive A prepared in Preparation Example 1 was coated on both sides of the polarizing plate, and then a polyethylene terephthalate film and a triacetylcellulose film (ie, an NRT film) were laminated on the coated surface. Adhesive A was applied to both sides of the polarizer, and the laminate was passed through a laminator. The polyethylene terephthalate film and the cellulose triacetate film were lamina...

Embodiment 2

[0124] A primer composition comprising a polyester resin and an epoxy-based crosslinking agent is coated on a polyethylene terephthalate film coated with a low-refractive index layer to manufacture a primer layer formed thereon. A polyethylene terephthalate film in which the low refractive index layer is formed by coating an acrylic resin mixed with 1,1,1-trifluoroethane on one side of the polyethylene terephthalate film, The primer composition comprises 40 parts by weight of resin composition A115GE produced by Takamatsu Corporation and obtained by mixing the polyester resin with an epoxy-based crosslinking agent, 3 parts by weight of silicon dioxide and 57 parts by weight of water .

[0125] Then, the poly(N-cyclohexanemaleimide-co-methyl methacrylate-co-α-methyl-styrene) resin composition is fed into the extruder from the raw material hopper to be replaced by nitrogen of extruder and melted at 240°C to prepare raw material pellets. After vacuum drying the obtained raw m...

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Abstract

The present invention relates to a polarizing plate having, in the following order, an adhesive layer, a primer layer and a polyethylene terephthalate film provided on at least one side of a polarizer. In the present invention, the adhesive layer is formed by an active energy ray-curable adhesive comprising: a first epoxy compound in which the glass transition temperature of a homopolymer is 120 ℃ or higher; a second epoxy compound in which the glass transition temperature of a homopolymer is 60 ℃ or lower; and a cationic photopolymerization initiator, and the primer layer is formed by a primer composition comprising: at least one binder resin selected from the group consisting of polyester and a polyvinyl alcohol-based resin; and at least one cross-linking agent selected from the group consisting of an acryl-based cross-linking agent, an epoxy-based cross-linking agent and a polyvinyl alcohol-based cross-linking agent.

Description

technical field [0001] The present invention relates to a polarizing plate and an image display device including the polarizing plate, and more particularly, to a polarizing plate having a polyethylene terephthalate film as a protective film formed on at least one side of the polarizing plate. plate and an image display device including the polarizing plate. Background technique [0002] Liquid crystal displays (LCDs) have recently been applied to various display devices due to characteristics of liquid crystal displays (LCDs), such as low power consumption, low-voltage operation, lightness, and thinness. Such LCDs are made of various materials, including liquid crystal cells, polarizers, retardation films, light-condensing sheets, light-diffusing sheets, light-guiding plates, and light-reflecting sheets. Therefore, improvements have been actively made to achieve progress in productivity, weight reduction, and improvement in LCD brightness by reducing the number of films in...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02B5/30B32B27/30C08J5/18G02F1/1335
CPCG02B5/3033B32B7/12B32B27/08B32B27/308B32B27/32B32B27/36B32B27/365B32B27/38B32B2307/412B32B2307/418B32B2307/42B32B2457/202B32B2457/206G02F1/133528
Inventor 南星铉徐银美南承希李大雄罗钧日
Owner 杉金光电(南京)有限公司