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One-side protected polarizing film, polarizing film with adhesive layer, image display device, and method for continuously manufacturing image display device

A technology of adhesive layer and polarizing film, applied in the direction of identification device, polarizing element, lighting device, etc., can solve the problems of insufficient durability, easy generation, cracks, etc., achieve small changes in shrinkage stress, and suppress the generation of through cracks Effect

Active Publication Date: 2018-11-09
NITTO DENKO CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In addition, the polarizing film and the polarizing film with an adhesive layer are prone to exist under the harsh environment of thermal shock (for example, a thermal shock test of repeated temperature conditions of -30°C and 80°C or a test at a high temperature of 100°C). The problem that cracks (through cracks) are generated in the direction of the absorption axis of the entire polarizer due to changes in the shrinkage stress of the polarizer
That is, the polarizing film with an adhesive layer has insufficient durability due to thermal shock in the above-mentioned severe environment
In particular, for a polarizing film with an adhesive layer that uses a single-side protective polarizing film provided with a protective film on only one side of the polarizer from the viewpoint of thinning, the durability due to the above-mentioned thermal shock insufficient
In addition, when the size of the polarizing film becomes larger, penetrating cracks caused by the above-mentioned thermal shock are likely to occur.

Method used

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  • One-side protected polarizing film, polarizing film with adhesive layer, image display device, and method for continuously manufacturing image display device
  • One-side protected polarizing film, polarizing film with adhesive layer, image display device, and method for continuously manufacturing image display device
  • One-side protected polarizing film, polarizing film with adhesive layer, image display device, and method for continuously manufacturing image display device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0170] (Manufacturing of one-sided protective polarizing film A1)

[0171] On the surface of the polarizer A1 of the above-mentioned optical film laminate, the above-mentioned ultraviolet curable adhesive is applied so that the thickness of the adhesive layer after curing is 0.5 μm, and the above-mentioned protective film is attached, and then irradiated as active energy rays. UV light to cure the adhesive. Gallium-encapsulated metal halide lamp was used for ultraviolet irradiation, irradiation device: Light HAMMER10 manufactured by Fusion UV Systems, Inc., valve: V valve, maximum illuminance: 1600mW / cm 2 , cumulative exposure 1000 / mJ / cm 2 (Wavelength: 380-440 nm), and the illuminance of an ultraviolet-ray was measured using the Sola-Check system by Solatell company. Next, the amorphous PET base material was peeled off, and the one-sided protective polarizing film A1 using a thin polarizer was produced.

[0172](Manufacture of single-side protective polarizing film with tra...

Embodiment 2～7、 comparative example 1～3

[0177] In Example 1, as shown in Table 1, the type (thickness) of the polarizer, the forming material of the transparent layer, and the thickness were changed. In the same manner as in Example 1, a single-side protective polarizing film with a transparent A protective polarizing film on one side of the layer, and a polarizing film with an adhesive layer. In addition, in Comparative Examples 1 and 3, no transparent layer was formed.

[0178] The following evaluation was performed about the polarizing film with an adhesive layer obtained in the said Example and the comparative example. The results are shown in Table 1. Unless otherwise specified, the following evaluations were performed under the conditions of 23° C. and 65% RH.

[0179]

[0180] The single-body transmittance T and the degree of polarization P of the obtained one-side protective polarizing film were measured using a spectral transmittance meter (Dot-3c of Murakami Color Technology Laboratory) with an integra...

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Abstract

The present invention is a one-side protected polarizing film having a protected film solely on one side of a polarizer, wherein the one-side protected polarizing film is characterized in that: the polarizer contains a polyvinyl alcohol resin, has a thickness of 10 [mu]m or less, and is configured so that optical characteristics represented by a single transmittance T and a polarization degree P satisfy the following relationship P >-(100.929T-42.4-1)*100 (where T < 42.3) or P >= 99.9 (where T >= 42.3); a transparent layer is present on the other surface of the polarizer; and the dynamic friction coefficient of the surface on which the protective film is present is 0.2 or less. In this one-side protected polarizing film, it is possible to inhibit defects due to penetrating cracks and nanoslits even though the polarizer has predetermined optical characteristics and a thickness of 10 [mu]m or less.

Description

technical field [0001] The present invention relates to a single-side protective polarizing film provided with a protective film only on one side of a polarizer, and a polarizing film with an adhesive layer comprising the single-side protective polarizing film and an adhesive layer. The one-sided protective polarizing film and the polarizing film with an adhesive layer can be used alone or in the form of an optical film laminated to form an image display device such as a liquid crystal display (LCD) or an organic EL display. Background technique [0002] For liquid crystal display devices, it is essential to arrange polarizing films on both sides of the glass substrate forming the surface of the liquid crystal panel in view of its image forming method. As the polarizing film, generally, a polarizing film formed of a polyvinyl alcohol-based film and a dichroic material such as iodine is bonded to one or both sides of a polarizer with a polyvinyl alcohol-based adhesive or the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B5/30B32B27/00B32B27/30G02F1/1335G09F9/00H05B33/02H05B33/14
CPCG02B5/3041G02F1/133305G02F1/133528G02F2202/28G09F9/00G02B1/14H05B33/02H05B33/14B32B7/12B32B27/08B32B27/18B32B27/306B32B27/308B32B33/00B32B2255/10B32B2255/26B32B2307/412B32B2307/42B32B2307/514B32B2457/206G02B5/30G02F1/1335B32B27/20B32B27/302
Inventor 上野友德平冈慎哉池岛裕美岸敦史
Owner NITTO DENKO CORP
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