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Polarizing film, polarizing film with adhesive layer, and image display device

An adhesive layer and polarizing film technology, applied in the direction of film/sheet adhesives, adhesives, polarizing elements, etc., can solve problems such as cracks, difficulty in completely suppressing shrinkage, and inability to ignore changes in polarizer shrinkage stress, etc. Achieve the effect of reducing shrinkage and improving deterioration

Active Publication Date: 2019-01-04
NITTO DENKO CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The above-mentioned polarizing film has the following problem: under a severe environment such as thermal shock (for example, a thermal shock test in which temperature conditions of -40° C. and 85° C. are repeated), it is easy to damage the polarizer due to a change in the shrinkage stress of the polarizer. Cracks in the direction of the entire absorption axis (penetrating cracks)
However, even with the aforementioned polarizing film protected on both sides, the change in shrinkage stress of the polarizer cannot be ignored, and it is difficult to completely suppress the influence of shrinkage, and a certain degree of shrinkage of the optical film laminate including the polarizer cannot be avoided.

Method used

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  • Polarizing film, polarizing film with adhesive layer, and image display device
  • Polarizing film, polarizing film with adhesive layer, and image display device
  • Polarizing film, polarizing film with adhesive layer, and image display device

Examples

Experimental program
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Effect test

manufacture example 1

[0124] Production example 1 (manufacture of polarizing film (1))

[0125] Corona treatment was performed on one side of an amorphous isophthalic acid-copolyethylene terephthalate (IPA-co-PET) film (thickness: 100 μm) with a water absorption rate of 0.75% and a Tg of 75°C. Coating on the corona-treated surface at 25°C contains polyvinyl alcohol (polymerization degree: 4200, saponification degree: 99.2 mol%) and acetoacetyl modified PVA (polymerization degree: 1200, acetoacetyl group) in a ratio of 9:1. Modification rate: 4.6%, saponification degree: 99.0 mol% or more, Nippon Synthetic Chemical Industry Co., Ltd., trade name "GOHSEFIMER Z200") aqueous solution was dried to form a PVA-based resin layer with a thickness of 11 μm, and a laminate was produced.

[0126] The obtained laminate was stretched 2.0 times in the longitudinal direction (longitudinal direction) between rollers with different circumferential speeds in an oven at 120° C. (assisted stretching treatment in gas at...

manufacture example 2

[0136] Production example 2 (manufacture of polarizing film (2))

[0137] The ultraviolet curable adhesive produced in Example 1 was coated on the surface of the polarizer (thickness: 5 μm) of the optical film laminate obtained in Production Example 1 so that the thickness of the adhesive layer after curing became 0.1 μm. At the same time, a transparent protective film on the visible side (cycloolefin film with a thickness of 27 μm (trade name: ZD12-099063-C1300UHC, manufactured by Zeon Co., Ltd. in Japan), moisture permeability at 40°C and 92% R.H.: 24g / (m 2 days), linear expansion coefficient: 6.3×10 -5 / K, dimensional change rate: -0.28%, breaking strength: 20N), and then irradiate ultraviolet rays as active energy rays to cure the adhesive. Gallium-encapsulated metal halide lamp was used for ultraviolet irradiation, irradiation device: LightHAMMER10 manufactured by Fusion UV Systems, Inc., valve: V valve, peak illuminance: 1600mW / cm 2 , cumulative exposure 1000 / mJ / cm ...

manufacture example 3

[0138] Production example 3 (manufacture of polarizing film (3))

[0139]The surface of the polarizer (thickness: 5 μm) of the optical film laminate obtained in Production Example 1 was coated with a polyvinyl alcohol-based adhesive so that the thickness of the adhesive layer became 0.1 μm, and the visible side was bonded. Transparent protective film (acrylic film with a thickness of 40 μm (trade name: HX-40UC-1330, manufactured by Kaneka Co., Ltd.), moisture permeability at 40° C., 92% R.H.: 70 g / (m 2 days), linear expansion coefficient: 4.3×10 -5 / K, dimensional change rate: -0.5%, breaking strength: 39N), and then dried at 50° C. for 5 minutes. Next, the amorphous PET substrate was peeled off, and a polyvinyl alcohol-based adhesive was applied on the peeled surface so that the thickness of the adhesive layer became 0.1 μm, and at the same time, a transparent protective film on the side of the image display unit was pasted. (Acrylic film with a thickness of 20 μm (trade na...

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Abstract

This polarizing film has a first resin film on one surface of a polarizer that has a thickness of 10 [mu]m or less, while having a second resin film on the other surface of the polarizer; and the first resin film and the second resin film both have a water vapor permeability of 30 g / (m2.day) or less. This polarizing film also has a protective plate on a surface of the first resin film, said surface being on the reverse side of the polarizer-side surface. This polarizing film is obtained by laminating resin films having extremely low water vapor permeabilities on both surfaces of a polarizer that has a thickness of 10 [mu]m or less, and is able to suppress deterioration of the polarizer due to humidification (to have good humidification reliability), while being capable of suppressing the occurrence of through cracks even under severe thermal shock conditions.

Description

technical field [0001] The present invention relates to a polarizing film and a polarizing film with an adhesive layer having the polarizing film and an adhesive layer. Moreover, this invention relates to the image display apparatus containing the said polarizing film with an adhesive layer. Background technique [0002] In various image display devices, polarizing films are used for image display. For example, in a liquid crystal display (LCD), it is essential to arrange polarizing films on both sides of a glass substrate that forms the surface of a liquid crystal panel in view of its image formation method. In addition, for the organic EL display device, in order to shield the specular reflection of external light on the metal electrode, a circular polarizing film laminated with a polarizing film and a 1 / 4 wave plate is arranged on the visible side of the organic light-emitting layer. [0003] As the above-mentioned polarizing film, in general, one or both sides of a pol...

Claims

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Application Information

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IPC IPC(8): G02B5/30C09J7/20G02F1/1335
CPCG02F1/1335G02B5/30C09J7/20G02B5/3025
Inventor 吉村和也竹田哲郎鲭江岬北村吉绍新保史枝
Owner NITTO DENKO CORP