Pressure-sensitive adhesive type polarizer with retardation layer, process for producing the same, optical film, and image display

一种相位差层、偏振片的技术，应用在粘合剂类型、光学、光学元件等方向，能够解决缺乏粘附性、不能跟随偏振片等问题，达到形状改善、抑制光学特性的变化、抑制脱层的效果

Active Publication Date: 2007-11-28
NITTO DENKO CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, an adhesive layer with excellent stress relaxation usually lacks adhesiveness, so it cannot follow the severe dimensional shrinkage behavior of the polarizer in the thermal shock test, and defects in appearance such as peeling and foaming occur.

Method used

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  • Pressure-sensitive adhesive type polarizer with retardation layer, process for producing the same, optical film, and image display

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0198] (polarizer)

[0199] A 75 μm thick polyvinyl alcohol film having an average degree of polymerization of 2400 and a degree of saponification of 99.9 mol % was immersed in warm water at 30° C. for 60 seconds to swell. Next, the film was stretched by dipping in an iodine aqueous solution having a concentration of 0.4% of iodine / potassium iodide (weight ratio = 1 / 7), and dyed at a stretching ratio of 3.5 times. Then, stretching was carried out in a borate aqueous solution at 65° C. so that the total stretching ratio became 6 times, and further, it was immersed in an aqueous solution having a potassium iodide concentration of 3% at 30° C. for 5 seconds. After stretching, it was dried in an oven at 40° C. for 3 minutes to obtain a polarizer. The single transmittance of the polarizer is 42.4%.

[0200] (transparent protective film)

[0201] A triacetylcellulose film with a thickness of 80 μm was used.

[0202] (Transparent protective film with retardation layer)

[0203] ...

Embodiment 2

[0213] (polarizer)

[0214] In Example 1, a polarizer was obtained in the same manner as in Example 1, except that the concentration of the iodine aqueous solution was changed to 0.37%, and the single transmittance of the obtained polarizer was changed to 43.2%.

[0215] In Example 1, except having used the polarizer obtained above, it carried out similarly to Example 1, the polarizing plate with a retardation layer was produced, and the polarizing plate with an adhesive type retardation layer was further produced. The dimensional shrinkage rate of the polarizing plate with a retardation layer was 0.40%.

Embodiment 3

[0217] (preparation of adhesive)

[0218] Put 95 parts of butyl acrylate, 5 parts of acrylic acid, 0.1 part of 2-hydroxyethyl acrylate, 0.05 parts of 2,2'-azobisisobutyronitrile and ethyl acetate into a 4-necked flask equipped with a nitrogen introduction tube and a cooling tube. 200 parts of esters were sufficiently replaced with nitrogen, and then polymerized at 55° C. for 20 hours while stirring under a nitrogen stream to obtain an acrylic acid polymer with a weight average molecular weight of 1.57 million. With respect to 100 parts of the solid content of the above-mentioned acrylic polymer solution, 0.08 parts of 3-glycidoxypropyltrimethoxysilane was uniformly mixed, and further, toluene disulfide made of trimethylolpropane was uniformly mixed as a crosslinking agent. 0.8 parts of a polyisocyanate-based crosslinking agent composed of an isocyanate adduct was used to obtain an acrylic adhesive.

[0219] (Manufacture of adhesive type polarizing plate with retardation layer...

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Abstract

The present invention provides a pressure-sensitive adhesive type retardation-layer-possessing polarizer (4) obtained by forming a polarizer (2) comprising an iodine-containing polarizing element (1) and transparent protective films superposed respectively on both sides thereof, disposing a retardation layer on at least one of the transparent protective films of the polarizer (2) to produce a retardation-layer-possessing polarizer (3), and further superposing a pressure-sensitive acrylic adhesive layer on the retardation layer side. In the iodine-containing polarizing element (1), the ratio of the content of potassium (K) (wt.%) to the content of iodine (I) (wt.%), (K / I), is 0.200-0.235. In the polarizer (2), the iodine-containing polarizing element (1) has been laminated to the transparent protective films through an adhesive layer formed from a water-soluble adhesive comprising a polyvinyl alcohol resin having acetoacetyl groups and a crosslinking agent. The retardation-layer-possessing polarizer (3) has a degree of shrinkage in the absorption axis direction, as measured after 24-hour standing at 80 DEG C and expressed by the following equation, of 0.5% or lower. The pressure-sensitive adhesive type retardation-layer-possessing polarizer (4) by itself has a transmittance of 41.0-43.2%. This pressure-sensitive adhesive type retardation-layer-possessing polarizer can be inhibited from changing in optical properties even under high-temperature high-humidity conditions and can keep visibility high.

Description

technical field [0001] The invention relates to an adhesive polarizer with retardation layer and its manufacturing method. The adhesive type polarizing plate with a retardation layer can be used as an optical film alone or laminated as an optical film, and can form flat panel displays such as liquid crystal display devices (hereinafter abbreviated as LCD) and electroluminescent display devices (hereinafter abbreviated as ELD), Image display devices such as PDPs. Background technique [0002] Conventionally, polarizers used in LCDs generally use polarizers in which transparent protective films are bonded to both surfaces of polarizers with adhesives. As a polarizer, a polyvinyl alcohol-based polarizer that is orientated by absorbing iodine to polyvinyl alcohol and stretching is generally used, and as a transparent protective film, triacetyl cellulose is generally used. Moreover, in order to laminate|stack on a liquid crystal cell etc., the acrylic-type adhesive layer formed...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B5/30G02F1/1335C09J129/00G02F1/13363C09J133/00
CPCC09J133/08G02B5/305C09J129/04C09J133/02Y10T428/1059C09J133/06C09J2201/606C08K5/0025Y10T156/10C09J2301/302C09K2323/05G02B5/30G02F1/1335
Inventor 宫武稔水岛洋明外山雄祐济木雄二新田直幸
Owner NITTO DENKO CORP
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