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Polarizer protection film, polarizing plate, and image display unit

A technology for protective films and polarizers, applied in the direction of polarizing elements, instruments, layered products, etc., can solve the problems of resin coloring yellowing, reduce, reduce heat resistance, etc., achieve excellent heat resistance, excellent ultraviolet absorption ability, Effect of Excellent Optical Transparency

Active Publication Date: 2008-04-02
NIPPON SHOKUBAI CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in such a polarizer protective film, there is a problem that the Tg after the addition of the ultraviolet absorber is significantly lower than the Tg (glass transition temperature) of the material resin before the addition of the ultraviolet absorber (the problem of lowering the heat resistance), and the resin Problems with coloring (yellowing)

Method used

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  • Polarizer protection film, polarizing plate, and image display unit
  • Polarizer protection film, polarizing plate, and image display unit

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0159] (polarizer)

[0160] A polyvinyl alcohol film having a thickness of 80 μm was dyed in a 5% by weight (weight ratio: iodine / potassium iodide=1 / 10) iodine aqueous solution. Next, it is immersed in an aqueous solution containing 3% by weight of boric acid and 2% by weight of potassium iodide, and then extended to 5.5 times in an aqueous solution containing 4% by weight of boric acid and 3% by weight of potassium iodide, and then immersed in an aqueous solution of 5% by weight of potassium iodide. middle. Then, drying was performed in an oven at 40° C. for 3 minutes to obtain a polarizer with a thickness of 30 μm.

[0161] (Manufacture of lactone-containing cycloacrylic resin)

[0162] 8000g of methyl methacrylate (MMA), 2000g of 2-(hydroxymethyl)methyl acrylate (MHMA) and 10000g of toluene were charged into a 30L reactor equipped with a stirring device, a temperature sensor, a cooling pipe, and a nitrogen introduction pipe In this regard, nitrogen gas was passed while h...

Embodiment 2

[0184] In the preparation of the polarizer protective film of Example 1, in addition to using 1 part of TINUVIN 1577 (manufactured by Ciba Specialty Chemicals) and 0.5 part of ADEKASTAB LA-31 (manufactured by Asahi Denka Industries) instead of 1 part of TINUVIN1577 (manufactured by Ciba Specialty Chemicals) 1 part and 1 part of ADEKASTAB LA-31 (manufactured by Soden Chemical Industry Co., Ltd.), the others were carried out in the same manner as in Example 1.

[0185] Table 1 shows the evaluation results of the obtained polarizer protective film and the evaluation results of the appearance of the obtained polarizer. In addition, in the obtained polarizing plate, the adhesiveness of the polarizer protective film and the polarizer was favorable, the polarizer and the polarizer protective film were integrated, and peeling did not generate|occur|produce.

Embodiment 3

[0187] In the preparation of the polarizer protective film of Example 1, in addition to using 0.5 part of TINUVIN1577 (manufactured by Ciba Specialty Chemicals) and 1 part of ADEKASTAB LA-31 (manufactured by Asahi Denka Industries) instead of 1 part of TINUVIN1577 (manufactured by Ciba Specialty Chemicals) Except for 1 part of ADEKASTAB LA-31 (manufactured by Asahi Denka Kogyo Co., Ltd.), the same procedure as in Example 1 was carried out.

[0188] Table 1 shows the evaluation results of the obtained polarizer protective film and the evaluation results of the appearance of the obtained polarizer. In addition, in the obtained polarizing plate, the adhesiveness of the polarizer protective film and the polarizer was favorable, the polarizer and the polarizer protective film were integrated, and peeling did not generate|occur|produce.

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Abstract

A polarizer protection film having an excellent ultraviolet absorption power, an excellent heat resistance and an excellent optical transparency; a polarizing plate little in external defect and using such a polarizer protection film and a polarizer, and a high-grade image display unit using such a polarizing plate. The polarizer protection film contains mainly (meta) acryl resin and some ultraviolet absorber, wherein the light transmittance of the polarizer protection film at a thickness of 80[mu]m and at 380nm is up to 30%, the difference between the Tg of the polarizer protection film and the Tg of a film the same as the polarizer protection film except that the latter does not contain the ultraviolet absorber is within 3 DEG C, and Y1 at a thickness of 80[mu]m is up to 1.3.

Description

technical field [0001] The present invention relates to a polarizer protective film, a polarizer using the film, and an image display device such as a liquid crystal display device, an organic EL display device, and a PDP including at least one polarizer. Background technique [0002] In a liquid crystal display device, it is indispensable in its image formation method to arrange polarizing plates on both sides of a glass substrate forming the surface of a liquid crystal panel. A polarizer is generally used on both sides of a polarizer made of a polyvinyl alcohol-based film and a dichroic material such as iodine, and a polarizer protective film such as triacetyl cellulose is pasted with a polyvinyl alcohol-based adhesive. polarizer. [0003] The polarizer protective film needs to have ultraviolet absorbing properties for the purpose of preventing deterioration of liquid crystals or polarizers caused by ultraviolet rays. At present, UV absorbers are added to the triacetyl c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B5/30G02B5/22G02F1/1335B32B7/02B32B27/18B32B27/28B32B27/30
CPCG02F2201/50G02F2201/086G02B5/3033G02F1/133528G02B1/105G02B5/208G02B1/14G02B5/22G02F1/1335
Inventor 乙咩重男寒川阳平上田贤一塘口直树千叶刚
Owner NIPPON SHOKUBAI CO LTD
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