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Polarizing plate

A polarizing film and adhesive technology, applied in polarizing elements, optics, instruments, etc., can solve difficult problems such as color tone change and light leakage suppression, and achieve the effect of small photoelastic coefficient

Inactive Publication Date: 2003-04-23
GUNZE LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] However, the above-mentioned polarizer only suppresses the decrease in polarization degree in a hot and humid environment, and it is difficult to sufficiently suppress color tone change and light leakage.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0081] 25 parts by weight of cycloolefin resin (ZEONOR1600R manufactured by Japan ZEON Co., Ltd.) was dissolved in 75 parts by weight of xylene, cyclohexane, toluene mixed solvent (the weight mixing ratio was 1:1:1), and cast method to make a film, and then apply 100W / m to both sides of the film in the air 2 Corona discharge treatment is carried out according to the treatment intensity, and then as the first layer of primer, a polyester polyol compound (Seika Dyne (Seikadain) LB manufactured by Dainichi Seika Industry Co., Ltd.) is coated on one side of the film. ) and polyisocyanate (Seika Dyne 3500A manufactured by Dainichi Seika Industry Co., Ltd.) (weight ratio 1:11), and then dried. The thickness after drying should reach 0.2 μm. Then, as the second layer of primer, apply a 5% aqueous solution of polyvinyl alcohol with an average degree of polymerization of 1500 and a degree of saponification of 99% on this layer, and then make it dry. The thickness after drying should re...

Embodiment 2

[0084] PVA film (Kurali vinylon film VF-9X75R manufactured by Kuraray Co., Ltd., thickness 75 μm) was immersed in an aqueous solution composed of 5000 parts by weight of water, 35 parts by weight of iodine, and potassium iodide of 525 parts by weight for 5 minutes for it to absorb iodine. Next, the film was stretched 4.4 times in the longitudinal direction in a 4% by weight aqueous solution of boric acid at 45° C., and then dried under tension to obtain a polarizing film.

[0085] Next, a 5% aqueous solution of PVA with an average degree of polymerization of 1800 and a degree of saponification of 99% is used as a binder in an undried state, but the thickness after drying is required to be 1 μm.

[0086] Next, the obtained polarizing film was laminated with the pair of protective films obtained in Example 1 so that the thickness of the obtained laminated body after drying was 1 µm, by sandwiching between them an average poly Degree is 1800, saponification degree is the 5% aque...

Embodiment 3

[0088] After storing the rolled protective film obtained in Example 1 at normal temperature for one month, a polarizing plate was produced in the same manner as in Example 2. Table 2 shows the evaluation results of this polarizing plate.

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Abstract

A polarizing plate which is substantially free from a decrease in the degree of polarization in a high-humidity high-temperature atmosphere, a hue change, and light leakage. The polarizing plate comprises a polarizing film based on polyvinyl alcohol and the following protective film which consists mainly of a cycloolefin resin, has the following anchoring agent coating comprising two layers, and is superposed on at least one side of the polarizing film with the following adhesive. The protective film has an optical in-plane phase difference change of 5 nm or less through 24-hr standing at 80 DEG C and had a wetting tension of 500 mu N / cm or higher (23 DEG C) on the side to be anchor-coated. The anchoring agent coating comprises a first layer formed from a polyisocyanate and a polyester polyol and / or polyether polyol and a second layer made of polyvinyl alcohol. The adhesive comprises polyvinyl alcohol.

Description

technical field [0001] The present invention relates to polarizers, and more specifically to highly durable and high-polarization polarizers for liquid crystal displays (LCDs). And the improvement of the polarizer. Background technique [0002] Conventional high-polarization polarizers are generally formed by absorbing iodine or dichroic dyes on polyvinyl alcohol (hereinafter referred to as PVA)-based films and aligning them with an aqueous solution of PVA resin as a binder. Or in a semi-dry fluid state, a triacetate cellulose film (hereinafter referred to as TAC) used as a protective film is laminated. [0003] However, due to the high water absorption and moisture permeability of TAC, the polarizer with TAC as a protective film has low polarization ability in a high-temperature and high-humidity environment. Light leak in Nicol's state. [0004] For this reason, it has been proposed to use a resin film with a small water absorption rate or moisture permeability as a pol...

Claims

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Application Information

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IPC IPC(8): G02B5/30
CPCY10T428/31573Y10T428/31931Y10T428/31928Y10T428/31855Y10T428/24364G02B5/3033Y10T428/31587Y10T428/31576G02B1/105G02B1/14G02B5/30
Inventor 石井良典山本健上杉孝雄渡边耕一
Owner GUNZE LTD
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