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Adhesion agent composition used in polarizer and polarizer utilizing the adhesion agent composition

A polarizing plate and adhesive technology, used in optics, adhesives, optical components, etc., can solve problems such as cracks, and achieve the effects of suppressing cracks, excellent bonding strength, and improving productivity

Active Publication Date: 2012-03-14
DONGWOO FINE CHEM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] On the other hand, when making a polarizing plate, there is a problem of cracking when the polarizing plate and the transparent protective film are bonded via a polyvinyl alcohol-based adhesive.
Cracks are local uneven defects at the interface between the polarizer and the transparent protective film

Method used

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  • Adhesion agent composition used in polarizer and polarizer utilizing the adhesion agent composition
  • Adhesion agent composition used in polarizer and polarizer utilizing the adhesion agent composition
  • Adhesion agent composition used in polarizer and polarizer utilizing the adhesion agent composition

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0065] (a) Production of polarizers

[0066] A polyvinyl alcohol film with an average degree of polymerization of about 2,400, a degree of saponification of 99.9 mol% or more, and a thickness of 75 μm was uniaxially stretched to about 5 times in a dry method, and the stretched state was maintained at 60° C. After being immersed in water for 1 minute, it was immersed in an aqueous solution having a weight ratio of iodine / potassium iodide / water at 28° C. of 0.05 / 5 / 100 for 60 seconds. Then, it was immersed in the aqueous solution whose weight ratio of 72 degreeC potassium iodide / boric acid / water was 8.5 / 8.5 / 100 for 300 second. Next, after washing with pure water at 26° C. for 20 seconds, it was dried at 65° C. to manufacture a polarizer in which iodine was adsorbed and aligned on a polyvinyl alcohol film.

[0067] (b) Manufacture of adhesive composition

[0068] Acetoacetyl-modified polyvinyl alcohol-based resin [trade name "Gohsenol Z200", Nippon Synthetic Chemical Industry Co...

Embodiment 2

[0072] In the step (b) of Example 1, the acetoacetyl-modified polyvinyl alcohol-based resin was diluted with a water / alcohol mixed solvent in such a manner that 3 parts were used for 100 parts of a water / alcohol mixed solvent, and An adhesive composition was produced in the same manner as in (b) of Example 1. The pH of this composition was 5.6, and the viscosity was 7.5 mPa·sec. A polarizing plate was fabricated in the same manner as in step (c) of Example 1 except for using this composition.

Embodiment 3

[0074] In the step (b) of Example 1, the acetoacetyl-modified polyvinyl alcohol-based resin was diluted with a water / alcohol mixed solvent in such a manner that 5 parts were used for 100 parts of the water / alcohol mixed solvent, and An adhesive composition was produced in the same manner as in (b) of Example 1. The composition had a pH of 5.6 and a viscosity of 17.0 mPa sec. A polarizing plate was fabricated in the same manner as in step (c) of Example 1 except for using this composition.

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Abstract

The invention provides an adhesion agent composition used in a polarizer and a polarizer utilizing the adhesion agent composition having an excellent adhesiveness and a risen warm water resistance, and capable of restraining a knick point to be generated. The adhesion agent composition used in the polarizer comprises a polyvinyl alcohol resin modified from acetoacety, water, an alcohol solvent of which the boiling point is below 100 DEG C, and a glyoxylate represented by the following chemical formula. Relative to 100 parts of water(by weight), the adhesion agent composition used in the polarizer comprises 1-8 parts(by weight) of polyvinyl alcohol resin modified from acetoacety, the weight ratio of the polyvinyl alcohol resin modified from acetoacety and a solid component of the glyoxylate is 1:0.03 to 1:0.25, the weight ratio of the water and the alcohol solvent is 99:1 to 30:70, and the PH value is between 4 to 10; in the formula, M represents an alkali metal or an alkaline-earth metal, n is 1 or 2.

Description

technical field [0001] The present invention relates to an adhesive composition for a polarizing plate and a polarizing plate using the same. More specifically, it relates to an adhesive composition under humidification and heating conditions, which improves the resistance to warm water and can suppress the generation of knicks. Adhesive composition for a polarizing plate and a polarizing plate using the same. Background technique [0002] In a liquid crystal display device, it is necessary to arrange polarizers on both sides of a glass substrate forming the surface of a liquid crystal panel from the viewpoint of its image forming method. A polarizer is usually obtained by dyeing a polyvinyl alcohol-based film with a dichroic material such as iodine, crosslinking with a crosslinking agent, and forming a film by uniaxial stretching. Since polarizers are made by stretching, they tend to shrink. Furthermore, since a polyvinyl alcohol-type film uses a hydrophilic polymer, it d...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09J129/14C09J11/06G02B5/30G02B1/10B32B7/12C09J129/04G02F1/1335
CPCC09J7/22C09J7/38C09J11/02C09J129/04C09J2203/318C09J2301/302C09J2301/312C09J2301/408
Inventor 柳廷昊能木直安
Owner DONGWOO FINE CHEM CO LTD
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