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Adhesive composition for polarizing plate and polarizing plate using same

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, improving productivity, excellent adhesion and temperature and water resistance

Active Publication Date: 2016-08-31
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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  • Adhesive composition for polarizing plate and polarizing plate using same
  • Adhesive composition for polarizing plate and polarizing plate using same
  • Adhesive composition for polarizing plate and polarizing plate using same

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 present invention provides an adhesive composition for a polarizing plate that has excellent adhesiveness and improved warm water resistance under humidified heating conditions, and can suppress occurrence of crack points, and a polarizing plate using the same. The provided adhesive composition for polarizing plates includes acetoacetyl-modified polyvinyl alcohol-based resin, water, an alcohol-based solvent with a boiling point of 100° C. or lower, and glyoxylate represented by the following chemical formula. 1 to 8 parts by weight of the acetoacetyl-modified polyvinyl alcohol-based resin is included with respect to 100 parts by weight of water, and the weight ratio of the solid content of the acetoacetyl-modified polyvinyl alcohol-based resin to glyoxylate is 1: 0.03 to 1:0.25, the weight ratio of water to alcohol solvent is 99:1 to 30:70, and the pH value is 4 to 10: In the formula, M represents alkali metal or alkaline earth metal, and 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 Patents(China)
IPC IPC(8): C09J129/14C09J11/06G02B5/30G02B1/14B32B7/12C09J129/04G02F1/1335
CPCC09J7/22C09J7/38C09J11/02C09J129/04C09J2203/318C09J2301/302C09J2301/312C09J2301/408
Inventor 柳廷昊能木直安
Owner DONGWOO FINE CHEM CO LTD