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Adhesive composition and optical component using same

A composition and adhesive technology, applied in the direction of non-polymer adhesive additives, adhesive types, adhesive additives, etc., can solve the problems of reducing light leakage resistance and durability, and achieve excellent flexibility and durability , excellent durability, and excellent light leakage resistance

Active Publication Date: 2012-12-12
CHEIL IND INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, when an adhesive layer formed of the adhesive composition disclosed in Patent No. 4067173 is used for a polarizing plate, the adhesive layer migrates and separates over time, thereby reducing light leakage resistance and durability

Method used

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  • Adhesive composition and optical component using same
  • Adhesive composition and optical component using same
  • Adhesive composition and optical component using same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0067] The effects of the present invention will be described with reference to the following Examples and Comparative Examples. However, it is to be understood that the present invention is not limited to the illustrated embodiments and may be implemented in various ways.

[0068] The solid content and viscosity of the polymer solutions obtained in Preparation Examples and the weight average molecular weight of the polymer (A) were measured by the following methods.

[0069]

[0070] About 1 g of polymer solution was accurately measured on a precisely weighed glass plate. The solution was dried at 105°C for 1 hour and cooled to room temperature, after which the total weight and residual solids content of the glass plate was accurately measured. The weight of the glass plate was defined as X, the total weight of the glass plate and the polymer solution before drying was defined as Y, the total weight of the glass plate and the remaining solid content was defined as Z, and t...

preparation example 1

[0080]99 parts by weight of n-butyl acrylate (Nihon Shokubai, Co., Ltd.), 1 part by weight of 2-hydroxyethyl acrylate (Nihon Shokubai, Co., Ltd.) and 120 parts by weight of ethyl acetate In a flask equipped with a reflux condenser and a stirrer, and heated to 65 °C under a nitrogen atmosphere. 0.04 parts by weight of azobisisobutyronitrile (AIBN) was added, followed by polymerization for 6 hours while keeping the mixture at 65°C. After the polymerization was completed, the mixture was diluted with 280 parts by weight of ethyl acetate to obtain a solution of polymer (A-1). The solution of the polymer (A-1) had a solid content of 20 wt % and a viscosity of 4,500 mPa·s. In addition, polymer (A-1) had a weight average molecular weight of 1,600,000.

preparation example 2 to 18

[0082] Solutions of polymers (A-2) to (A-18) were prepared by the same method as Preparation Example 1, except that each monomer was mixed according to the composition listed in Table 2. Subsequently, the solid content and viscosity of the solutions of the polymers (A-2) to (A-18), and the weight average molecular weights of the polymers (A-2) to (A-18) were measured, and the results are shown in figure 1 in Table 2. In Table 2, "BA", "2EHA", "HEA", "4HBA", "HEAA" and "AA" refer to butyl acrylate, 2-ethylhexyl acrylate, 2-hydroxyethyl acrylate esters, 4-hydroxybutyl acrylate, N-2-hydroxyethylacrylamide and acrylic acid.

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Abstract

The invention provides an adhesive composition for forming an adhesive phase with good light leak resistance and durability and an optical component using the adhesive composition. The adhesive composition comprises, by weight, 100 parts of (methyl) acrylic ester copolymer. The (methyl) acrylic ester copolymer comprises, by weight, 0-9 parts of monomer containing carboxyl, 0-1.8 parts of (methyl) acrylic acid monomer containing carboxyl and 89.2-99.9 parts of (methyl) acrylate monomer (under the condition that the total amount of the monomer containing carboxyl and (methyl) acrylic acid monomer containing carboxyl is larger than 0) and has weight-average molecular weight as 1000000 to 2000000g / mol. The (methyl) acrylic ester copolymer further comprises, by weight, 0.05-5 parts of carbodiimide crosslinking agent.

Description

technical field [0001] The present invention relates to an adhesive composition and an optical element including the adhesive composition. More specifically, the present invention relates to an adhesive composition having excellent heat resistance and flexibility, and an optical element using the adhesive composition. Background technique [0002] Recently, flat panel displays (FPDs) such as LCDs, PDPs, and organic EL devices are increasingly being used. Accordingly, there is a need to improve the durability of pressure sensitive adhesives used in FPDs. In addition, when the pressure-sensitive adhesive is used for an LCD, it is necessary to prevent light leakage due to shrinkage of a polarizing plate. [0003] Japanese Patent No. 4067173 discloses an adhesive composition comprising a copolymer composition containing an alkyl acrylate monomer as a main component and an ethylenically unsaturated monomer reactive with an isocyanate group, and an adhesive having an isocyanate ...

Claims

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Application Information

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IPC IPC(8): C09J133/04C09J133/08C09J11/06C09J7/00G02B5/30
Inventor 小川博史诹访达弘宋政训
Owner CHEIL IND INC
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