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Pressure sensitive adhesive composition, pressure sensitive adhesive and pressure sensitive adhesive sheet

A pressure-sensitive adhesive sheet and pressure-sensitive adhesive technology, which are used in the fields of pressure-sensitive adhesive compositions, pressure-sensitive adhesives and pressure-sensitive adhesive sheets, and can solve the problem of cloudiness, insufficient improvement of stress relaxation, etc. problem, to achieve the effect of excellent stress relaxation, light leakage resistance and excellent durability

Active Publication Date: 2011-06-29
LINTEC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, in a pressure-sensitive adhesive composition to which a urethane elastomer is added, the addition amount of the urethane elastomer is limited from the viewpoint of compatibility with other components, so stress relaxation properties Insufficient improvement, and problems such as cloudiness due to compatibility of acrylic pressure-sensitive adhesives and urethane elastomers

Method used

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  • Pressure sensitive adhesive composition, pressure sensitive adhesive and pressure sensitive adhesive sheet
  • Pressure sensitive adhesive composition, pressure sensitive adhesive and pressure sensitive adhesive sheet
  • Pressure sensitive adhesive composition, pressure sensitive adhesive and pressure sensitive adhesive sheet

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0126] 1. Process (1)

[0127] 97.0 parts by mass of n-butyl acrylate, 3.0 parts by mass of acrylic acid, 150.0 parts by mass of acetone, and 2,2'-azo 0.06 parts by mass of diisobutyronitrile, and the air in the reaction container was replaced with nitrogen. While stirring in this nitrogen atmosphere, the temperature of the reaction solution was raised to 60° C., and the reaction solution was allowed to react for 6 hours, and then cooled to room temperature. Here, GPC measurement was performed on a part of the obtained solution by the method described later, and it was confirmed that a copolymer (A) having a weight average molecular weight of 1,500,000 was produced. In addition, the conversion rate (a value obtained by dividing the mass of the copolymer obtained by polymerizing the monomers by the total mass of the monomers used as raw materials) at this time was 80%.

[0128] 2. Process (2)

[0129] To the solution in the copolymer (A) obtained by the above step (1), 150 p...

Embodiment 2～34

[0152] [Examples 2-34, Comparative Examples 1-6]

[0153] The reaction conditions were adjusted so that the conversion rate of the copolymer (A) was the value in Table 1, and at the same time, the addition amount of each monomer was changed so that the ratio of each monomer constituting the pressure-sensitive adhesive composition was the value in Table 1, Other than that, it carried out similarly to Example 1, and produced the polarizing plate with a pressure-sensitive adhesive layer.

Embodiment 35

[0155] By copolymerizing 97 parts by mass of butyl acrylate and 3 parts by mass of acrylic acid by a normal polymerization method, a copolymer (A) having a weight average molecular weight of 1.5 million (measured by GPC) was obtained. Similarly, a copolymer (B) having a weight average molecular weight of 40,000 (measured by GPC) was obtained by copolymerizing 90 parts by mass of butyl acrylate and 10 parts by weight of 2-hydroxyethyl acrylate.

[0156] 80 parts by mass of the obtained copolymer (A) and 20 parts by mass of the copolymer (B) were mixed, diluted with methyl ethyl ketone so that the solid content concentration would be 20%, and an acrylic polymer was obtained. Thereafter, in the same manner as in Example 1, a diluted solution of the pressure-sensitive adhesive composition was obtained. Then, using the diluted solution of this pressure-sensitive adhesive composition, it carried out similarly to Example 1, and produced the polarizing plate with a pressure-sensitive ...

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Abstract

The invention provides a pressure sensitive adhesive composition with both excellent light-leak resistance and durability when applicable to optical components such as polarizer and the like, a manufacturing method of the pressure sensitive adhesive composition, a pressure sensitive adhesive and a pressure sensitive adhesive sheet. The pressure sensitive adhesive composition comprises a first (methyl) acrylate copolymer (A) with a weight average molecular weight of 700-2500 thousands, a second (methyl) acrylate copolymer (B) with a weight average molecular weight of 8-250 thousands, and a crosslinking agent (C), wherein the content of the second (methyl) acrylate copolymer (B) with respect to 100 parts by weight of the first (methyl) acrylate copolymer (A) is 5-50 parts by weight; the second (methyl) acrylate copolymer (B) contains a monomer which has a functional group (b1) with high reactivity with the crosslinking agent (C) and is used as a component element, and furthermore the content of the monomer in the second (methyl) acrylate copolymer (B) is more than 1 wt%; the first (methyl) acrylate copolymer (A) does not contain a monomer which has a functional group with reactivity with the crosslinking agent (C) and is used as a component element, or contains a monomer which has a functional group (a1) with lower reactivity with the crosslinking agent (C) than the functional group (b1) of the second (methyl) acrylate copolymer (B) and is used as a component element.

Description

technical field [0001] The present invention relates to a pressure-sensitive adhesive composition, a method for producing the pressure-sensitive adhesive composition, a pressure-sensitive adhesive (a material obtained by crosslinking the pressure-sensitive adhesive composition), and a pressure-sensitive adhesive sheet, In particular, it is related with the pressure-sensitive adhesive composition suitable as optical members, such as a polarizing plate, the manufacturing method of a pressure-sensitive adhesive composition, a pressure-sensitive adhesive, and a pressure-sensitive adhesive sheet. Background technique [0002] Generally, in a liquid crystal panel, in order to bond a polarizing plate and a phase difference plate to a glass substrate etc., the pressure-sensitive adhesive layer which consists of a pressure-sensitive adhesive composition is often used. However, it has been pointed out that optical members such as polarizers and retardation plates tend to shrink due to...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09J133/04C09J133/08C09J11/06C09J7/02
CPCC09J4/00C09J7/22C09J7/385C09J7/403C09J11/00C09J133/04C09J2203/318C09J2301/302C09J2301/40C09J2301/408
Inventor 荒井隆行又野仁黑川敦史
Owner LINTEC CORP
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