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Adhesive composition, adhesive and adhesive sheet

A technology of adhesives and compositions, applied in the field of adhesives and adhesive sheets, adhesive compositions, adhesives (materials cross-linked with adhesive compositions) and adhesive sheets, which can solve the problem of poor durability of the adhesive layer It achieves the effects of color unevenness and blur suppression, excellent durability, and excellent tracking of unevenness

Active Publication Date: 2013-01-23
LINTEC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the introduction of low-molecular-weight components has the problem of deteriorating the durability of the adhesive layer.

Method used

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  • Adhesive composition, adhesive and adhesive sheet
  • Adhesive composition, adhesive and adhesive sheet
  • Adhesive composition, adhesive and adhesive sheet

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0140] 1. Modulation of polymer (A)

[0141]Into a reaction vessel equipped with a stirrer, a thermometer, a reflux cooler, a dropping device, and a nitrogen introduction tube, 95.0 parts by mass of n-butyl acrylate, 5.0 parts by mass of acrylic acid, 200 parts by mass of ethyl acetate, and 2,2 parts by mass were added '-0.08 mass part of azobisisobutyl cyanide, the air in the said reaction container was replaced with nitrogen gas. The temperature of the reaction solution was raised to 60° C. while stirring in this nitrogen atmosphere, and after 16 hours of reaction, it was cooled to room temperature. Here, a part of the obtained solution was subjected to molecular weight measurement by the following method, and the production of a polymer (A) having a weight average molecular weight of 1.5 million was confirmed.

[0142] 2. Modulation of polymer (B)

[0143] 85.0 parts by mass of n-butyl acrylate, 15.0 parts by mass of 2-hydroxyethyl acrylate, and 200 parts by mass of eth...

Embodiment 2-14

[0161] [Example 2-14, Comparative Example 1-7]

[0162] The types and proportions of monomers constituting the adhesive composition, the types and blending amounts of crosslinking agents, light-diffusing fine particles, and silane coupling agents, and the blending ratios of polymer (A) and polymer (B) are shown in Table 1. Except the change, it carried out similarly to Example 1, and produced the polarizing plate with an adhesive bond layer.

[0163] Here, the above-mentioned weight average molecular weight (Mw) is a polystyrene-equivalent weight average molecular weight measured (GPC measurement) using gel permeation chromatography (GPC) under the following conditions.

[0164]

[0165] ・GPC measurement device: HLC-8020 manufactured by TOSOH Corporation

[0166] ・GPC column (passed in the following order): manufactured by TOSOH

[0167] TSK guard colum NHXL-H

[0168] TSK gel GMHXL (×2)

[0169] TSK gel G2000HXL

[0170] Measurement solvent: tetrahydrofuran

[0171] ・...

experiment example 1

[0172] [Experimental Example 1] (Measurement of Gel Fraction)

[0173] When making the polarizer with the adhesive layer in the example or the comparative example, the polarizer used was replaced, and one side of the polyethylene terephthalate film was applied with a silicone-based release agent. A release sheet (manufactured by Lintec Co., Ltd., SP-PET3801, thickness: 38 μm) subjected to a release treatment was prepared as an adhesive sheet. Specifically, on the exposed adhesive layer of the structure composed of the release sheet / adhesive layer (thickness: 25 μm) obtained in the production process of the example or the comparative example, the release sheet was stacked on the exposed adhesive layer, so that the adhesive The layer is in contact with the release-treated surface side. Thus, an adhesive sheet having a structure of release sheet / adhesive layer / release sheet was obtained.

[0174] The obtained adhesive sheet was aged for 7 days under the conditions of 23°C and 5...

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Abstract

The invention provides an adhesive composition, an adhesive and an adhesive sheet which are suitable for optical components, such as polarization light panel, etc., and have light diffusivity, good stress relaxation rate, uneveness follow-up property and durability. The composition contains first (methyl) acrylic ester polymers (A) having a Mw of 500-3000 thousands, second (methyl) acrylic ester polymers (B) having a Mw of 80000-300 thousands, a cross-linking agent (C) and light diffusion micro-particles(D). The ratio of the polymers (B) with respect to 100 parts by mass of the polymers (A) is 5 to 50 parts by mass. The polymers (B) contain monomers having functional groups (b1) reacting with the cross-linking agent (C), and the ratio of the monomers in the polymers (B) is more than 1 mass% and less than 50 mass%. The polymers (A) do not contain monomers having functional groups reacting with the cross-linking agent (C) or contain monomers having functional groups (a1) having reactiveness with the cross-linking agent (C) lower than that of the functional groups (b1). The ratio of the light diffusion micro-particles(D) with respect to 100 parts by mass of the polymers (A) and the polymers (B) is 5.0 to 50.0 parts by mass.

Description

technical field [0001] The present invention relates to an adhesive composition, an adhesive (material obtained by crosslinking the adhesive composition), and an adhesive sheet, and in particular, to an adhesive composition suitable for optical components such as polarizers, the adhesive and the adhesive sheet. sticky sheet. Background technique [0002] Generally, in a liquid crystal panel, when adhering a polarizing plate and a retardation plate to a glass substrate of a liquid crystal cell, etc., an adhesive layer formed from an adhesive composition is often used. However, optical members such as polarizers and retardation plates tend to shrink due to heat, etc., and shrinkage due to thermal changes occurs. As a result, the adhesive layer stacked on the optical members cannot follow the shrinkage, and the interface The problem of peeling (so-called floating, peeling) occurs. [0003] As a method of preventing this problem, (1) a method of suppressing shrinkage of the op...

Claims

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Application Information

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IPC IPC(8): C09J133/08C09J133/14C09J11/06C09J11/00C09J7/02
CPCC09J7/22C09J7/38C09J7/385C09J133/04C09J175/04C09J2301/41
Inventor 小泽祐树又野仁荒井隆行所司悟
Owner LINTEC CORP
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