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Adhesive composition, adhesive and adhesive sheet

A composition and adhesive technology, applied in the fields of adhesives and adhesive sheets, adhesive compositions, adhesives (materials cross-linked by adhesive compositions) and adhesive sheets, can solve the deterioration of the durability of the adhesive layer and other problems, to achieve the effects of uneven color and blur suppression, excellent durability, and excellent followability of unevenness

Active Publication Date: 2016-05-04
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 pipe, 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 '- 0.08 parts by mass of azobisisobutylcyanide, and the air in the reaction vessel was replaced with nitrogen. The temperature of the reaction solution was raised to 60°C while stirring in this nitrogen atmosphere, and after reacting for 16 hours, it was cooled to room temperature. Here, a part of the obtained solution was subjected to molecular weight measurement by the following method, and production of a polymer (A) with 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, 200 parts by mass of ethyl acetate, Parts by mass, 0.16 parts b...

Embodiment 2-14

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

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

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

[0164]

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

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

[0167] TSKguardcolumNHXL-H

[0168] TSKgelGMHXL (×2)

[0169] TSKgelG2000HXL

[0170] ·Measurement solvent: tetrahydrofuran

[0171] ·Measurement temperature...

experiment example 1

[0172] [Experimental example 1] (Measurement of gel fraction)

[0173] To replace the polarizer used in the production of the polarizer with an adhesive layer in the examples or comparative examples, one side of the polyethylene terephthalate film is covered with a silicone release agent A peeling sheet (manufactured by Lintec Corporation, SP-PET3801, thickness: 38 μm) subjected to peeling treatment was used to prepare 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 manufacturing process of the example or the comparative example, the release sheet is stacked so that the adhesive The layer is in contact with the release-treated surface side. In this way, 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 50% RH. Thereafter, the a...

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Abstract

To provide an adhesive composition, an adhesive, and an adhesive sheet that have light diffusing properties and are excellent in stress relaxation rate, irregularity followability, and durability when applied to optical components such as polarizing plates. The composition contains a first (meth)acrylate polymer (A) with a Mw of 500,000 to 3 million, a second (meth)acrylate polymer (B) with a Mw of 8,000 to 300,000, and a crosslinking agent (C) and light-diffusing microparticles (D). The polymer (B) is 5-50 mass parts with respect to 100 mass parts of polymers (A). The polymer (B) contains a monomer having a functional group (b1) reactive with the crosslinking agent (C), and the ratio of the monomer is more than 1% by mass and less than 50% by mass in the polymer (B), and the polymer (B) (A) Light-diffusing microparticles containing no monomer having a functional group reactive with the crosslinking agent (C) or a monomer having a functional group (a1) having a lower reactivity with the crosslinking agent (C) than the functional group (b1) The quantity of (D) is 5.0-50.0 mass parts with respect to a total of 100 mass parts of polymers (A) and (B).

Description

technical field [0001] The present invention relates to an adhesive composition, an adhesive (a cross-linked material of the adhesive composition) and an adhesive sheet, and particularly relates to an adhesive composition suitable for optical components such as polarizing plates, an adhesive and an adhesive sheet. Adhesive sheet. Background technique [0002] In general, in a liquid crystal panel, when bonding a polarizing plate and a retardation plate to a glass substrate of a liquid crystal cell, etc., an adhesive layer obtained from an adhesive composition is often used. However, optical components such as polarizers and retardation plates tend to shrink due to heat, etc., and shrink due to thermal changes. As a result, the adhesive layer laminated on the optical components cannot follow the shrinkage, and the interface A problem of peeling (so-called floating, peeling) occurs. [0003] As a method to prevent this problem, (1) A method in which an adhesive layer with hi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
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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