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Adhesive composition, adhesive and adhesive sheet

A technology of composition and adhesion, applied in the direction of adhesive type, ester copolymer adhesive, polyurea/polyurethane adhesive, etc., can solve insufficient stress relaxation rate, insufficient reusability, adhesion Solve the problems of poor durability of the agent, and achieve the effects of excellent durability, good reusability, and light leakage prevention

Active Publication Date: 2016-02-17
LINTEC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the durability of the adhesive is poor, for example, the adhesive interface is peeled off under hot and humid conditions
In addition, the stress relaxation rate is not sufficient, and when it is used in optical components such as polarizers, light leakage may occur
Furthermore, the adhesive force tends to increase after attachment or over time, and the reusability is not sufficient

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 approach

[0029] Embodiments of the present invention will be described below.

[0030] 〔Adhesive composition〕

[0031] The adhesive composition of this embodiment contains the first (meth)acrylate polymer (A) with a weight average molecular weight (Mw) of 500,000 to 3 million, the weight average molecular weight (Mw) and the first polymer (A) with a weight average molecular weight (Mw) of 80 million to 300,000. 2. The (meth)acrylate polymer (B) and the crosslinking agent (C) preferably further contain a silane coupling agent (D). In addition, in this specification, (meth)acrylate has the meaning of both acrylate and methacrylate. The same applies to other similar terms. In addition, "polymer" also includes the concept of "copolymer".

[0032] The first (meth)acrylate polymer (A) and the second (meth)acrylate polymer (B) respectively do not substantially contain acidic groups, and the polymers contain Hydroxyl monomers (monomers containing hydroxyl groups in the molecule), prefera...

Embodiment 1

[0103] 1. Modulation of Polymer (A)

[0104] In a reaction vessel with a stirrer, a thermometer, a reflux cooler, a dropping device, and a nitrogen introduction pipe, add 99.0 parts by mass of n-butyl acrylate, 1.0 parts by mass of 2-hydroxyethyl acrylate, 200 parts by mass of ethyl acetate, and 0.08 parts by mass of 2,2'-azobisisobutylcyanide, and the air in the reaction vessel was replaced with nitrogen. Stirring was carried out under this nitrogen atmosphere, the temperature of the reaction solution was raised to 60° C., and the reaction was performed for 16 hours, and then 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 1.57 million was confirmed.

[0105] 2. Modulation of polymer (B)

[0106] 85.0 parts by mass of n-butyl acrylate, 15.0 parts by mass of 2-hydroxyethyl acrylate, 200 parts by mass of ethyl aceta...

Embodiment 2-10

[0126] [Examples 2-10, Comparative Examples 1-7]

[0127] Except for changing the types and proportions of the monomers constituting the adhesive composition, the types and compounding amounts of the crosslinking agent and the silane coupling agent, and the compounding ratio of the polymer (A) and the polymer (B) as shown in Table 1. , in the same manner as in Example 1, a polarizing plate having an adhesive layer was produced.

[0128] Here, the above-mentioned weight average molecular weight (Mw) is a weight average molecular weight in terms of polystyrene measured by gel permeation chromatography (GPC) under the following conditions (GPC measurement).

[0129]

[0130] ・GPC measurement device: HLC-8020, manufactured by TOSOH

[0131] · GPC column (passed in the following order): manufactured by TOSOH

[0132] TSKguardcolumNHXL-H

[0133] TSKgelGMHXL (×2)

[0134] TSKgelG2000HXL

[0135] ·Measurement solvent: tetrahydrofuran

[0136] ·Measurement temperature: 40℃ ...

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Abstract

To provide an adhesive composition, an adhesive, and an adhesive sheet that are excellent in stress relaxation rate and prevent light leakage when applied to optical components such as polarizing plates, have excellent durability, and are also good in reusability. The adhesive composition of the present invention contains a first (meth)acrylate polymer (A) having a weight average molecular weight of 500,000 to 3 million, and a second (meth)acrylate polymer (A) having a weight average molecular weight of 8,000 to 300,000. Polymer (B) and Crosslinker (C). Each of the first (meth)acrylate polymer (A) and the second (meth)acrylate polymer (B) does not substantially contain an acidic group, and contains a hydroxyl group-containing monomer. The hydroxyl group-containing monomer contained in the 1st (meth)acrylate polymer (A) and the hydroxyl group-containing monomer contained in the 2nd (meth)acrylate polymer (B) are the same kind. The molar ratio of the hydroxyl group contained in the 2nd (meth)acrylate polymer (B) with respect to the hydroxyl group contained in the 1st (meth)acrylate polymer (A) is 1.0-40.

Description

technical field [0001] The present invention relates to an adhesive composition, an adhesive (a material obtained by crosslinking the adhesive composition), and an adhesive sheet. In particular, it relates to an adhesive composition, an adhesive, and an adhesive sheet that are suitably used as optical components such as polarizers. Background technique [0002] In general, in a liquid crystal panel, an adhesive layer formed from an adhesive composition is often used for bonding a polarizing plate and a retardation plate to a glass substrate or the like of a liquid crystal cell. However, optical components such as polarizers and retardation plates tend to shrink due to heat or the like. As a result, it is difficult for the adhesive layer laminated on the optical components to follow the shrinkage, and peeling occurs at the interface (so-called Levitation, peeling), the deviation of the optical axis of the optical component due to the stress caused by the contraction of the op...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09J133/08C09J133/14C09J11/06C09J7/02
CPCC09J7/22C09J7/38C09J7/385C09J133/04C09J175/04C09J2203/318C09J2301/302G02B5/005
Inventor 黑川敦史又野仁荒井隆行所司悟
Owner LINTEC CORP
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