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Adhesive composition, adhesive and adhesive sheet

A technology of adhesion and composition, applied in the direction of adhesive type, ester copolymer adhesive, polyurea/polyurethane adhesive, etc., can solve the problem of insufficient optical properties of the adhesive composition and white spots of the adhesive composition , high haze value, etc., to achieve the effect of excellent durability, high stress relaxation, and haze value reduction

Active Publication Date: 2017-04-12
LINTEC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0016] However, the compatibility between the acrylate copolymer, which is the main component of the adhesive, and the polyrotaxane having cyclodextrin is not good. Even if the polyrotaxane is added in a small amount, white spots will occur in the adhesive composition, and the haze value will be reduced. becomes high, and the optical properties of the adhesive compositions described in Patent Documents 5-7 are insufficient

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

[0130] 1. Modulation of Polymer (A)

[0131]98.5 parts by mass of n-butyl acrylate, 1.5 parts by mass of 2-hydroxyethyl acrylate, and 200 parts by mass of ethyl acetate in a reaction vessel with a stirrer, a thermometer, a circulating cooler, a dropping device, and a nitrogen introduction pipe , and 0.08 parts by mass of 2,2'-azobisisobutyronitrile, and the air in the reaction container was replaced with nitrogen. Stirring was carried out under the nitrogen atmosphere, the temperature of the reaction solution was raised to 60° C., and after 16 hours of reaction, it was cooled to room temperature. Here, the molecular weight of a part of the obtained solution was measured by the following method, and the production of the polymer (A) with a weight average molecular weight (Mw) of 1.5 million was confirmed.

[0132] 2. Preparation of adhesive composition

[0133] For 100 parts by mass (in terms of solid content) of the polymer (A) obtained in the above step (1), a polyrotaxane ...

Embodiment 2-21

[0148] [Example 2-21, Comparative Example 1]

[0149] Except that the types and amounts of monomers constituting the adhesive composition, the types and amounts of polyrotaxane compounds, crosslinking agents, chelating compounds, and silane coupling agents were changed as shown in Table 1, it was the same as in Example 1. , to manufacture a polarizer having an adhesive layer.

[0150] Here, the above-mentioned weight average molecular weight (Mw) is a polystyrene-equivalent weight average molecular weight measured by gel permeation chromatography (GPC) under the following conditions (GPC measurement).

[0151]

[0152] ・GPC measurement device: HLC-8020, manufactured by Tosoh Co., Ltd.

[0153] · GPC column (passed in the following order): manufactured by Tosoh Corporation

[0154] TSK guard column HXL-H

[0155] TSK gel GMHXL (×2)

[0156] TSK gel G2000HXL

[0157] ·Measurement solvent: tetrahydrofuran

[0158] ·Measurement temperature: 40℃

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Abstract

PROBLEM TO BE SOLVED: To provide a low-haze self-adhesive composition, a self-adhesive, and a self-adhesive sheet, excellent in both of light leakproofness and durability when applied to optical members including polarizing plates.SOLUTION: A self-adhesive composition comprises: (A) a (meth)acrylic ester polymer with a weight-average molecular weight of 300,000 to 2,500,000 containing a hydroxyl-bearing monomer as monomer unit constituting the polymer; (B) a polyrotaxane compound having, as cyclic molecule, a cyclic oligosaccharide containing a hydroxy group as reactive group; (C) an isocyanate group-containing crosslinking agent; and (D) a chelating compound.

Description

technical field [0001] The present invention relates to an adhesive composition, an adhesive (a material in which the adhesive composition is crosslinked), and an adhesive sheet, and in particular, relates to an adhesive composition, an adhesive, and an adhesive sheet suitable for optical components such as polarizers . Background technique [0002] Generally, in a liquid crystal panel, an adhesive layer formed from an adhesive composition is often used to adhere 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, and the adhesive layer laminated on the optical component cannot follow the shrinkage due to thermal changes, and peeling (so-called floating) occurs at the interface. , stripped). There is also a problem of light leakage (so-called white spot) caused by deviation of the optical axis of the optical member due to the s...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09J133/08C09J11/08C09J11/06C08J3/24C09J7/02
CPCC09J175/04C09J2203/318C09J7/22C09J7/38C09J7/385C09J2301/124C09J2301/302G02B5/3025G02B5/305
Inventor 荒井隆行又野仁所司悟
Owner LINTEC CORP