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Adhesive

An adhesive and adhesive layer technology, applied in the direction of adhesives, film/sheet adhesives, non-polymer adhesive additives, etc., can solve the problems of uneven distribution of residual stress, easy curling and peeling, etc. Residues and cloudiness of adhesive, excellent reworkability, and effect of reducing stress concentration

Active Publication Date: 2010-12-08
SUMITOMO CHEM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The optical film with the adhesive, due to the large dimensional change caused by expansion and contraction under hot or humid heat conditions, is prone to curling, etc., and there is foaming in the adhesive layer of the obtained optical laminate, or the adhesive layer Problems such as arching and peeling between the glass substrate and the glass substrate
Further, the distribution of residual stress acting on the optical film with the adhesive under heat or humid heat conditions is not uniform, and stress concentration occurs in the outer peripheral portion of the optical laminate, thereby causing whitening in the TN liquid crystal cell (TFT). ;The problem of color inhomogeneity in STN liquid crystal cell

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0107] Hereinafter, the present invention will be described more specifically with reference to examples. In addition, "part" and "%" in an Example mean a basis of weight unless otherwise specified. In addition, the non-volatile matter is measured by the measuring method based on JISK-5407. Specifically, an arbitrary weight of the adhesive solution was taken in a dish, and the ratio of the weight of the remaining non-volatile components after drying in an explosion-proof oven at 115° C. for 2 hours to the weight of the initially measured solution was expressed. The weight-average molecular weight is measured by using a device converted to standard polystyrene. When the sample concentration is 5 mg / ml and the sample introduction volume is 100 μml, Tosoh Co., Ltd.: TSKgel G6000H is used. XL 2 sticks, TSKgelG5000H XL Two columns connected in series are used as a chromatographic column, under the conditions of a temperature of 40°C and a flow rate of 1ml / min, using tetrahydrofur...

manufacture example

[0109] (polymerization example 1)

[0110] Add 222 parts of ethyl acetate to the reactor with cooling pipe, nitrogen inlet pipe, thermometer and stirrer, replace the air in the device with nitrogen, and raise the inner temperature to 75°C after oxygen is freed. After adding the whole amount of a solution obtained by dissolving 0.5 part of azobisisobutyronitrile (hereinafter referred to as AIBN) in 12.5 parts of ethyl acetate, the internal temperature was maintained at 74°C to 76°C, and within 3 hours, the single A mixed solution of 36 parts of butyl acrylate, 44 parts of butyl methacrylate and 20 parts of methyl acrylate of body (a) was dropped in the reaction system. Then, the inner temperature was kept at 74° C. to 76° C. for 5 hours to complete the reaction. The polystyrene-equivalent weight average molecular weight of GPC was 100,000.

[0111] (polymerization examples 2 to 5)

[0112] With the monomer composition shown in Table 1, the reaction was basically carried out ...

Embodiment 1

[0125]

[0126] The acrylic resins (1) and (2) were mixed in the weight ratio shown in Table 3 to obtain an ethyl acetate solution of the acrylic resin composition. In 100 parts of non-volatile components of the obtained solution, 2 parts (non-volatile components) of an adduct of toluene diisocyanate (trade name: Coronet L, manufactured by Nippon Polyurethane Industry Co., Ltd.) as a crosslinking agent, a silane compound ( Trade name: Y11597, manufactured by Dow Corning Toray) 0.1 part to obtain the adhesive of the present invention.

[0127]

[0128] The thus-obtained adhesive was coated on a mold-releasing polyethylene terephthalate film (manufactured by Lintec Co., Ltd., trade name: PET3811) using a coater so that the thickness after drying was 25 μm. The treated surface was dried at 90° C. for 1 minute to obtain a sheet-like adhesive. Then, a polarizing film (a film having a three-layer structure on both sides of a film obtained by absorbing iodine to polyvinyl alcoho...

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Abstract

Provided is an adhesive which does not generate appearance changes at optical laminated body and has excellent durability in the condition of high temperature and humidity and repeatedly heating and cooling containing acrylic resin (1) and (2), wherein the relationship between THF insoluble component X(%) of the adhesive and Y(%) represented by formula III satisfies formula I and II: 40 <= X <= 70 (I), -0.51X +41 < 0.45X + 24 (II), Y = B - (100 - X) * C / 100 (III), wherein B is a weight percentage of the component, which has a molecular weight of no less than 300000, of the mixture of (1) and (2), and C is a weight percentage of the component, which has a molecular weight of no less than 300000, of the THF insoluble component, and (1) is the acrylic resin having a weight-average molecular weight of from 50000 to 250000, (2) is the acrylic resin containing (b) having a weight-average molecular weight of from 1000000 to 1500000, and (b) is the monomer with polar functional groups and alkene double bond.

Description

technical field [0001] The present invention relates to an adhesive and an optical laminate containing the adhesive. Background technique [0002] Generally, liquid crystal cells used in liquid crystal display devices such as TFT and STN have a structure in which liquid crystal components are sandwiched between two glass substrates. Further, on the surface of the glass substrate, an optical film such as a polarizing film or a retardation film is laminated via an adhesive mainly composed of an acrylic resin. In addition, an optical laminate formed by sequentially laminating a glass substrate, an adhesive, and an optical film generally uses an optical film with an adhesive obtained by laminating an adhesive on the optical film, and then laminating glass on the surface of the adhesive. Substrate method. [0003] The optical film with the adhesive, due to the large dimensional change caused by expansion and contraction under hot or humid heat conditions, is prone to curling, e...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09J133/00C08K5/29G02B1/00B32B37/12
CPCB32B17/08C09J7/22C09J11/06C09J133/062C09J2401/006
Inventor 杉原昌子竹厚流河村晃
Owner SUMITOMO CHEM CO LTD
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