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Optical adhesive, optical adhesive and display apparatus comprising the same

A technology of optical adhesives and optical components, applied in the direction of optical components, adhesive types, ester copolymer adhesives, etc., can solve the problems of degraded display device usability, ITO film corrosion, etc.

Active Publication Date: 2013-06-05
CHEIL IND INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the optical adhesive used to couple the polarizing plate and the ITO film causes corrosion of the ITO film, thereby deteriorating the usability of the display device

Method used

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  • Optical adhesive, optical adhesive and display apparatus comprising the same
  • Optical adhesive, optical adhesive and display apparatus comprising the same
  • Optical adhesive, optical adhesive and display apparatus comprising the same

Examples

Experimental program
Comparison scheme
Effect test

preparation example 1

[0080] Preparation Example 1: Preparation of (meth)acrylic acid copolymer

[0081] 59 parts by weight of butyl acrylate (BA), 10 parts by weight of methyl acrylate (MA), 0.5 parts by weight of 2-hydroxyethyl acrylate (2-HEMA), 30 parts by weight of phenoxymethacrylate (PMA ) and 0.5 parts by weight of acrylic acid (AA) and 10 parts by weight of ethyl acetate (EA) as a solvent were put together in a 1 L 4-necked flask and kept at 65°C. 0.03 parts by weight of azobisisobutyronitrile diluted with ethyl acetate in a ratio of 50% was added to the mixture as an initiator. A (meth)acrylic copolymer was prepared by reacting at 65°C for 5 hours. During the reaction, nitrogen gas was supplied into the flask at 10 cc / min. The refractive index of the prepared (meth)acrylic copolymer can be measured by a typical method of measuring the refractive index of a film with an Abbe refractometer. The acid value of the prepared (meth)acrylic copolymer was measured according to JIS K0070 (1992 e...

preparation example 2 to 5

[0082] Preparation Examples 2 to 5: Preparation of (meth)acrylic acid copolymer

[0083] A (meth)acrylic copolymer was prepared in the same manner as in Preparation Example 1 except for the contents of individual components (unit: parts by weight).

[0084] Table 1

[0085]

[0086]

[0087] Details of the components used in Examples and Comparative Examples are as follows.

[0088] (1) (meth)acrylic acid copolymer: (meth)acrylic acid copolymer prepared by embodiment 1 to 5

[0089] (2) Curing agent 1: Trimethylolpropane modified toluene diisocyanate (Coronate-L, Nippon Polyurethane)

[0090] Curing agent 2: epoxy resin crosslinking agent (TETRAD-C, Mitsubishigano)

[0091] (3) Silane coupling agent: 3-glycidyloxypropyltrimethoxysilane (KBM-403, Shin-Etsu Chemical)

Embodiment 1 to 3 and comparative example 1 to 2

[0092] Examples 1 to 3 and Comparative Examples 1 to 2: Preparation of Optical Adhesives

[0093] Each optical adhesive was prepared by mixing the components (unit: parts by weight) listed in Table 2 excluding the solvent, and then stirring the mixture for 1 hour.

[0094] Table 2

[0095]

[0096] The properties of each prepared optical adhesive were evaluated as follows, and the results are shown in Table 3.

[0097] (1) Corrosion property: The prepared adhesive is coated on a polarizing plate to a thickness of 20 to 30 μm. Then, the coated adhesive layer was cured at 35°C for 5 days, and two ITO films were stacked on the opposite upper side of the cured adhesive layer, thereby providing figure 2 Samples shown. The sample of the cured adhesive layer stacked on the polarizing plate has a total length Y of 7 cm, each of the ITO films stacked on the opposite upper side of the cured adhesive layer has a length X of 1 cm, and for surface resistance The measured length Z i...

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Abstract

An optical member, an optical adhesive, and a display apparatus, the optical member including a transparent conductive film; an optical adhesive layer on the transparent conductive film; and a polarizer plate stacked on the optical adhesive layer, wherein a surface resistance difference Rs2-Rs1 of a specimen including the optical adhesive layer is less than about 0.2[Omega], the specimen being prepared by manufacturing the polarizer plate having the optical adhesive layer thereon and stacking two transparent conductive films on opposite upper sides of the optical adhesive layer, where Rs1 is an initial surface resistance of the specimen and Rs2 is a surface resistance of the specimen kept at 70 DEG C and 95 % RH for 48 hours.

Description

technical field [0001] The present invention relates to an optical element and a display device including the same. Background technique [0002] A display device including a liquid crystal display having a polarizing plate and a retardation film stacked thereon is easily deformed in an external environment. In particular, display devices can suffer from light leakage when exposed to light. It is known that light leakage occurs due to optical anisotropy caused by shrinkage of a polarizing film stretched under high temperature and high humidity conditions. [0003] As a method of preventing light leakage, the modulus of the optical adhesive is controlled to adjust the pressure. However, this method has limitations in preventing light leakage. In particular, conventional techniques do not allow for consistent measurement results in failure testing because it can vary depending on the viewing angle, causing processing difficulties when applying optical adhesives due to the d...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B5/30G02F1/1335B32B7/12C09J133/08C09J133/14C09J11/06C09J7/02
CPCG02B5/30C09J133/12C09J133/06G02B5/3033C09K2323/05C09K2323/057C09J7/00C09J133/04C09J2203/318G02F1/1335
Inventor 郑宇镇猪股香织金易宇徐有珍
Owner CHEIL IND INC