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Adhesive layer for optical member, optical member with adhesive layer, and image display device

A technology for adhesive layers and optical components, applied in the direction of polymer adhesive additives, adhesive types, adhesive additives, etc., can solve problems such as poor bonding of optical components, wrinkles or deformation, and display defects

Active Publication Date: 2020-11-13
NITTO DENKO CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When the optical members that have been increased in size and thinned in this way are fixed and laminated with an adhesive, bonding failures (wrinkles, deformation, etc.) are likely to occur on the optical members, and as a result, defects in the display part may occur.

Method used

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  • Adhesive layer for optical member, optical member with adhesive layer, and image display device
  • Adhesive layer for optical member, optical member with adhesive layer, and image display device
  • Adhesive layer for optical member, optical member with adhesive layer, and image display device

Examples

Experimental program
Comparison scheme
Effect test

manufacture example 1

[0133] Production example 1 (production of light-diffusing adhesive composition (A-1))

[0134]70 parts of 2-ethylhexyl acrylate (2EHA), N-vinyl-2-pyrrolidone (NVP ) 15 parts and 2-hydroxyethyl acrylate (HEA) 15 parts, photopolymerization initiator (trade name: Irgacure 184, manufactured by BASF Corporation) 0.1 part, then irradiate ultraviolet light until the viscosity (measurement condition: BH viscometer No.5 Rotor, 10 rpm, measurement temperature 30° C.) was about 20 Pa·s, and a prepolymer composition in which a part of the above-mentioned monomer components had been polymerized was obtained.

[0135] Next, with respect to 100 parts of the obtained prepolymer composition, 0.2 parts of isocyanate crosslinking agent (trade name: Coronate L, toluene diisocyanate adduct of trimethylolpropane, manufactured by Nippon Polyurethane Industry Co., Ltd.) was mixed. , thereby obtaining the base adhesive composition (A-1). The refractive index of the obtained base adhesive compositio...

manufacture example 2～5

[0137] Production examples 2 to 5 (production of light-diffusing adhesive compositions (A-2) to (A-5))

[0138] In Production Example 1, the addition amount of light-diffusing fine particles was changed as shown in Table 1, and light-diffusing adhesive compositions (A-2) to (A- 5).

manufacture example 6

[0139] Production example 6 (production of light-diffusing adhesive composition (A-6))

[0140] Put 100 parts of butyl acrylate, 5 parts of acrylic acid, 1 part of hydroxyethyl acrylate, 0.1 part of 2,2'-azobisisobutyronitrile as a polymerization initiator, and 100 parts of ethyl acetate together with a stirring blade, a thermometer, In a four-neck flask (concentration of the monomer is 50%) of a nitrogen introduction tube and a condenser, introduce nitrogen while stirring slowly to carry out nitrogen replacement, and then keep the liquid temperature in the flask at about 55° C. for 8 The polymerization reaction was carried out for several hours to prepare a solution of an acrylic polymer (A-6) having a weight average molecular weight (Mw) of 1,800,000.

[0141] With respect to 100 parts of solid content of the acrylic polymer (A-6) solution obtained above, 0.66 parts of isocyanate crosslinking agent (trade name: Coronate L, trimethylolpropane / toluene diisocyanate trimer addit...

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Abstract

The object of this invention is to provide the pressure-sensitive adhesive layer for optical members which can bond the various optical members which enlarged and thinned, and the optical member which has a level difference, and which has a light-diffusion function. In addition, the object of the present invention is to provide an optical member with an adhesive layer having at least one layer of the above-mentioned adhesive layer for an optical member on at least one surface of the optical member, and an optical member including the above-mentioned optical member with an adhesive layer. image display device. An adhesive layer for an optical member, characterized in that the adhesive layer for an optical member comprises at least one light-diffusing adhesive layer, and the light-diffusing adhesive layer is composed of (meth)acrylic acid The polymer base adhesive composition and light-diffusing fine particles are formed and have a thickness of 5 μm to 300 μm, and the entire adhesive layer for optical members has a thickness of 20 μm or more and a haze of 10% to 96%.

Description

technical field [0001] This invention relates to the adhesive layer for optical members which has a light-diffusion function, and the optical member with an adhesive layer which has at least one said adhesive layer for optical members on at least one surface of an optical member. Moreover, this invention relates to the image display apparatus containing the said optical member with an adhesive layer. Background technique [0002] In recent years, image display devices such as liquid crystal display devices have been required to increase in size and thickness, and each optical member constituting the image display device is also required to do the same. When the optical members thus increased in size and thinned in thickness are fixed and laminated with an adhesive, poor bonding (wrinkle, deformation, etc.) tends to occur on the optical members, and as a result, defects in the display part may occur. [0003] In addition, generally, in order to improve visibility, a diffusio...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09J133/04C09J7/10C09J11/08C09J133/06G02B5/02
CPCC09J11/08C09J133/04C09J133/06G02B5/02C09J7/10C09J7/00
Inventor 保井淳宝田翔泽崎良平山本真也
Owner NITTO DENKO CORP
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