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Optical Adhesive Sheet

An adhesive sheet, optical technology, applied in the direction of adhesive type, ester copolymer adhesive, film/sheet adhesive, etc., can solve problems such as misoperation and achieve the effect of preventing misoperation

Active Publication Date: 2012-11-28
NITTO DENKO CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For electrostatic capacitive touch panels, if the value of the electrostatic capacitance cannot be kept at a constant value stably, it will cause misoperation

Method used

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  • Optical Adhesive Sheet
  • Optical Adhesive Sheet

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0097] (Preparation of photopolymerizable composition)

[0098] 40 parts by weight of 2-ethylhexyl acrylate, 59 parts by weight of 2-methoxyethyl acrylate, 1 part by weight of 4-hydroxybutyl acrylate, 0.05 parts by weight of 2,2-dimethoxy-1 , 2-diphenyl-1-ketone (trade name "Irugakuyua 651", manufactured by Ciba Corporation of Japan) and 0.05 parts by weight of 1-hydroxycyclohexyl-phenyl ketone (trade name "Irugakuyua 184", manufactured by Ciba Corporation of Japan ) into a four-necked flask, and carried out partial photopolymerization by exposing to ultraviolet rays under a nitrogen atmosphere, thereby obtaining a partial polymer (monomer slurry) with a polymerization rate of 10%.

[0099] After adding 0.1 part by weight of an isocyanate compound (trade name "Corone-to L", manufactured by Nippon Polyurethane Industry Co., Ltd., solid content ratio: 75% by weight) in terms of solid content to 100 parts by weight of this part of the polymer, it was uniformly mixed. Mix to prep...

Embodiment 2

[0103] (Preparation of photopolymerizable composition)

[0104] 69 parts by weight of 2-ethylhexyl acrylate, 30 parts by weight of 2-methoxyethyl acrylate, 1 part by weight of 4-hydroxybutyl acrylate, 3 parts by weight of acrylic acid, 0.05 parts by weight of 2,2-di Methoxy-1,2-diphenyl-1-one (trade name "Irugakuyua 651", manufactured by Ciba Corporation of Japan) and 0.05 parts by weight of 1-hydroxycyclohexyl-phenyl ketone (trade name "Irugakuyua 184", (manufactured by Ciba Co., Ltd. Japan) was charged into a four-necked flask, and subjected to partial photopolymerization by exposure to ultraviolet rays under a nitrogen atmosphere, thereby obtaining a partial polymer (monomer slurry) with a polymerization rate of 10%.

[0105] After adding 0.01 weight part of trimethylolpropane triacrylate to 100 weight part of this partial polymer, this was mixed uniformly, and the photopolymerizable composition was prepared.

[0106] (production of adhesive sheet)

[0107] On the release...

Embodiment 3

[0109] (Preparation of photopolymerizable composition)

[0110] 68 parts by weight of 2-ethylhexyl acrylate, 24 parts by weight of 2-methoxyethyl acrylate, 6 parts by weight of N-vinylpyrrolidone, 2 parts by weight of hydroxyethylacrylamide, 0.05 parts by weight of 2,2 - Dimethoxy-1,2-diphenyl-1-ketone (trade name "Irugakuyua 651", manufactured by Ciba Corporation of Japan) and 0.05 parts by weight of 1-hydroxycyclohexyl-phenylketone (tradename "Irugakuyua 184" ", manufactured by Ciba Corporation of Japan) was added in a four-necked flask, and carried out partial photopolymerization by being exposed to ultraviolet rays under a nitrogen atmosphere, thereby obtaining a partial polymer (monomer slurry) with a polymerization rate of 10%.

[0111] After adding 0.015 weight part of trimethylolpropane triacrylates to 100 weight part of polymers of this part, this was mixed uniformly, and the photopolymerizable composition was prepared.

[0112] (production of adhesive sheet)

[0113]...

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Abstract

Disclosed is an optical adhesive sheet which can suppress malfunction-causing changes in capacitance when said sheet is applied to an optical member. The optical adhesive sheet includes an adhesive layer and is characterised by having a dielectric constant of 2-8 at a frequency of1MHz and a dielectric loss tangent which is greater than 0 but not greater than 0.2 at a frequency of 1 MHz. In addition, at a frequency of 1.0 x 106 Hz, the dielectric constant of said sheet is preferably not less than 60% of the dielectric constant at a frequency of 1.0 x 104 Hz, and the absolute value of the difference between the dielectric loss tangent at a frequency of 1.0 x 106 Hz and that at a frequency of 1.0 x 104 Hz is preferably not greater than 0.15.

Description

technical field [0001] The present invention relates to an optical pressure-sensitive adhesive sheet. Background technique [0002] In recent years, display devices such as liquid crystal displays (LCDs) and input devices used in combination with the display devices, such as touch panels, have been widely used in various fields. In the manufacture of these display devices or input devices, etc., an adhesive sheet for bonding optical members is used (for example, refer to Patent Document 1). [0003] As a trend of image display methods, a touch panel image display method has attracted sufficient attention, and in particular, an electrostatic capacitive touch panel has been popularized. In such a capacitive touch panel, not only an adhesive layer (a layer formed of an adhesive) is used for bonding the transparent member, but the adhesive layer is also used as an insulating layer. Regarding the capacitive touch panel, when the touch panel is touched with a finger or the like,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09J7/02C09J133/00G06F3/044C09J7/10
CPCC09J133/08G06F3/044C09J2203/318C09J7/00C09J133/066C09J7/0217C09J2433/00C09J133/14C09J7/385C09J7/10Y10T428/28Y10T428/2891Y10T428/24479C09K2323/05C09K2323/057B32B2457/202B32B2457/208
Inventor 马场纪秀岸冈宏昭野中崇弘夏井正赖麓弘明宝田翔铃木孝
Owner NITTO DENKO CORP
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