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Optical film with adhesive and image display device

An image display device, optical film technology, applied in the direction of adhesive type, ester copolymer adhesive, film/sheet adhesive, etc., can solve the problem of easy trapping of air bubbles, etc. Excellent level difference absorption, suppressing display unevenness

Active Publication Date: 2016-08-24
NITTO DENKO CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

On the other hand, when the adhesive is soft, air bubbles tend to remain at the interface between the front transparent member and the adhesive sheet.

Method used

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  • Optical film with adhesive and image display device
  • Optical film with adhesive and image display device
  • Optical film with adhesive and image display device

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0119] When preparing an acrylic polymer, depending on the type of polymerization reaction, a polymerization initiator such as a photopolymerization initiator or a thermal polymerization initiator can be used. The photopolymerization initiator is not particularly limited as long as it initiates photopolymerization. For example, benzoin ether-based photopolymerization initiators, acetophenone-based photopolymerization initiators, and α-keto alcohol-based photopolymerization initiators can be used. , Aromatic sulfonyl chloride photopolymerization initiators, photoactive oxime photopolymerization initiators, benzoin photopolymerization initiators, biphenylyl photopolymerization initiators, benzophenone photopolymerization initiators, ketals Photopolymerization initiators, thioxanthone photopolymerization initiators, acylphosphine oxide photopolymerization initiators, etc. As the thermal polymerization initiator, for example, an azo-based initiator, a peroxide-based initiator, a r...

Embodiment 1

[0228] A polarizing plate having transparent protective films on both sides of a polarizer comprising a stretched polyvinyl alcohol film with a thickness of 25 μm impregnated with iodine was used as an optical film. The above-mentioned cell-side pressure-sensitive adhesive sheet was bonded to one surface (cell-side surface) of the polarizer using a roll laminator. Then, the above-mentioned pressure-sensitive adhesive sheet A was bonded to the other surface (visible side surface) of the polarizing plate using a roll laminator. Furthermore, the above-mentioned PSA sheet E was laminated on the PSA sheet A using a roll laminator. By doing so, a laminated adhesive sheet having a cell-side adhesive sheet on one side of a polarizing plate, an adhesive sheet A and an adhesive sheet E on the other side of a polarizing plate, and a unit-side adhesive sheet were obtained. A polarizing plate with an adhesive on both sides of a protective film was temporarily pasted on the front surface a...

Embodiment 2～7、 comparative example 1

[0230] A polarizing plate with an adhesive on both sides was obtained in the same manner as in Example 1 above except that the configuration of the adhesive sheet bonded to the visible side of the polarizing plate was changed as shown in Table 2.

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Abstract

The invention relates to an optical film with an adhesive and an image display device. The invention provides an adhesive sheet which is free from the retention of released gas during the bonding with a front transparent plate and which can suppress the display unevenness of the image display device, and an optical film with the adhesive having the adhesive sheet. The optical film (53) with the adhesive has a front-side adhesive sheet (20) on a side of an optical film (10). The front-side adhesive sheet (20) is a laminated adhesive sheet including a first adhesive layer (21) and a second adhesive layer (22). The first adhesive layer (21) has a storage elastic modulus of 9x103 Pa or less at 150 DEG C, and a ratio G'20 / G'150 of 20 or more, where G'20 is a storage elastic modulus at 20 DEG C and G'150 is a storage elastic modulus at 150 DEG C. The second adhesive layer (22) has a storage elastic modulus of 4x105 Pa or less at 20 DEG C, and a storage elastic modulus of 1x104 Pa or more at 150 DEG C.

Description

technical field [0001] The present invention relates to an adhesive sheet and an adhesive-attached optical film used for forming an image display device having a transparent plate or a touch panel on the front of an image display panel. In addition, the present invention relates to an image display device using the pressure-sensitive adhesive sheet or the optical film with the pressure-sensitive adhesive. Background technique [0002] Liquid crystal display devices and organic electroluminescence display devices are widely used as various image display devices such as mobile phones, car navigation devices, computer monitors, and televisions. In order to prevent breakage of the image display panel due to impact from the outer surface, a front transparent plate (also called a "window layer"), such as a transparent resin plate or glass plate, may be provided on the visible side of the image display panel. In addition, in recent years, devices having a touch panel on the visibl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09J7/02C09J133/08B32B7/10B32B33/00G02B5/30G02F1/1335B32B7/022
CPCC09J7/385C09J7/255B32B7/10B32B33/00C09J133/08G02B5/30G02F1/133528C09J2483/005C09J2433/00C09J2203/326B32B7/022B32B7/06B32B7/12B32B27/308B32B27/32B32B27/36C09D123/06B32B2250/24B32B2255/10B32B2255/26B32B2270/00B32B2307/4026B32B2307/42B32B2307/51B32B2307/514B32B2307/7145B32B2307/732B32B2307/748B32B2457/00B32B2457/208B32B2551/00G02B5/3025B32B27/08C09J2203/318C09J2301/208
Inventor 宝田翔水谷昌纪保井淳山本真也
Owner NITTO DENKO CORP
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