Optical-use pressure-sensitive adhesive sheet

An adhesive sheet, optical technology, applied in the direction of optics, adhesive type, ester copolymer adhesive, etc., can solve the problem of peeling off the display and touch panel or lens, and achieve excellent twist adhesion and reliable adhesion sex enhancing effect

Active Publication Date: 2011-05-11
NITTO DENKO CORP
View PDF8 Cites 28 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Along with this, for example, when sitting down with a cell phone in a trouser pocket, etc., bending, twisting, or twisting stress (stress in the bending direction or twisting direction, etc.) is applied to the display, etc. Delamination of the touch panel or lens

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Optical-use pressure-sensitive adhesive sheet
  • Optical-use pressure-sensitive adhesive sheet
  • Optical-use pressure-sensitive adhesive sheet

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0102] When preparing the above-mentioned acrylic polymer, a polymerization initiator such as a thermal polymerization initiator or a photopolymerization initiator (photoinitiator) can be used depending on the type of polymerization reaction. The polymerization initiators may be used alone or in combination of two or more.

[0103] As the photopolymerization initiator, there is no particular limitation, and for example, benzoin ether photopolymerization initiators, acetophenone photopolymerization initiators, α-keto alcohol photopolymerization initiators, aromatic sulfonyl chloride photopolymerization initiators, and aromatic sulfonyl chloride photopolymerization initiators can be used. Polymerization initiators, photoactive oxime photopolymerization initiators, benzoin photopolymerization initiators, benzil photopolymerization initiators, benzophenone photopolymerization initiators, ketal photopolymerization initiators, thiazolin photopolymerization initiators xanthone-based ...

Embodiment 1

[0133] In a mixture of 70 parts by weight of 2-ethylhexyl acrylate (2EHA), 26 parts by weight of N-vinyl-2-pyrrolidone (NVP) and 4 parts by weight of N-hydroxyethylacrylamide (HEAA), Cooperate with 0.05 parts by weight of the trade name "Irgacure 184" manufactured by Ciba Specialty Chemical Co., Ltd. and 0.05 part by weight of the trade name "Irgacure 651" manufactured by Ciba Specialty Chemical Company as a photopolymerization initiator, and then irradiate ultraviolet light until the viscosity (BH type viscometer , No. 5 rotor, 10 rpm, measuring temperature 30° C.) was about 20 Pa·s, thereby producing a prepolymer composition in which the above-mentioned monomer components were partially polymerized.

[0134]0.05 parts by weight of an isocyanate-based crosslinking agent (manufactured by Nippon Polyurethane Industry Co., Ltd., trade name "Coronet L") was added to 100 parts by weight of the above-mentioned prepolymer composition to prepare an acrylic adhesive. Composition for l...

Embodiment 2

[0139] As shown in Table 1, except that the addition amount of Coronet L and the thickness of the pressure-sensitive adhesive layer were changed, a prepolymer composition, a composition for forming an acrylic pressure-sensitive adhesive layer, and Double-sided adhesive sheet (double-sided adhesive sheet without substrate).

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

PropertyMeasurementUnit
peel strengthaaaaaaaaaa
thicknessaaaaaaaaaa
storage modulusaaaaaaaaaa
Login to view more

Abstract

The invention provides an optical-use adhesive sheet excellent in adhesiveness under bending, twisting or distorting stress. The optical-use adhesive sheet has an adhesive layer having a storage elastic modulus at 80 DEG C of at least 2.0X10 4 Pa and a loss elastic modulus at 80 DEG C of at least 1.0X10 4 Pa, the optical-use adhesive sheet is characterized in that the adhesive sheet has a peel force, as measured in the L-shape peel test, of at least 0.16 MPa, and has a peel distance, as measured in the constant-load peel test, of at most 50 mm. In the L-shape peel test, an L-shaped stainless steel clamp is adhered with an acrylicresin plate through the adhesive sheet, the acrylicresin plate and the stainless steel clamp are processed for 15 minutes at 50 DEG C under 5 atm, and then, the stainless steel clamp is drawn along a direction vertical to a surface of the acrylicresin plate so as to test the peel force. In the constant-load peel test, a double-faced adhesive sheet is adhered on the acrylicresin plate, then, the acrylicresin plate and the double-faced adhesive sheet are processed for 10 minutes at 50 DEG C under 5 atm, and then, a load of 100gf is applied along the direction vertical to the surface of the acrylicresin plate on a tail end in a length direction of the adhesive sheet so as to test the peel distance of the adhesive sheet after 3 hours.

Description

technical field [0001] The present invention relates to an adhesive sheet used for bonding optical members. 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 come to be widely used in various fields. In the manufacture of these display devices or input devices, transparent adhesive sheets are used for bonding optical members. For example, a transparent double-sided pressure-sensitive adhesive sheet is used for bonding a touch panel, a lens, or the like to a liquid crystal display device (liquid crystal display, etc.) (for example, refer to Patent Documents 1 to 3). [0003] In recent years, the above-mentioned display devices and input devices have also been widely used in small portable devices such as mobile phones and portable data terminals (PDAs). Along with this, for example, when sitting down with a cell phone in a trouser po...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
Patent Type & Authority Applications(China)
IPC IPC(8): C09J7/00C09J7/02C09J133/08C09J133/10C09J7/10
CPCC09J131/04C09J133/02C09J133/04C09J133/06C09J133/08C09J2433/00G02F2202/28C09J7/10Y10T428/2891Y10T428/2809Y10T428/28C09J2203/318C09J2301/416C09J2301/312C09J2301/302C09J7/385C09J7/22C09J7/40B05D5/10C09J9/00
Inventor 宝田翔野中崇弘马场纪秀
Owner NITTO DENKO CORP
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap