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Liquid optically clear photo-curable adhesive for display application

An optically transparent, adhesive technology, applied in non-polymer organic compound adhesives, adhesive types, polyurea/polyurethane adhesives, etc., can solve occupational health and safety, environmental problems, time-consuming And other issues

Inactive Publication Date: 2015-07-29
HENKEL KGAA +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] A significant challenge with this type of optical assembly is how to rework LCDs or other expensive components after lamination is complete but defects are found
Cleaning off residues with organic solvents is not only time consuming but also has serious environmental concerns and also affects occupational health and safety

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0053] Sample preparation:

[0054] Samples were prepared by dropping the adhesive composition onto a PET film with a release agent (e.g., coated with polysiloxane release agent) to a given thickness (0.6 mm) and using UV light The resin composition is irradiated and cured, and then the fully cured sample is cut into a given size: 0.6mm*10mm*50-60mm.

[0055] Elongation testing is preferably performed with Instron equipment (Instron Universal Tester):

[0056] The size used for testing: 0.6mm*10mm*30mm (20-30mm is used for fixture)

[0057] Load capacity: 1KN

[0058] Speed: 300mm / min

[0059] Particularly low hardness, shrinkage and elastic modulus values ​​can be achieved with the adhesive composition of the present invention, said adhesive composition comprising:

[0060] (a) 30-45% by weight of polyurethane acrylate,

[0061] (b) 35-50% by weight of plasticizer,

[0062] (c) 0.02-3.5% by weight, preferably 1-3.5% by weight, especially 1-2% by weight of photoinitiator...

Embodiment

[0137] The following liquid optically clear photocurable adhesives were prepared by mixing all ingredients to obtain a homogeneous mixture protected from light.

[0138] UV-3610ID80 39.5%

[0139] (Urethane acrylate oligomer available from Nippon Gohsei,

[0140] diluted in 20% isodecyl acrylate)

[0141] Lauryl Acrylate 18.8%

[0142] Triethylene glycol bis(2-ethylhexanoate) 20.5%

[0143] GI-2000 20%

[0144] (1,2-polybutadiene homopolymer; number average

[0145] Molecular weight: 2100; purchased from Nippon Soda, Tokyo, Japan)

[0146] Speedcure TPO 0.3% by weight

[0147] (2,4,6-Trimethylbenzoyldiphenylphosphine oxide)

[0148] Irgacure 184D 0.9% by weight

[0149] (1-Hydroxycyclohexylphenylketone)

[0150] This liquid optically clear photocurable adhesive is used in a method of making an optical assembly (as example a) comprising:

[0151] (a) provide display panels and covers,

[0152] (b) disposing said liquid optically clear photocurable adhesive on said di...

Embodiment a

[0164] (a) detaching the cover from the display panel by heating the assembly to about 90°C and removing the cover;

[0165] (b) After disassembling the cover plate, cool the disassembled parts to room temperature (25°C);

[0166] (c) Peeling off the remaining adhesive film from the cover sheet.

[0167] The adhesive film can be easily removed from the cover without leaving any residue on the optical assembly at all. The adhesive film was peeled off as just one single sheet.

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Abstract

Liquid optically clear photo-curable adhesive for display application A process for reworking an optical assembly and a liquid optically clear photo-curable adhesive, which comprises: (a) 10 to 50 wt % of an urethane acrylate, (b) 30 to 70 wt % of plasticizer, (c) 0.002 to 5 wt % of photo initiator, (d) 1 to 30 wt % of acrylate monomer are described.

Description

technical field [0001] The present invention relates to certain liquid optically clear photocurable adhesives and several uses of the adhesives. The invention also relates to bonding substrates with liquid optically clear photocurable adhesives, and the invention also relates to optical assemblies comprising such optically clear adhesives. Furthermore, the invention relates to a method for reworking an optical assembly. Background technique [0002] Optically clear adhesives, especially liquid optically clear adhesives, are widely used in optical displays. In display applications, optical bonding is used to bond optical components such as display panels, glass panels, touch panels, diffusers, rigid compensators, heaters and flexible films such as polarizers and retarders. In particular there is great interest in using such adhesives for bonding in touch displays, such as capacitive touch displays. The importance of optically clear adhesives is still growing as the continu...

Claims

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Application Information

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IPC IPC(8): C09J4/02C09J175/16B32B7/12
CPCB32B37/06C09J175/16B32B37/1284C09J11/08C09J4/00B32B38/10B32B43/006Y10T156/1153B32B7/12C09J4/06
Inventor 袁寅啸吕道强
Owner HENKEL KGAA
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