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Solvent-free adhesive composition, adhesive sheet and display body

A display body and adhesive technology, applied in the direction of adhesive types, adhesives, adhesive additives, etc., can solve the problems of light reflection loss, etc., and achieve excellent step followability and excellent anti-foaming effect

Pending Publication Date: 2019-03-05
LINTEC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, on the display module side of the protective panel, there may be a frame-shaped printed layer as a step difference.
If the adhesive layer does not follow the level difference, the adhesive layer will float near the level difference, resulting in light reflection loss

Method used

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  • Solvent-free adhesive composition, adhesive sheet and display body
  • Solvent-free adhesive composition, adhesive sheet and display body
  • Solvent-free adhesive composition, adhesive sheet and display body

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0088] 2. Preparation of solvent-free adhesive composition

[0089] The solvent-free adhesive composition P can be prepared by mixing the active energy ray-curable components (A) and the photopolymerization initiator (B), and adding a silane coupling agent (C) as necessary. ) and additives.

[0090] Moreover, since the solventless adhesive composition P which concerns on this embodiment is a solventless type, it has suitable viscosity mainly by a polymerization component. Therefore, the non-solvent adhesive composition P according to this embodiment can be used as a coating solution without adding a diluent or the like.

[0091] [adhesive sheet]

[0092] The adhesive sheet according to the present embodiment includes an adhesive layer for adhering one display constituent member and the other display constituent member.

[0093] Such as figure 1 As shown, the adhesive sheet 1 according to the present embodiment as an example consists of two release sheets 12a, 12b, and is c...

Embodiment 1

[0159] 1. Preparation of Urethane Acrylate Oligomers

[0160] 1 mole of polypropylene glycol (PPG) with a weight average molecular weight of 9,200, 2 moles of isophorone diisocyanate (IPDI), and 2 moles of 2-hydroxyethyl acrylate (HEA) were polymerized to obtain urethane acrylate Oligomer-like polyether urethane acrylate with a weight average molecular weight of 9,900.

[0161] In addition, the weight average molecular weight of polypropylene glycol and polyether urethane acrylate is the standard polystyrene conversion value measured on the following conditions by gel permeation chromatography (GPC).

[0162] ・GPC measurement device: manufactured by TOSOH CORPORATION, HLC-8020

[0163] ・GPC column: Manufactured by TOSOH CORPORATION (below, listed in order of passage)

[0164] TSK guard Column HXL-H

[0165] TSK gel GMHXL (×2)

[0166] TSK gel G2000HXL

[0167] ·Measurement solvent: tetrahydrofuran

[0168] ·Measurement temperature: 40℃

[0169] 2. Preparation of solvent...

Embodiment 2

[0183] In the same manner as in Example 1, except that the type and blending amount of the photopolymerization initiator (B) were changed to 1.5 parts by mass of 2,4,6-trimethylbenzoyl-diphenyl-phosphine oxide An adhesive sheet and an adhesive sheet with a covering material were produced.

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Abstract

The invention provides a solvent-free adhesive composition, an adhesive sheet, and a display body, which are excellent in step followability and blister resistance. The solvent-free adhesive composition is a solvent-free adhesive composition for forming an adhesive layer (11), (11') for bonding one display member constituent member (21) and another display member constituent member (22). At leastone of the one display body constituent member (21) and another display body constituent member (22) is an ultraviolet shielding member having ultraviolet shielding properties. The solvent-free adhesive composition contains an active energy ray curable component (A), and a photopolymerization initiator (B) whose an absorbance at a wavelength of 390 nm in an acetonitrile solution having a concentration of 0.1% by mass is 0.3 or more.

Description

technical field [0001] The present invention relates to a solventless adhesive composition and an adhesive sheet for pasting display constituting members, and a display obtained by pasting display constituting members. Background technique [0002] Various mobile electronic devices such as mobile phones, smartphones, and tablet terminals in recent years are provided with displays (displays) using display modules including liquid crystal elements, light-emitting diodes (LED elements), organic electroluminescence ( Organic EL) elements, etc. [0003] In this display, a protective panel is usually provided on the front side of the display module. A gap is provided between the protective panel and the display module, so that even when the protective panel is deformed due to external force, the deformed protective panel will not collide with the display module. [0004] However, when there are gaps as described above, that is, when there is an air layer, the reflection loss of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09J7/10C09J7/30C09J175/14C09J11/06C08G18/48C08G18/75C08G18/67G09F9/00
CPCG09F9/00C09J7/10C09J7/30C09J11/06C09J175/14C08G18/4825C08G18/672C08G18/755C09J2475/00C09J2301/408C09J2301/414C09J2301/416C08G18/48C08K5/5435C09J4/00C09J4/06B32B27/00
Inventor 仓本达己高桥洋一渡边旭平
Owner LINTEC CORP
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