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Urethane adhesive, adhesive sheet, and display

A technology of urethane and adhesive, which is applied in the direction of polyurea/polyurethane adhesive, adhesive, adhesive type, etc., can solve the problems of unstudied properties of optical components, and achieve good resistance to heat and humidity, whitening, and dust The effect of low adhesion

Active Publication Date: 2017-08-29
TOYO INK SC HOLD CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Conventionally, as a surface protection sheet for protecting various optical members from scratches and dust adhesion, etc., an adhesive sheet in which an adhesive layer is formed on a base sheet has been widely used. and the influence of vibration, etc., have basically not been studied

Method used

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  • Urethane adhesive, adhesive sheet, and display
  • Urethane adhesive, adhesive sheet, and display
  • Urethane adhesive, adhesive sheet, and display

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0189] Hereinafter, synthesis examples, examples of the present invention, and comparative examples will be described. In addition, in the following description, unless otherwise indicated, "part" means "mass part", and "%" means "mass %".

[0190] "Determination of Mw, Mn, Mw / Mn"

[0191] Weight average molecular weight (Mw), number average molecular weight (Mn), and molecular weight distribution (Mw / Mn) are measured by gel permeation chromatography (GPC) method. The measurement conditions are as follows. In addition, both Mw and Mn are values ​​in terms of polystyrene.

[0192]

[0193] Device: Shimadzu Prominence (SHIMADZU Prominence) (manufactured by Shimadzu Corporation),

[0194] String: Connect three pieces of Sodex (SHODEX) LF-804 (manufactured by Showa Denko Co., Ltd.) in series,

[0195] Detector: differential refractive index detector,

[0196] Solvent: tetrahydrofuran (tetrahydrofuran, THF),

[0197] Flow rate: 0.5mL / min,

[0198] Solvent temperature: 40°C...

Synthetic example 1

[0232] Add 50 parts of polyester polyol (a-1-1) and 850 parts of polyether having one or more EO groups to a four-necked flask equipped with a stirrer, reflux cooling pipe, nitrogen gas introduction pipe, thermometer and dropping funnel Polyol (a-2-1). 650 parts of toluene was added thereto. Furthermore, 0.25 parts of dibutyltin dilaurate and 0.1 part of 2-ethylhexanoate tin were added as a catalyst. Under nitrogen atmosphere, it heated up gradually to 90 degreeC, NCO / OH ratio (functional group ratio) became 0.6 quantity (48 parts) of polyisocyanate (b-1), and it reacted for 2 hours after that. After the disappearance of the remaining isocyanate groups was confirmed by infrared absorption (IR) spectroscopy, the reaction solution was cooled to complete the reaction, thereby obtaining a urethane prepolymer (A-1) solution (non-volatile content: 60%) . The weight average molecular weight (Mw) of the obtained urethane prepolymer (A-1) was 78,000.

[0233] The kinds of polyol (a...

Embodiment 1

[0244] 100 parts of the urethane prepolymer (A-1) obtained in Synthesis Example 1, 30 parts of the fatty acid ester (B-1), and 0.3 parts of the antioxidant "IRGANOX L 135" (manufactured by BASF) , 0.3 parts of UV absorber "TINUVIN (TINUVIN) 571" (manufactured by BASF), 0.3 parts of light stabilizer "DINUVIN (TINUVIN) 765" (manufactured by BASF), 15 parts of isocyanate hardener ( I-1) and 100 parts of ethyl acetate as a solvent were blended and stirred with a disperser to obtain a urethane adhesive. In addition, the usage-amount of each material except a solvent shows the non-volatile matter conversion value (it is the same in other Examples and a comparative example). The types and blending ratios of the materials used are shown in Table 2-1.

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Abstract

The invention discloses an urethane adhesive, an adhesive sheet, and a display. Provided is a urethane adhesive that can be applied as a thick film, and with which it is possible to form an adhesive layer with good resistance to whitening caused by moist heat. The urethane adhesive contains a urethane prepolymer (A) which is a reaction product of at least one type of polyol (a-1) excluding a polyether polyol having one or more EO groups within the molecule, at least one type of polyether polyol (a-2) having one or more EO groups within the molecule, and at least one type of polyisocyanate (b). In one embodiment, the urethane adhesive of the present invention may contain a urethane prepolymer (A) and a [Beta]-diketone compound (X).

Description

technical field [0001] The present invention relates to a urethane adhesive, an adhesive sheet and a display using the same. Background technique [0002] Flat panel displays such as liquid crystal displays (LCD) and organic electroluminescence displays (OELD), and touch panel displays that combine the flat panel displays with touch panels are widely used. In electronic equipment such as television (television, TV), personal computer (personal computer, PC), mobile phone and portable information terminal. [0003] In recent years, the various displays described above have been thinned and reduced in weight. Among them, thin and lightweight OELDs are expected to attract attention because they can achieve high brightness with low power. The OELD has a stacked structure in which one or more organic layers, such as an organic light-emitting layer and an organic charge transport layer, are stacked on a substrate. OELD can also be made flexible by using a plastic film as a subs...

Claims

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Application Information

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IPC IPC(8): C09J175/08C08G18/10C08G18/48C09J7/02C09J11/06C09J175/06H01L51/50C09J7/20
CPCC09J7/20C09J7/30C09J11/06C09J175/06C09J175/08C08K5/101C08K5/07C08G18/10C08G18/48
Inventor 田邉慎吾斋藤秀平
Owner TOYO INK SC HOLD CO LTD