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Optical transparent adhesive sheet, optical transparent adhesive sheet production method, laminate, and touch panel-equipped display device

A technology of optically transparent and adhesive sheets, which is applied in chemical instruments and methods, adhesive products, identification devices, etc., can solve the problems of consumption and difficulty in obtaining thick-film OCA sheets, etc., to improve operability, improve visibility, The effect of suppressing whitening

Inactive Publication Date: 2018-08-31
BANDO CHEM IND LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, when the acrylic resin composition is an ultraviolet curable resin composition, when ultraviolet rays are irradiated, free radicals (free radicals) required for reaction in the surface part of the acrylic resin are consumed, and the bottom part is not cured, Therefore it is difficult to obtain thick film OCA sheet

Method used

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  • Optical transparent adhesive sheet, optical transparent adhesive sheet production method, laminate, and touch panel-equipped display device
  • Optical transparent adhesive sheet, optical transparent adhesive sheet production method, laminate, and touch panel-equipped display device
  • Optical transparent adhesive sheet, optical transparent adhesive sheet production method, laminate, and touch panel-equipped display device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0112] First, a solid hydrogenated petroleum resin-based thickener (IMARV P-100) is added to polyolefin polyol (EPOL) at a temperature of 100°C to 150°C, and stirred to obtain a thickener-dissolved Thickener masterbatch in polyolefin polyol. The content of the thickener in the thickener masterbatch was adjusted to 30% by weight. Then, using a reciprocating rotary mixer AJITER (AJITER) to mix 100 parts by weight of polyolefin polyol (EPOL), 24 parts by weight of HDI-based polyisocyanate A, 163 parts by weight of thickener masterbatch and 0.01 parts by weight of catalyst (Dimethyltin dilaurate) was stirred and mixed to prepare a thermosetting polyurethane composition.

[0113] Thereafter, the obtained thermosetting polyurethane composition was injected into figure 2 The forming device 20 is shown. Furthermore, the thermosetting polyurethane composition was transported while being sandwiched by a pair of release films (PET film with a release treatment on the surface) 21, and...

Embodiment 2～ Embodiment 5 and comparative example 1～ comparative example 4

[0116] Except for changing the formulation or the thickness of the optically transparent adhesive sheet as shown in the following Table 1, it was carried out in the same manner as in Example 1, and the mold release films of Examples 2 to 5 and Comparative Examples 1 to 4 were produced, respectively. optically clear adhesive sheet.

[0117]

[0118] Furthermore, in the above-mentioned Table 1, "HDI-based A" means "HDI-based polyisocyanate A", "HDI-based B" means "HDI-based polyisocyanate B", and "HDI-based C" means "HDI-based polyisocyanate C". , "HDI-based D" means "HDI-based polyisocyanate D", and "HDI-based E" means "HDI-based polyisocyanate E".

[0119] (Characteristics and Evaluation of Optically Clear Adhesive Sheets)

[0120] Regarding the optically clear adhesive sheets with release films produced in Examples and Comparative Examples, (1) measurement of moisture absorption, (2) measurement of initial haze, (3) after high-temperature and high-humidity test were carri...

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PUM

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Abstract

The present invention provides an optical transparent adhesive sheet having excellent environment resistance, using a thermosetting polyurethane composition that has excellent flexibility and can be thickened. This optical transparent adhesive sheet comprises a cured product of the thermosetting polyurethane composition, the thermosetting polyurethane composition containing an olefinic polyol component and a polyisocyanate component, and in the case where a test is conducted in which the thermosetting polyurethane composition is put in a high temperature and high humidity environment having atemperature of 85 DEG C and a humidity of 85%, the amount of moisture absorption after being placed in the test for eight hours is 1.0 wt% or less, and the haze after being place in the test for 100 hours is 1.5% or less.

Description

technical field [0001] The present invention relates to an optically transparent adhesive sheet, a method for producing the optically transparent adhesive sheet, a laminate, and a display device with a touch panel. Background technique [0002] An optically clear adhesive (OCA: Optically Clear Adhesive) sheet is a transparent adhesive sheet used for bonding of optical members. In recent years, the demand for touch screens in the fields of smart phones, tablet personal computers (Personal Computer, PC), portable game consoles, car navigation devices, etc. has increased rapidly. Demand for OCA tablets also increased. A display device equipped with a touch panel generally has a display panel such as a liquid crystal panel laminated thereon, a transparent member (touch panel main body) having a transparent conductive film containing indium tin oxide (Indium Tin Oxide, ITO) or the like on its surface, and a cover panel for protecting the transparent conductive film. and other o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09J7/10C09J7/30B32B27/00B32B27/40C08G18/62C08J5/18C09J175/04G09F9/00
CPCB32B27/00C08G18/62C08J5/18C09J175/04G09F9/00C09J2203/318C09J7/30C09J7/10B32B27/40C09J2475/00C09J7/40C09J7/38B32B7/06B32B27/08B32B27/36C08G18/6204C08G18/73G06F3/041B32B2250/40B32B2250/24B32B2250/03B32B2457/208B32B2405/00
Inventor 中根聡一郎细川祐希大西淳
Owner BANDO CHEM IND LTD
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