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Pressure-sensitive adhesive, pressure-sensitive adhesive sheet, and laminate for touch panel

A pressure-sensitive adhesive, pressure-sensitive adhesive sheet technology, applied in the direction of adhesive types, ester copolymer adhesives, film/sheet-like adhesives, etc., can solve the problem of difficult to inhibit pressure-sensitive adhesives. Layer whitening phenomenon, degassing and other problems, to achieve the effect of good step height followability, good adhesion, excellent humidity and heat resistance stability

Active Publication Date: 2016-03-16
SOKEN CHEM & ENG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, there are still problems as follows: as a material characteristic of PC, there is a characteristic of degassing under high temperature conditions, and it is difficult to suppress pressure-sensitive adhesion caused by foaming under heat-resistant conditions and moisture inflow under humid-heat conditions. Problems such as whitening of the agent layer
However, the weight-average molecular weight of the acrylic polymer to be crosslinked described in Patent Document 2 is 400,000 to 1.6 million, which has the above-mentioned problems.

Method used

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  • Pressure-sensitive adhesive, pressure-sensitive adhesive sheet, and laminate for touch panel
  • Pressure-sensitive adhesive, pressure-sensitive adhesive sheet, and laminate for touch panel
  • Pressure-sensitive adhesive, pressure-sensitive adhesive sheet, and laminate for touch panel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0157] Next, the present invention will be described in more detail by showing examples of the present invention, but the present invention is not limited to these examples.

[0158] The weight-average molecular weight, gel fraction, wet-heat whitening property, heat-resistant foaming property, ITO corrosion property, step height followability, and adhesive strength of the pressure-sensitive adhesive were measured by the methods shown below.

[0159] [test methods]

[0160]

[0161] The weight average molecular weight (Mw) in terms of standard polystyrene was determined using gel permeation chromatography (GPC).

[0162] Measurement conditions

[0163] Device: HLC-8120GPC (manufactured by Tosoh Corporation)

[0164] Pillars: Use the following five-column columns.

[0165] TSK-GELHXL-H (guard column, manufactured by Tosoh Corporation)

[0166] TSK-GELG7000HXL (manufactured by Tosoh Corporation)

[0167] TSK-GELGMHXL (manufactured by Tosoh Corporation)

[0168] TSK-GELGM...

manufacture example 1

[0210]60 parts by weight of methoxy ethyl acrylate (MEA), 34 parts by weight of butyl acrylate (BA), 2-hydroxyethyl acrylate (2-HEA) 4 parts by weight, acrylamide (AM) 2 parts by weight, ethyl acetate (EtAc) 100 parts by weight, methyl ethyl ketone (MEK) 20 parts by weight, and the temperature was raised to 70° C. while introducing nitrogen gas.

[0211] Next, 0.2 parts by weight of azobisisobutyronitrile (AIBN) was added, and a polymerization reaction was performed at 70° C. for 5 hours under a nitrogen atmosphere.

[0212] After completion of the reaction, it was diluted with ethyl acetate (EtAc) to adjust the solid content concentration to 30%, to obtain an acrylic polymer 1 with a weight average molecular weight of 300,000.

manufacture example 2

[0214] 60 parts by weight of methoxy ethyl acrylate (MEA), 34 parts by weight of butyl acrylate (BA), 2-hydroxyethyl acrylate (2-HEA) 4 parts by weight, dimethylaminoethyl acrylate (DMAEA) 2 parts by weight, ethyl acetate (EtAc) 100 parts by weight, methyl ethyl ketone (MEK) 20 parts by weight, while introducing nitrogen The temperature was raised to 70°C.

[0215] Next, 0.2 parts by weight of azobisisobutyronitrile (AIBN) was added, and a polymerization reaction was performed at 70° C. for 5 hours under a nitrogen atmosphere.

[0216] After completion of the reaction, it was diluted with ethyl acetate (EtAc) to adjust the solid content concentration to 30%, to obtain an acrylic polymer 2 with a weight average molecular weight of 300,000.

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Abstract

The present invention provides a pressure-sensitive adhesive used in a touch panel having a conductive film made of metal or metal oxide, a pressure-sensitive adhesive sheet, and a laminate for a touch panel using the same. Among pressure-sensitive adhesives, they are excellent in heat resistance, moisture-heat resistance stability, and step followability, and are not corrosive to metals or metal oxides. The pressure-sensitive adhesive is characterized by comprising an acrylic polymer (A) and an aliphatic isocyanate-based crosslinking agent (B) in an amount of 0.1 to 5 parts by weight based on 100 parts by weight of the acrylic polymer (A). , the acrylic polymer (A) is a unit containing 20 to 99.9% by weight of the following component (a-1) alkoxy (meth)acrylate and (a-2) having a crosslinkable functional group. An acrylic polymer (A) obtained by copolymerizing 0.1 to 10% by weight of a body, having substantially no acidic group, and having a weight average molecular weight of 50,000 or more and less than 400,000.

Description

technical field [0001] The present invention relates to a pressure-sensitive adhesive that can be used in a laminate for touch panels, a pressure-sensitive adhesive sheet in which the pressure-sensitive adhesive is formed into a sheet, and a touch panel to which components are pasted using the pressure-sensitive adhesive sheet. Laminates for panels. Background technique [0002] Touch panels currently used in the mainstream generally include resistive touch panels and capacitive touch panels. These touch panels are laminated bodies of various materials, and acrylic pressure-sensitive adhesives are mainly used for lamination. Since the touch panel unit is arranged on the outermost surface of the screen, it is required to have high transparency, and further, high heat resistance, heat and humidity resistance, and other characteristics. Specifically, the touch panel unit is a laminated body of various materials and is arranged on the outermost surface of the touch panel device...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09J133/14C09J133/08C09J11/06C09J7/00B32B7/12G06F3/041
CPCC08K5/0025C08K5/29C09J11/06C09J133/14C09J2203/318C09J7/22C09J7/29C09J7/385G06F3/0412G06F3/0416
Inventor 工藤良太金塚洋平
Owner SOKEN CHEM & ENG CO LTD
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