Adhesive composition for touch panel, adhesive film and touch panel

Patent metadata

Field	Value
Publication number	US-10144854-B2
Application number	US-201414782330-A
Country	US
Kind code	B2
Filing date	Feb 27, 2014
Priority date	Apr 5, 2013
Publication date	Dec 4, 2018
Grant date	Dec 4, 2018

Abstract

Provided are an adhesive composition for a touch panel, including: a hydrophilic functional group-containing monomer and an adhesion promoter, wherein a dielectric constant at a frequency of 100 kHz to 2 MHz is 3.5 or less, and a storage modulus is 1.0×105 Pa to 7.0×105 Pa at 25° C. to 85° C., and an adhesive film including an adhesive layer including a cured product of the adhesive composition for a touch panel. In addition, provided is a touch panel including: a conductive plastic film having a conductive layer formed on one surface; and an adhesive layer attached onto the conductive layer and including a cured product of the adhesive composition for a touch panel.

First claim

The invention claimed is:

1. A cured adhesive layer formed from an adhesive composition for a touch panel, comprising:
a (meth)acrylic acid ester-based monomer, a hydrophilic functional group-containing monomer, a molecular weight regulator, and an adhesion promoter,
wherein the molecular weight regulator has a content of 0.05 parts by weight to 0.5 parts by weight, based on 100 parts by weight of the (meth)acrylic acid ester-based monomer, the hydrophilic functional group-containing monomer, and the adhesion promoter,
wherein the molecular weight regulator is at least one selected from the group consisting of 2-mercaptoacetate, n-dodecylmercaptan, and 4-4′ triobisbenzenetriol,
wherein a dielectric constant of the adhesive layer at a frequency of 100 kHz to 2 MHz is 3.5 or less, and a step-absorbing property (%) of the adhesive layer is 13% to 30%.

2. The cured adhesive layer of claim 1 , wherein the hydrophilic functional group-containing monomer is at least one selected from the group consisting of a hydroxyl group-containing monomer, an amino group-containing monomer, a carboxyl group-containing monomer, a sulfonic group-containing monomer, a morpholine group-containing monomer, and a glycidyl group-containing monomer.

3. The cured adhesive layer of claim 1 , wherein the hydrophilic functional group-containing monomer has a content of 30 parts by weight or less, based on 100 parts by weight of the(meth)acrylic acid ester-based monomer.

4. The cured adhesive layer of claim 1 , wherein the (meth)acrylic acid ester-based monomer is alkyl(meth)acrylate, and alkyl of the alkyl(meth)acrylate is linear or branched C1-C14 alkyl.

5. The cured adhesive layer of claim 1 , wherein the (meth)acrylic acid ester-based monomer is at least one selected from the group consisting of methyl (meth)acrylate, ethyl (meth)acrylate, n-propyl (meth)acrylate, isopropyl (meth)acrylate, n-butyl (meth)acrylate, t-butyl (meth)acrylate, sec-butyl (meth)acrylate, pentyl (meth)acrylate, 2-ethylhexyl (meth)acrylate, 2-ethylbutyl (meth)acrylate, n-octyl (meth)acrylate, isooctyl (meth)acrylate, isononyl (meth)acrylate, lauryl (meth)acrylate, and tetradecyl (meth)acrylate.

6. The cured adhesive layer of claim 1 , wherein the adhesion promoter is at least one selected from the group consisting of an amine-based liquid polymer, polyamine, a petroleum resin, polybutene, an acrylic modified resin, and an acryloyl morpholine resin.

7. The cured adhesive layer of claim 1 , wherein the adhesive composition for a touch screen panel further comprises a photoinitiator.

8. The cured adhesive layer of claim 7 , wherein the photoinitiator is at least one selected from the group consisting of a benzoin-based initiator, a hydroxy ketone-based initiator, an amino-ketone-based initiator, and caprolactam.

9. An adhesive film comprising the cured adhesive layer according to claim 1 .

10. A touch panel comprising:
a conductive plastic film having a conductive layer formed on one surface; and
the cured adhesive layer according to claim 1 , wherein the cured adhesive layer is attached to the conductive layer.

11. The touch panel of claim 10 , wherein the conductive plastic film is a polyethylene terephthalate film having a conductive metal oxide layer formed on one surface thereof.

Assignees

• Lg Chemical Ltd

Inventors

• Yoon Chan Oh
• Park Eun Kyung
• Jung Bu Gi
• Kim Jang Soon
• Park Sung Chan
• Kim Won Ho

Classifications

• C09J4/00 Primary

  Adhesives based on organic non-macromolecular compounds having at least one polymerisable carbon-to-carbon unsaturated bond {; adhesives, based on monomers of macromolecular compounds of groups C09J183/00 - C09J183/16} · CPC title

• G06F3/041

  Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means · CPC title

• C09J133/08 Primary

  Homopolymers or copolymers of acrylic acid esters · CPC title

• C08F220/18

  with acrylic or methacrylic acids · CPC title

• C09J2203/318

  for the production of liquid crystal displays · CPC title