Pressure-sensitive adhesive composition for touch panel

Patent metadata

Field	Value
Publication number	US-9556365-B2
Application number	US-201113880597-A
Country	US
Kind code	B2
Filing date	Oct 20, 2011
Priority date	Oct 20, 2010
Publication date	Jan 31, 2017
Grant date	Jan 31, 2017

Abstract

Provided are a pressure-sensitive adhesive composition for a touch panel, a conductive film, a touch panel and a pressure-sensitive adhesive film. The exemplary pressure-sensitive adhesive composition for a touch panel, the conductive film or the pressure-sensitive adhesive film has excellent durability and optical properties such as transparency. In addition, such physical properties are stably maintained under severe conditions. Particularly, a pressure-sensitive adhesive layer is attached to a conductor thin film, and thus resistance change of the conductor thin film is effectively inhibited even when the conductor thin film is exposed to the severe conditions. Therefore, the pressure-sensitive adhesive composition may be effectively used to manufacture a touch panel.

First claim

What is claimed is:

1. A pressure-sensitive adhesive composition for a touch panel, consisting of:
an acryl polymer;
a thiol compound; and
a multifunctional crosslinking agent crosslinking the acryl polymer,
wherein the thiol compound represented by Formula 1 is included in an amount of 0.001 to 5 parts by weight with respect to 100 parts by weight of the acryl polymer, and
wherein the composition meets the condition expressed by Equation 1:
Δ R =[( R−R i )/ R i ]×100≦15%  Equation 1

wherein ΔR is a resistance change ratio, R i is an initial resistance of an indium tin oxide (ITO) electrode measured after the pressure-sensitive adhesive layer which is a cured product of the pressure-sensitive adhesive composition is attached to the ITO electrode, R is a resistance of the ITO electrode measured after the ITO electrode to which the pressure-sensitive adhesive layer is attached is maintained at 60° C. and a relative humidity of 90% for 240 hours,
HS—R 2   Formula 1

wherein R 2 is an alkyl group or -A—C(═O)—O—R 3 , A is an alkylene group or alkylidene group, R 3 is hydrogen, an alkyl group or -D-C(-E-O—C(═O)-Q-SH) n (R 4 ) (3-n) , D, E and Q are each independantly an alkylene group or alkylidene group, R 4 is an alkyl group, and n is an integer between 1 and 3.

2. The pressure-sensitive composition according to claim 1 , wherein the acryl polymer includes a (meth)acrylic acid ester monomer, and a monomer having a crosslinkable functional group as a polymerization unit.

3. The pressure-sensitive composition according to claim 2 , wherein the (meth)acrylic acid ester monomer is an alkyl (meth)acrylate including an alkyl group having 1 to 20 carbon atoms.

4. The pressure-sensitive composition according to claim 2 , wherein the crosslinkable functional group is a hydroxyl, carboxyl, nitrogen-containing, epoxy or isocyanate group.

5. The pressure-sensitive composition according to claim 1 , wherein the acryl polymer has a weight average molecular weight of 350,000 to 2,500,000.

6. The pressure-sensitive composition according to claim 1 , wherein R 2 is an alkyl group having 4 to 20 carbon atoms.

7. The pressure-sensitive composition according to claim 1 , wherein the multifunctional crosslinking agent is an isocyanate crosslinking agent, an epoxy crosslinking agent, an aziridine crosslinking agent, or a metal chelate crosslinking agent.

8. A pressure-sensitive adhesive film for a touch panel comprising a pressure-sensitive adhesive layer including a pressure-sensitive adhesive composition according to claim 1 in a cured state.

9. A conductive film, comprising:
a substrate; and
a pressure-sensitive adhesive layer formed on one or both surfaces of the substrate, and including a pressure-sensitive adhesive composition according to claim 1 in a cured state.

10. The conductive film according to claim 9 , wherein the substrate is a plastic substrate.

11. The conductive film according to claim 9 , further comprising a conductive layer on at least one surface of the substrate, wherein the pressure-sensitive adhesive layer is attached to the conductive layer.

12. The conducive film according to claim 9 , further comprising a plate having a conductive layer formed on one surface thereof, wherein the pressure-sensitive adhesive layer is attached to the conductive layer of the plate.

13. The conductive film according to claim 12 , further comprising a conductive layer formed on the substrate, where the conductive layer formed on the substrate is attached to the conductive layer formed on the plate by the pressure-sensitive adhesive layer.

14. A touch panel comprising a conductive film according to claim 9 .

Assignees

• Park Min Soo
• Yang Se Woo
• Chang Suk Ky
• Kim Woo Ha
• Hwang Yoon Tae
• Lg Chemical Ltd

Inventors

• Park Min Soo
• Yang Se Woo
• Chang Suk Ky
• Kim Woo Ha
• Hwang Yoon Tae

Classifications

• C09J7/22 Primary

  Plastics; Metallised plastics · CPC title

• C09J7/29

  Laminated material (metallised plastics C09J7/22) · CPC title

• C09J4/00

  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

• G06F3/0416

  Control or interface arrangements specially adapted for digitisers · CPC title

• B32B2457/208

  Touch screens · CPC title