PRESSURE SENSITIVE ADHESIVE COMPOSITION FOR TOUCH PANEL (As Amended)

• US 20130201145A1
• Filed: 10/20/2011
• Published: 08/08/2013
• Est. Priority Date: 10/20/2010
• Status: Active Grant

• Current Assignee: LG Chem Limited (LG Corporation)
• Original Assignee: LG Chem Limited (LG Corporation)
• Inventors: Chang, Suk Ky, Kim, Woo Ha, Park, MIn Soo, Yang, Se Woo, Hwang, Yoon Tae
• Granted Patent: US 9,556,364 B2
• Time in Patent Office: Days
• US Class Current: 345/173
• CPC Class Codes: C08L 2203/206 use in coating or encapsulating of electronic parts
• CPC Class Codes: C09J 133/066 containing -OH groups
• CPC Class Codes: C09J 133/14 of esters containing halogen, nitrogen, sulfur or oxygen atoms in addition to the carboxy oxygen
• CPC Class Codes: C09J 2203/318 for the production of liquid crystal displays
• CPC Class Codes: C09J 2301/122 the adhesive layer being present only on one side of the carrier, e.g. single-sided adhesive tape
• CPC Class Codes: C09J 2301/314 the adhesive layer and/or the carrier being conductive
• CPC Class Codes: C09J 2433/00 Presence of (meth)acrylic polymer
• CPC Class Codes: C09J 7/22 Plastics; Metallised plastics
• CPC Class Codes: C09J 7/29 Laminated material metallised plastics C09J7/22
• CPC Class Codes: C09J 7/38 Pressure-sensitive adhesives [PSA]
• CPC Class Codes: C09J 7/385 Acrylic polymers
• CPC Class Codes: Y10T 428/2891 including addition polymer from alpha-beta unsaturated carboxylic acid [e.g., acrylic acid, methacrylic acid, etc.] Or derivative thereof

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.

Claims

1. A pressure-sensitive adhesive composition for a touch panel, comprising an acryl polymer including a (meth)acrylic acid ester monomer as a polymerization unit, wherein a thiol compound is bound to the acryl polymer.

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

3. The composition according to claim 1, wherein the thiol compound bound to the acryl polymer is represented by Formula 2:

HS—

R₂  

 

[Formula 2]

wherein R₂ is an alkyl group or -A-C(═

O)—

O—

R₃, A is an alkylene group or alkylidene group, R₃ is hydrogen, an alkyl group or -D-C(-E-O—

C(═

O)-Q-SH)_n(R₄)(_3-n), D, E and Q are each independently an alkylene group or alkylidene group, R₄ is an alkyl group, and n is an integer between 1 and 3.

4. The composition according to claim 3, wherein R₂ is an alkyl group having 4 to 20 carbon atoms.

5. The composition according to claim 1, wherein the acryl polymer comprises 97 to 99.999 parts by weight of a (meth)acrylic acid ester-based monomer, and 0.001 to 3 parts by weight of a thiol-based compound.

6. The composition according to claim 1, wherein the acryl polymer further comprises a polymerized form of copolymerizable monomers having a crosslinkable functional group.

7. The composition according to claim 6, wherein the crosslinkable functional group is a carboxyl group, a hydroxyl group, a nitrogen-containing group, an epoxy group or an isocyanate group.

8. The composition according to claim 1, further comprising a multifunctional crosslinking agent crosslinking the acryl polymer.

9. The composition according to claim 8, wherein the multifunctional crosslinking agent is an isocyanate crosslinking agent, an epoxy crosslinking agent, an aziridine crosslinking agent, or a metal chelate crosslinking agent.

10. The composition according to claim 1, which meets the conditions expressed by Equation 1:

Δ

R═

[(R−

R_i)/R_i]×

100≦

15%  

 

[Equation 1]

wherein A R is a resistance change ratio, R_i is an initial resistance of the 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.

11. 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.

12. 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.

13. The conductive film according to claim 12, wherein the substrate is a plastic substrate.

14. The conductive film according to claim 12, 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.

15. The conducive film according to claim 12, 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.

16. The conductive film according to claim 15, further comprising a conductive layer formed on the substrate, wherein the conductive layer formed on the substrate is attached to the conductive layer formed on the plate by a pressure-sensitive adhesive layer.

17. A touch panel comprising a conductive film according to claim 12.