Pressure sensitive adhesive composition for touch panel

• US 9,556,364 B2
• Filed: 10/20/2011
• Issued: 01/31/2017
• Est. Priority Date: 10/20/2010
• Status: Active Grant

• Current Assignee: LG Chem Limited (LG Corporation)
• Original Assignee: LG Chem Limited (LG Corporation)
• Inventors: Park, Min Soo, Yang, Se Woo, Chang, Suk Ky, Kim, Woo Ha, Hwang, Yoon Tae
• Primary Examiner(s): DESAI, ANISH P
• Application Number:
  US13/880,611
• Publication Number:
  US 20130201145A1
• Time in Patent Office: 1,930 Days
• Field of Search: None
• US Class Current: 1/1
• 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 capacitance touch panel including a conductive film, comprising:

a substrate;

a conductive layer on at least one surface of the substrate; and

a pressure-sensitive adhesive layer including a pressure-sensitive adhesive composition in a cured state,

wherein the pressure-sensitive adhesive layer directly covers an entire surface of the conductive layer,

wherein the pressure-sensitive adhesive composition comprises an acryl polymer having a polydispersity index of 4.0 or less, wherein the acryl polymer comprises 97 to 99.999 parts by weight of a (meth)acrylic acid ester-based monomer and 0.005 to 1 parts by weight of a thiol compound,

wherein the (meth)acrylic acid ester-based monomer includes a methyl (meth)acrylate monomer and a monomer represented by Formula 1;

wherein the thiol compound binds to the acryl polymer, and

wherein the thiol compound is represented by Formula 2;

2. The capacitance touch panel according to claim 1, wherein R₂ is an alkyl group having 4 to 20 carbon atoms.

3. The capacitance touch panel according to claim 1, wherein the acryl polymer further comprises copolymerizable monomers having a crosslinkable functional group in a polymerized form.

4. The capacitance touch panel according to claim 3, wherein the crosslinkable functional group is a carboxyl group, a hydroxyl group, a nitrogen-containing group, an epoxy group or an isocyanate group.

5. The capacitance touch panel according to claim 1, wherein the pressure-sensitive adhesive composition further comprises a multifunctional crosslinking agent crosslinking the acryl polymer.

6. The capacitance touch panel according to claim 5, wherein the multifunctional crosslinking agent is an isocyanate crosslinking agent, an epoxy crosslinking agent, an aziridine crosslinking agent, or a metal chelate crosslinking agent.

7. The capacitance touch panel according to claim 1, wherein the substrate is a plastic substrate.

8. A capacitance touch panel including a conducive film, comprising:

a substrate;

a first conductive layer formed on the substrate;

a pressure-sensitive adhesive layer including a pressure-sensitive adhesive composition in a cured state; and

a plate on which a second conductive layer is formed on one surface thereof,

wherein the pressure-sensitive adhesive layer directly covers an entire surface of the first conductive layer formed on the substrate and an entire surface of the second conductive layer formed on the plate,

wherein the pressure-sensitive adhesive composition comprises an acryl polymer having a polydispersity index of 4.0 or less, wherein the acryl polymer comprises 97 to 99.999 parts by weight of a (meth)acrylic acid ester-based monomer and 0.005 to 1 parts by weight of a thiol compound,

wherein the (meth)acrylic acid ester-based monomer includes a methyl (meth)acrylate monomer and a monomer represented by Formula 1;

wherein the thiol compound binds to the acryl polymer, and

wherein the thiol compound is represented by Formula 2;

9. The capacitance touch panel according to claim 8, wherein R₂ is an alkyl group having 4 to 20 carbon atoms.

10. The capacitance touch panel according to claim 8, wherein the acryl polymer further comprises copolymerizable monomers having a crosslinkable functional group in a polymerized form.

11. The capacitance touch panel according to claim 10, wherein the crosslinkable functional group is a carboxyl group, a hydroxyl group, a nitrogen-containing group, an epoxy group or an isocyanate group.

12. The capacitance touch panel according to claim 8, wherein the pressure-sensitive adhesive composition further comprises a multifunctional crosslinking agent crosslinking the acryl polymer.

13. The capacitance touch panel according to claim 12, wherein the multifunctional crosslinking agent is an isocyanate crosslinking agent, an epoxy crosslinking agent, an aziridine crosslinking agent, or a metal chelate crosslinking agent.

14. The capacitance touch panel according to claim 8, wherein the substrate is a plastic substrate.