Touch panel

Patent metadata

Field	Value
Publication number	US-9550926-B2
Application number	US-201414158228-A
Country	US
Kind code	B2
Filing date	Jan 17, 2014
Priority date	Jul 19, 2011
Publication date	Jan 24, 2017
Grant date	Jan 24, 2017

Abstract

Provided is a touch panel. The touch panel includes a base and a pressure-sensitive adhesive layer attached to the base and including an acryl-based polymer containing an acryl polymer containing 5 to 30 parts by weight of isobornyl (meth)acrylate, and 5 to 40 parts by weight of methyl (meth)acrylate in a polymerized form. Accordingly, it can effectively inhibit penetration of oxygen, moisture or other impurities at an interface between the base and the pressure-sensitive adhesive layer, or at an interface between a conductor thin film and the pressure-sensitive adhesive layer, and prevent degradation in optical properties such as visibility, etc. due to bubbles generated at the pressure-sensitive adhesive interface. In addition, when the pressure-sensitive adhesive layer is directly attached to the conductor thin film and even exposed to severe conditions such as high temperature or high temperature and high humidity, a change in the resistance of the conductor thin film may be effectively inhibited, and thus the touch panel can be stably driven for a long time.

First claim

What is claimed is:

1. A touch panel, comprising:
a base including an indium tin oxide (ITO) film formed on at least one surface thereof; and
a pressure-sensitive adhesive layer directly attached to the ITO film on the base, which comprises an acryl polymer containing 5 to 28 parts by weight of isobornyl acrylate monomer and 5 to 35 parts by weight of methyl acrylate monomer in a polymerized form wherein the acryl polymer has a weight average molecular weight of 750,000 to 2,500,000,
wherein the pressure-sensitive adhesive layer has a peel strength with respect to a polycarbonate sheet of 2,500 g/25 mm or more at a peel angle of 180 degrees, a peel rate of 300 mm/min and at room temperature, and a resistance change ratio of the indium tin oxide (ITO) film of 6% or less,
wherein the pressure-sensitive adhesive layer completely covers the ITO film,
wherein the pressure-sensitive adhesive layer comprises a thiol compound or a thiol polymer derived from an acryl monomer and a thiol compound, and,
wherein the thiol compound is at least one of compounds represented by Formulas 2 to 5:

where A 1 to A 3 are independently linear or branched alkylene, R 1 is linear or branched alkyl, R 2 is hydrogen, an alkyl group or -A 4 -C(-A 5 -O—C(═O)-A 6 -SH) n R (3-n) , A 4 to A 6 are independently linear or branched alkylene, R is linear or branched alkyl, and n is an integer between 1 and 3.

2. The touch panel according to claim 1 , wherein the acryl polymer further comprises 30 to 80 parts by weight of a monomer represented by Formula 1, and 0.01 to 20 parts by weight of a copolymerizable monomer having a crosslinkable functional group:

where R 1 is hydrogen or a methyl group, and R 2 is a linear or branched alkyl group having at least 2 carbon atoms.

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

4. A pressure-sensitive adhesive composition for a touch panel, comprising:
an acryl polymer containing 5 to 28 parts by weight of isobornyl acrylate monomer, and 5 to 35 parts by weight of methyl acrylate monomer in a polymerized form, and a thiol compound,
wherein the acryl polymer has a weight average molecular weight of 750,000 to 2,500,000,
wherein the touch panel comprises a base including an indium tin oxide (ITO) film formed on at least one surface thereof; and a pressure-sensitive adhesive layer directly attached to the ITO film on the base,
wherein the pressure-sensitive adhesive layer is formed from the pressure sensitive adhesive composition, and completely covers the ITO film,
wherein the pressure-sensitive adhesive layer has a peel strength with respect to a polycarbonate sheet of 2,500 g/25 mm or more at a peel angle of 180 degrees, a peel rate of 300 mm/min and at room temperature, and a resistance change ratio of the ITO film of 6% or less, and
wherein the thiol compound is at least one of compounds represented by Formulas 2 to 5:

where A 1 to A 3 are independently linear or branched alkylene, R 1 is linear or branched alkyl, R 2 is hydrogen, an alkyl group or -A 4 -C(-A 5 -O—C(═O)-A 6 -SH) n R (3-n) , A 4 to A 6 are independently linear or branched alkylene, R is linear or branched alkyl, and n is an integer between 1 and 3.

5. A double-sided pressure-sensitive adhesive tape for a touch panel, comprising a pressure-sensitive adhesive layer formed of the pressure-sensitive adhesive composition according to claim 4 .

Assignees

• Lg Chemical Ltd

Inventors

• Park Min Soo
• Yang Se Woo
• Chang Suk Ky

Classifications

• Y10T428/2891

  including addition polymer from alpha-beta unsaturated carboxylic acid [e.g., acrylic acid, methacrylic acid, etc.] Or derivative thereof · CPC title

• C09J2203/318

  for the production of liquid crystal displays · CPC title

• C09J133/12 Primary

  Homopolymers or copolymers of methyl methacrylate · CPC title

• C09J11/08

  Macromolecular additives · CPC title

• C09J133/066

  containing -OH groups · CPC title