Substrate with transparent conductive layer and method for producing the same, and touch panel using the same

• US 8,642,895 B2
• Filed: 02/27/2009
• Issued: 02/04/2014
• Est. Priority Date: 02/29/2008
• Status: Expired due to Fees

• Current Assignee: Toray Industries Incorporated
• Original Assignee: Toray Industries Incorporated
• Inventors: Mata, Junji, Tsukamoto, Jun, Sekiguchi, Hiroki
• Primary Examiner(s): NGUYEN, HOA CAO
• Application Number:
  US12/919,121
• Publication Number:
  US 20110025645A1
• Time in Patent Office: 1,803 Days
• Field of Search: 174/250, 174255-259, 174/546, 174/126.4, 252/500, 252/502, 252/511, 977/742, 977/753, 427/77, 427/108, 428/408, 345/173, 345/174, 345/176, 345/177
• US Class Current: 174/257
• CPC Class Codes: G06F 3/0443 using a single layer of sensing electrodes
• CPC Class Codes: H01B 1/24 the conductive material comprising carbon-silicon compounds, carbon or silicon
• CPC Class Codes: Y10T 428/30 Self-sustaining carbon mass or layer with impregnant or other layer

Abstract

A substrate with a transparent conductive layer includes a transparent supporting substrate, a thermosetting resin layer containing 50% by weight or more of a melamine resin, and a carbon nanotube conductive layer in this order, wherein a value of linearity of resistance of the carbon nanotube conductive layer is 1.5% or less.

Claims

1. A substrate with a transparent conductive layer comprising

a transparent supporting substrate, a thermosetting resin layer containing 50% by weight or more of a melamine resin, and

a carbon nanotube conductive layer, in this order, the carbon nanotube conductive layer having an in-plane uniformity providing a value of linearity of resistance of the carbon nanotube conductive layer, wherein the value of linearity of resistance of the carbon nanotube conductive layer is 1.5% or less.

2. The substrate according to claim 1, wherein the melamine resin is to methyloled melamine resin.

3. The substrate according to claim 1, wherein a change in a resistance value of the carbon nanotube conductive layer after a heat treatment at 150°

C. for 30 minutes is 20% or less.

4. The substrate according to claim 1, which has a structure in which a portion of a carbon nanotube contained in the carbon nanotube conductive layer is embedded in the thermosetting resin layer.

5. The substrate according to claim 1, wherein a surface resistance of the carbon nanotube conductive layer is 1×

10⁰Ω

/□

or more and 1×

10⁴Ω

/□

or less.

6. The substrate according to claim 1, wherein a transmittance of light having a wavelength of 550 nm is 60% or more.

7. The substrate according to claim 1, wherein surface resistance after applying an adhesive tape on a surface of the carbon nanotube conductive layer and peeling the adhesive tape at an angle of 60°

is at most 1.5 times as large as surface resistance before applying an adhesive tape.

8. A method for producing the substrate according to claim 1, comprising:

(1) coating a thermosetting resin composition containing 50% by weight or more of a melamine resin on a transparent supporting substrate to form a coating layer,

(2) coating a carbon nanotube dispersion liquid containing 50% by weight or more of water on the coating layer of the thermosetting resin composition by slit die coating, gravure coating, reverse coating, screen printing or print transfer, and

(3) conducting a heat treatment at a temperature of a heat curing temperature or higher of the thermosetting resin composition.

9. The method according to claim 8, wherein a contact angle of water at 25°

C. on the surface of the coating layer of the thermosetting resin composition formed in the step (1) is 40 degrees or less.

10. A touch panel comprising the substrate according to claim 1.

11. The touch panel according to claim 10, which is a resistive touch panel, wherein two substrates with a transparent conductive layer are disposed so that surfaces of the conductive layers oppose to each other through a space, and at least one substrate with a transparent conductive layer is the substrate.

12. The touch panel according to claim 10, comprising the substrate and a drive circuit, and is a capacitive touch panel.