Light transmitting electrically conductive member and method for patterning the same

Patent metadata

Field	Value
Publication number	US-9965124-B2
Application number	US-201615005428-A
Country	US
Kind code	B2
Filing date	Jan 25, 2016
Priority date	Aug 5, 2013
Publication date	May 8, 2018
Grant date	May 8, 2018

Abstract

A method for patterning a light transmitting electrically conductive member uses a light transmitting laminate material in which an electrically conductive layer including an overcoat layer and silver nanowires embedded therein is formed on a surface of a light transmitting base film and includes a step of treating a surface of the electrically conductive layer which is not covered with a resist layer using an iodine solution to at least partially iodize the silver nanowires and a step of applying a thiosulfate solution to the surface of the electrically conductive layer which is not covered with the resist layer to remove a silver iodide exposed to a surface of the overcoat layer. Since a white cloudy or a whitened silver iodide is removed, the optical transmission characteristics of the non-electrically conductive region can be improved.

First claim

What is claimed is:

1. A light transmitting electrically conductive member comprising:
a light transmitting base material; and
an electrically conductive layer which includes an overcoat layer and silver nanowires included therein and which is provided on a surface of the light transmitting base material and the electrically conductive layer having an amount of silver iodide formed by iodizing the silver nanowires,
wherein the electrically conductive layer is partitioned into an electrically conductive region and a non-electrically conductive region having a high surface resistivity compared to that of the electrically conductive region, wherein the amount of silver iodide in the overcoat layer comprises the non-electrically conductive region, and the silver nanowires are partially exposed to surface of the overcoat layer in the electrically conductive region, and
wherein the silver iodide formed by iodizing the silver nanowires is not exposed to the surface of the overcoat layer in the non-electrically conductive region.

2. The light transmitting electrically conductive member according to claim 1 , wherein the overcoat layer is made of light transmitting resin.

3. The light transmitting electrically conductive member according to claim 1 , wherein the overcoat layer is made of an acrylic-based resin.

4. A light transmitting electrically conductive member comprising:
a light transmitting base material; and
an electrically conductive layer which includes an overcoat layer and silver nanowires included therein and which is provided on a surface of the light transmitting base material and the electrically conductive layer having an amount of a silver iodide formed by iodizing the silver nanowires,
wherein the electrically conductive layer is partitioned into an electrically conductive region and a non-electrically conductive region having a high surface resistivity as compared to that of the electrically conductive region, wherein the amount of silver iodide in the overcoat layer comprises the non-electrically conductive region, and wherein and the silver nanowires are partially exposed to a surface of the overcoat layer in the electrically conductive region; and
wherein the amount of a silver iodide exposed to the surface of the overcoat layer in the non-electrically conductive region is small compared to the amount of silver nanowires exposed to the surface of the overcoat layer in the electrically conductive region.

5. The light transmitting electrically conductive member according to claim 4 , wherein the overcoat layer is made of light transmitting resin.

6. The light transmitting electrically conductive member according to claim 4 , wherein the overcoat layer is made of an acrylic-based resin.

7. A method for patterning a light transmitting electrically conductive member, the method using a light transmitting laminate material in which an electrically conductive layer including an overcoat layer and silver nanowires included therein is formed on a surface of a light transmitting base material, and the method comprising:
covering a part of the electrically conductive layer with a resist layer;
treating a surface of the electrically conductive layer which is not covered with the resist layer using an iodine solution to at least partially iodize the silver nanowires to form silver iodide; and
applying a thiosulfate solution to the surface of the electrically conductive layer which is not covered with the resist layer to remove at least some of the silver iodide exposed on a surface of the overcoat layer and wherein the silver iodide formed from the silver nanowires remains in the overcoat layer.

8. The method for patterning a light transmitting electrically conductive member according to claim 7 , wherein the iodine solution is an iodine-potassium iodine solution.

9. The method for patterning a light transmitting electrically conductive member according to claim 8 , wherein in the iodine-potassium iodine solution, the concentration of iodine is 0.05 to 1.0 percent by mass, and the concentration of potassium iodine is 0.1 to 5.0 percent by mass.

10. The method for patterning a light transmitting electrically conductive member according to claim 7 , wherein the thiosulfate solution is a sodium thiosulfate solution.

11. The method for patterning a light transmitting electrically conductive member according to claim 10 , wherein the concentration of sodium thiosulfate is 1.0 to 25 percent by mass.

12. The method of patterning a light transmitting electrically conductive member according to claim 7 , wherein the overcoat layer is made of a light transmitting resin.

13. The method of patterning a light transmitting electrically conductive member according to claim 7 , wherein the overcoat layer is made of a light transmitting resin.

14. A light transmitting electrically conductive member comprising:
a light transmitting base material; and
an electrically conductive layer which includes an overcoat layer and silver nanowires included therein which is provided on a surface of the light transmitting base material, and the electrically conductive layer having nanowires of silver iodide formed by iodizing the silver nanowires;

wherein the electrically conductive layer is partitioned into an electrically conductive region and a non-electrically conductive region having a high surface resistivity compared to that of the electrically conductive region, and
wherein the silver nanowires are partially exposed to a surface of the overcoat layer in the electrically conductive region, and nanowires of silver iodide are included in the overcoat layer in the non-electrically conductive region, and the nanowires of silver iodide are not exposed to a surface of the overcoat layer in the non-electrically conductive region.

15. The light transmitting electrically conductive member according to claim 14 , wherein the overcoat layer is made of light transmitting resin.

16. The light transmitting electrically conductive member according to claim 14 , wherein the overcoat layer is made of an acrylic-based resin.

17. A light transmitting electrically conductive member comprising:
a light transmitting base material; and
an overcoat layer provided on a surface of the light transmitting base material,
wherein the overcoat layer is partitioned into an electrically conductive region and a non-electrically conductive region having a high surface resistivity as compared to that of the electrically conductive region,
wherein the electrically conductive region of the overcoat layer includes silver nanowires, and wherein the non-electrically conductive region of the overcoat layer includes nanowires of silver iodide formed by iodizing the silver nanowires, and
wherein the silver nanowires are partially exposed to a surface of the overcoat layer in the electrically conductive region, and the nanowires of silver iodide are not exposed to a surface of the overcoat layer in the non-electrically conductive region.

18. The light transmitting electrically conductive member according to claim 17 , wherein the overcoat layer is made of light transmitting resin.

19. The light transmitting electrically conductive member according to claim 17 , wherein the overcoat layer is made of an acrylic-based resin.

20. A light transmitting electrically conductive member comprising:
a light transmitting base material; and
an electrically conductive layer which includes an overcoat layer and silver nanowires included therein and which is provided on a surfa

Assignees

• Alps Electric Co Ltd

Inventors

• Yamai Tomoyuki
• Bito Mitsuo
• Kitamura Yasuyuki

Classifications

• G06F3/041

  Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means · CPC title

• G06F2203/04103

  Manufacturing, i.e. details related to manufacturing processes specially suited for touch sensitive devices · CPC title

• H03K17/962

  Capacitive touch switches · CPC title

• G06F3/044 Primary

  by capacitive means · CPC title

• G06F2203/04112

  Electrode mesh in capacitive digitiser: electrode for touch sensing is formed of a mesh of very fine, normally metallic, interconnected lines that are almost invisible to see. This provides a quite large but transparent electrode surface, without need for ITO or similar transparent conductive material · CPC title