Electrically conductive paste

• US 9,761,349 B2
• Filed: 07/03/2014
• Issued: 09/12/2017
• Est. Priority Date: 07/08/2013
• Status: Active Grant

• Current Assignee: Toyobo Company Limited
• Original Assignee: Toyobo Company Limited
• Inventors: Imahashi, Satoshi
• Primary Examiner(s): MULVANEY, ELIZABETH EVANS
• Application Number:
  US14/901,763
• Publication Number:
  US 20160372230A1
• Time in Patent Office: 1,167 Days
• CPC Class Codes: C08K 2003/0806 Silver
• CPC Class Codes: C08K 2003/085 Copper
• CPC Class Codes: C08K 2201/016 Additives defined by their aspect ratio
• CPC Class Codes: C08K 3/08 Metals
• CPC Class Codes: C08K 7/06 Elements
• CPC Class Codes: C08K 9/04 Ingredients treated with organic substances treated with macromolecular compounds C08K9/08
• CPC Class Codes: C08L 21/00 Compositions of unspecified rubbers
• CPC Class Codes: C09D 5/24 Electrically-conducting paints conductive materials H01B1/00
• CPC Class Codes: H01B 1/22 the conductive material comprising metals or alloys
• CPC Class Codes: H01B 1/24 the conductive material comprising carbon-silicon compounds, carbon or silicon

Abstract

The present invention provides an excellent electrically conductive paste which is applicable or printable and stretchable and which ca realize an electrically conductive membrane having high electrical conductivity. An electrically conductive paste wherein a conductive, filler (B) is uniformly dispersed in a resin (A) characterized in that the resin (A) is a rubber (A1) containing sulfur atom and/or a rubber (A2) containing nitrile group, and that the conductive filler (B) is metal powder (B1) having an average particle diameter of 0.5 to 10 μm and a conductive material (B2) having a group selected from mercapto group, amino group and nitrite group on its surface and having an aspect ratio of 10 to 10,000. Instead of having said group on the surface, the conductive filler (B) may be subjected to a surface treatment with a rubber containing sulfide bond and/or nitrite group. Also, the conductive filler (B) may be metal nanowire.

Claims

1. An electrically conductive paste wherein a conductive filler (B) is uniformly dispersed in a resin (A), characterized in that the resin (A) is a rubber (A1) containing sulfur atom and/or a rubber (A2) containing nitrile group, that the conductive filler (B) is metal powder (B1) having an average particle diameter of 0.5 to 10 μ

m and a conductive material (B2) having a group selected from mercapto group, amino group and nitrile group on its surface and having an aspect ratio of 10 to 10,000, and that compounding amounts of the resin (A), the metal powder (B1) and the conductive material (B2) in the solid content of the electrically conductive paste are 50 to 80% by volume, 19 to 49% by volume and 1 to 10% by volume, respectively.

4. The electrically conductive paste according to claim 1, wherein the rubber (A1) containing sulfur atom is selected from polysulfide rubber, polyether rubber, polyacrylate rubber or silicone rubber containing mercapto group, sulfide bond or disulfide bond.

6. The electrically conductive paste according to claim 1, wherein the rubber (A2) containing nitrile group is a rubber of a copolymer of acrylonitrile with butadiene.

8. The electrically conductive paste according to claim 1, wherein the metal powder (B1) is flaky metal powder, spherical metal powder or aggregated metal powder.

11. The electrically conductive paste according to claim 1, wherein the conductive material (B2) is a carbon nanotube which has been subjected to a surface treatment with an aromatic compound containing mercapto group, amino group or nitrile group.

13. The electrically conductive paste according to claim 1, wherein the paste further contains metal nanoparticles (B3) having an average particle diameter of 2 to 100 nm as the conductive filler.

16. The electrically conductive paste according to claim 13, wherein the metal powder (B1) and the metal nanoparticles (B3) contain silver and/or copper as main ingredients.

19. An electrically conductive membrane or an electrically conductive pattern, characterized in that it is prepared by using the electrically conductive paste mentioned in claim 1.

22. An electrically conductive laminate, characterized in that it is prepared by forming the electrically conductive membrane or the electrically conductive pattern mentioned in claim 19 on a fabric substrate.

2. An electrically conductive paste wherein a conductive filler (B) is uniformly dispersed in a resin (A), characterized in that the resin (A) is a rubber (A1) containing sulfur atom and/or a rubber (A2) containing nitrile group, that the conductive filler (B) is metal powder (B1) having an average particle diameter of 0.5 to 10 μ

m and a conductive material (B2) having been subjected to a surface treatment with a rubber containing sulfide bond and/or nitrile group and having an aspect ratio of 10 to 10,000, and that compounding amounts of the resin (A), the metal powder (B1) and the conductive material (B2) in the solid content of the electrically conductive paste are 50 to 80% by volume, 19 to 49% by volume and 1 to 10% by volume, respectively.

5. The electrically conductive paste according to claim 2, wherein the rubber (A1) containing sulfur atom is selected from polysulfide rubber, polyether rubber, polyacrylate rubber or silicone rubber containing mercapto group, sulfide bond or disulfide bond.

7. The electrically conductive paste according to claim 2, wherein the rubber (A2) containing nitrile group is a rubber of a copolymer of acrylonitrile with butadiene.

9. The electrically conductive paste according to claim 2, wherein the metal powder (B1) is flaky metal powder, spherical metal powder or aggregated metal powder.

12. The electrically conductive paste according to claim 2, wherein the conductive material (B2) is a carbon nanotube which has been subjected to a surface treatment with a rubber containing sulfide bond and/or nitrile group.

14. The electrically conductive paste according to claim 2, wherein the paste further contains metal nanoparticles (B3) having an average particle diameter of 2 to 100 nm as the conductive filler.

17. The electrically conductive paste according to claim 14, wherein the metal powder (B1) and the metal nanoparticles (B3) contain silver and/or copper as main ingredients.

20. An electrically conductive membrane or an electrically conductive pattern, characterized in that it is prepared by using the electrically conductive paste mentioned in claim 2.

23. An electrically conductive laminate, characterized in that it is prepared by forming the electrically conductive membrane or the electrically conductive pattern mentioned in claim 20 on a fabric substrate.

3. An electrically conductive paste wherein a conductive filler (B) is uniformly dispersed in a resin (A), characterized in that the resin (A) is a rubber (A1) containing sulfur atom and/or a rubber (A2) containing nitrile group, that the conductive filler (B) is metal powder (B1) having an average particle diameter of 0.5 to 10 μ

m and a metal nanowire (B2) having an aspect ratio of 10 to 5,000, and that compounding amounts of the resin (A), the metal powder (B1) and the metal nanowire (B2) in the solid content of the electrically conductive paste are 50 to 80% by volume, 19 to 49% by volume and 1 to 10% by volume, respectively,

wherein the rubber (A1) containing sulfur atom is selected from polysulfide rubber, polyether rubber, polyacrylate rubber or silicone rubber containing mercapto group, sulfide bond or disulfide bond, and the rubber (A2) containing nitrile group is a rubber of a copolymer of acrylonitrile with butadiene.

10. The electrically conductive paste according to claim 3, wherein the metal powder (B1) is flaky metal powder, spherical metal powder or aggregated metal powder.

15. The electrically conductive paste according to claim 3, wherein the paste further contains metal nanoparticles (B3) having an average particle diameter of 2 to 100 nm as the conductive filler.

18. The electrically conductive paste according to claim 15, wherein the metal powder (B1) and the metal nanoparticles (B3) contain silver and/or copper as main ingredients.

21. An electrically conductive membrane or an electrically conductive pattern, characterized in that it is prepared by using the electrically conductive paste mentioned in claim 3.

24. An electrically conductive laminate, characterized in that it is prepared by forming the electrically conductive membrane or the electrically conductive pattern mentioned in claim 21 on a fabric substrate.

25. An electrically conductive paste wherein a conductive filler (B) is uniformly dispersed in a resin (A), characterized in that the resin (A) is a rubber (A1) containing sulfur atom and/or a rubber (A2) containing nitrile group, that the conductive filler (B) is metal powder (B1) having an average particle diameter of 0.5 to 10 μ

m and a metal nanowire (B2) having an aspect ratio of 20 to 5,000, and that compounding amounts of the resin (A), the metal powder (B1) and the metal nanowire (B2) in the solid content of the electrically conductive paste are 50 to 80% by volume, 19 to 49% by volume and 1 to 10% by volume, respectively.