Electrically conductive paste

Patent metadata

Field	Value
Publication number	US-11776707-B2
Application number	US-202117907976-A
Country	US
Kind code	B2
Filing date	Mar 4, 2021
Priority date	Mar 6, 2020
Publication date	Oct 3, 2023
Grant date	Oct 3, 2023

Abstract

An electrically conductive paste includes: an elastic binder; and a conductive filler. The conductive filler includes: at least one spherical conductive filler, at least one plate-like conductive filler, and at least one rod-like conductive filler. In an embodiment, the spherical filler has a mean particle diameter, measured in accordance with ISO 21501-2:2019-11 of at most 200 μm.

First claim

The invention claimed is:

1. An electrically conductive paste, comprising:
an elastic binder; and
a conductive filler,
wherein the conductive filler comprises: at least one spherical conductive filler, at least one plate-like conductive filler, and at least one rod-like conductive filler, and
wherein a content of the filler in relation to an overall weight of the conductive paste, is from 0.03 wt % to 25 wt %.

2. The electrically conductive paste of claim 1 , wherein the spherical filler has a mean particle diameter, measured in accordance with ISO 21501-2:2019-11 of at most 200 μm.

3. The electrically conductive paste of claim 2 , wherein the mean particle diameter is 0.02 μm to 200 μm.

4. The electrically conductive paste of claim 3 , wherein the mean particle diameter is at most 100 μm.

5. The electrically conductive paste of claim 4 , wherein the mean particle diameter is from 0.02 μm to 100 μm.

6. The electrically conductive paste of claim 5 , wherein the mean particle diameter is from 0.02 μm to 50 μm.

7. The electrically conductive paste of claim 6 , wherein the mean particle diameter is from 0.02 μm to 10 μm.

8. The electrically conductive paste of claim 1 , wherein a content of the spherical filler, in relation to an overall weight of the conductive paste, is from 0.1 to 25 wt %.

9. The electrically conductive paste of claim 1 , wherein the plate-like filler has an aspect ratio of at least 1/10 and smaller than 1/10 6 .

10. The electrically conductive paste of claim 1 , wherein the plate-like filler has a mean particle size, measured in accordance with ISO 21501-2:2019-11 of at most 150 μm.

11. The electrically conductive paste of claim 1 , wherein a content of the plate-like filler in relation to an overall weight of the conductive paste, is from 0.5 to 25 wt %.

12. The electrically conductive paste of claim 1 , wherein the rod-like filler has a mean aspect ratio of at least 0.1.

13. The electrically conductive paste of claim 1 , wherein a content of the rod-like filler in relation to an overall weight of the conductive paste, is from 0.01 to 10 wt %.

14. The electrically conductive paste of claim 1 , wherein a content of the filler in relation to an overall weight of the conductive paste, is from 0.03 wt % to 20 wt %.

15. The electrically conductive paste of claim 1 , wherein a content of the binder in relation to an overall weight of the conductive paste is from 50 wt % to 99 wt %.

16. The electrically conductive paste of claim 1 , wherein the elastic binder comprises thermoplastic elastomers.

17. The electrically conductive paste of claim 1 , wherein the electrically conductive paste has a stretchability of at least 30% measured in accordance with EN ISO 527-1 (February 2012).

18. The electrically conductive paste of claim 1 , wherein the electrically conductive paste is applied to an elastomeric substrate.

19. A method, comprising:
applying the electrically conductive paste of claim 1 to elastomeric substrates.

20. A method of producing an electrically conductive paste, comprising:
producing or providing a dispersion comprising an elastic binder; and
introducing a conductive filler into the dispersion, the conductive filler comprising: at least one spherical conductive filler, at least one plate-like conductive filler, and at least one rod-like conductive filler,
wherein a content of the filler in relation to an overall weight of the conductive paste, is from 0.03 wt % to 25 wt %.

Assignees

• Freudenberg Carl Kg

Inventors

• Schmidt Stanislaus
• Schmied Benno
• Schmalzel Ivan
• Sutter Marco

Classifications

• H01B1/20 Primary

  Conductive material dispersed in non-conductive organic material {(organic macromolecular compounds or compositions C08)} · CPC title

• C08J3/215

  at least one additive being also premixed with a liquid phase · CPC title

• C08K13/04

  Ingredients characterised by their shape and organic or inorganic ingredients · CPC title

• C08J2375/04

  Polyurethanes · CPC title

• C08K3/041

  Carbon nanotubes · CPC title