Resistive heating coatings containing graphenic carbon particles

Patent metadata

Field	Value
Publication number	US-9832818-B2
Application number	US-201414529786-A
Country	US
Kind code	B2
Filing date	Oct 31, 2014
Priority date	Sep 30, 2011
Publication date	Nov 28, 2017
Grant date	Nov 28, 2017

Abstract

Resistive heating assemblies comprising a substrate, a conductive coating comprising graphenic carbon particles applied to at least a portion of the substrate, and a source of electrical current connected to the conductive coating are disclosed. Conductive coatings comprising graphenic carbon particles having a thickness of less than 100 microns and an electrical conductivity of greater than 10,000 S/m are also disclosed.

First claim

We claim:

1. A resistive heating assembly comprising:
a substrate;
a conductive coating applied to at least a portion of the substrate having a thickness of at least 1 micron comprising graphenic carbon particles dispersed in a polymeric film-forming resin binder throughout the thickness of the conductive coating, wherein the conductive coating has an electrical conductivity of greater than 10,000 S/m, and
a source of electrical current connected to the conductive coating.

2. The resistive heating assembly of claim 1 , wherein the conductive coating has a thickness of less than 100 microns.

3. The resistive heating assembly of claim 1 , wherein the graphenic carbon particles comprise thermally produced graphenic carbon particles.

4. The resistive heating assembly of claim 3 , wherein the thermally produced graphenic carbon particles have a BET specific surface area of at least 70 square meters per gram.

5. The resistive heating assembly of claim 1 , wherein the graphenic carbon particles are functionalized.

6. A conductive coating having a thickness of from 1 to 100 microns and an electrical conductivity of greater than 10,000 S/m comprising graphenic carbon particles dispersed in a polymeric film-forming resin binder throughout the thickness of the conductive coating.

7. The conductive coating of claim 6 , wherein the graphenic carbon particles comprise thermally produced graphenic carbon particles.

8. The conductive coating of claim 7 , wherein the thermally produced graphenic carbon particles are produced in a thermal zone having a temperature of greater than 3,500° C. and have an average aspect ratio of greater than 3:1.

9. The conductive coating of claim 7 , wherein the thermally produced graphenic carbon particles have a BET specific surface area of at least 70 square meters per gram.

10. The conductive coating of claim 6 , wherein the graphenic carbon particles comprise at least two types of graphenic carbon particles.

11. The conductive coating of claim 10 , wherein one of the types of graphenic carbon particles comprises thermally produced graphenic carbon particles.

12. The conductive coating of claim 11 , wherein the thermally produced graphenic carbon particles comprise from 4 to 40 weight percent of the total amount of the graphenic carbon particles.

13. The conductive coating of claim 6 , wherein the polymeric film-forming resin binder comprises epoxy resins, acrylic polymers, polyester polymers, polyurethane polymers, polyamide polymers, polyether polymers, bisphenol A based epoxy polymers, polysiloxane polymers, styrenes, ethylenes, butylenes, copolymers thereof, or combinations thereof.

14. The conductive coating of claim 6 , wherein the graphenic carbon particles comprise from 40 to 95 weight percent of the conductive coating.

15. The conductive coating of claim 6 , wherein the graphenic carbon particles comprise from 50 to 90 weight percent of the conductive coating.

16. The conductive coating of claim 6 , wherein the electrical conductivity is greater than 20,000 S/m.

17. The conductive coating of claim 6 , wherein the electrical conductivity is greater than 30,000 S/m.

18. The conductive coating of claim 6 , wherein the coating is deposited from a co-dispersion comprising:
a solvent;
at least one polymeric dispersant; and
at least two types of graphenic carbon particles co-dispersed in the solvent and the polymeric dispersant.

19. The resistive heating assembly of claim 1 , wherein the conductive coating has a thickness of at least 5 microns.

20. The conductive coating of claim 6 , wherein the conductive coating has a thickness of at least 5 microns.

21. A resistive heating assembly comprising:
a substrate;
a conductive coating applied to at least a portion of the substrate having a thickness of at least 1 micron comprising graphenic carbon particles dispersed in a polymeric film-forming resin binder throughout the thickness of the conductive coating wherein the conductive coating has an electrical conductivity of greater than 10,000 S/m; and
a source of electrical current connected to the conductive coating,
the graphenic carbon particles comprise thermally produced graphenic carbon particles and have a BET specific surface area of at least 70 square meters per gram.

22. A resistive heating assembly comprising:
a substrate;
a conductive coating applied to at least a portion of the substrate having a thickness of at least 1 micron comprising graphenic carbon particles dispersed in a polymeric film-forming resin binder throughout the thickness of the conductive coating, wherein the graphenic carbon particles are functionalized; and
a source of electrical current connected to the conductive coating.

Assignees

• Ppg Ind Ohio Inc

Inventors

• Decker Eldon L
• Vanier Noel R
• Furar John M
• Istivan Stephen B
• Hung Cheng-Hung

Classifications

• H05B2214/04

  Heating means manufactured by using nanotechnology · CPC title

• H05B2203/011

  Heaters using laterally extending conductive material as connecting means · CPC title

• H05B3/26

  heating conductor mounted on insulating base {(for transparent areas H05B3/84, H05B3/86)} · CPC title

• H05B3/34

  flexible, e.g. heating nets or webs · CPC title

• H05B2203/013

  Heaters using resistive films or coatings · CPC title