UV-CURABLE COATING CONTAINING CARBON NANOTUBES

• US 20120256139A1
• Filed: 04/08/2011
• Published: 10/11/2012
• Est. Priority Date: 04/08/2011
• Status: Abandoned Application

• Current Assignee: Bayer Materialscience LLC (Covestro AG)
• Original Assignee: Bayer Materialscience LLC (Covestro AG)
• Inventors: Hunt, Robert N., Williams, Charles Todd
• Application Number:
  US13/082,763
• Publication Number:
  US 20120256139A1
• Time in Patent Office: Days
• US Class Current: 252/510
• CPC Class Codes: B82Y 30/00 Nanotechnology for materials or surface science, e.g. nanocomposites
• CPC Class Codes: H01B 1/24 the conductive material comprising carbon-silicon compounds, carbon or silicon

Abstract

The present invention provides a conductive, curable coating made from about 0.01 wt. % to about 5 wt. %, of multi-walled carbon nanotubes, having a diameter of greater than about 4 nm, about 10 wt. % to about 99 wt. % of an aliphatic urethane acrylate and about 0.1 wt. % to about 15 wt. % of a photoinitiator, wherein the coating is curable by exposure to radiation and wherein the cured coating has a surface resistivity of about 10²Ω/□ to about 10¹⁰Ω/□. A process for the production of such coatings is also provided. There are many applications where carbon nanotubes in a radiation curable coating may enhance properties other than conductivity, such as physical and thermal properties.

Claims

1. A conductive, curable coating comprising:

about 0.01 wt. % to about 5 wt. % of multi-walled carbon nanotubes having a diameter of greater than about 4 nm;

about 10 wt. % to about 99 wt. % of an aliphatic urethane acrylate; and

about 0.1 wt. % to about 15 wt. % of a photoinitiator,

wherein the weight percentages are based on the weight of the formulation, wherein the coating is curable by exposure to radiation and wherein the cured coating has a surface resistivity of about 10²Ω

/□

to about 10¹⁰Ω

/□

.

2. The conductive, curable coating according to claim 1, wherein the multi-walled carbon nanotubes are present in an amount of about 0.1 wt. % to about 3 wt. %.

3. The conductive, curable coating according to claim 1, wherein the multi-walled carbon nanotubes are present in an amount of about 2 wt. % to about 3 wt %.

4. The conductive, curable coating according to claim 1, wherein the aliphatic urethane acrylate is present in an amount of about 50 wt. % to about 90 wt. %.

5. The conductive, curable coating according to claim 1, wherein the aliphatic urethane acrylate is present in an amount of about 40 wt. % to about 80 wt. %.

6. The conductive, curable coating according to claim 1, wherein the photoinitiator is present in an amount of about 1 wt. % to about 7 wt. %.

7. The conductive, curable coating according to claim 1, wherein the photoinitiator is present in an amount of about 3 wt. % to about 5 wt. %.

8. The conductive, curable coating according to claim 1, wherein the photoinitiator is selected from 20% phosphine oxide, phenyl bis(2,4,6-trimethyl benzoyl)/80% 2-hydroxy-2-methyl-1-phenyl-1-propanone and 1-hydroxycyclohexyl benzophenone.

9. The conductive, curable coating according to claim 1, wherein the multi-walled carbon nanotubes are non-functionalized.

10. The conductive, curable coating according to claim 1, wherein the multi-walled carbon nanotubes having a diameter of about 5 nm to about 20 nm.

11. The conductive, curable coating according to claim 1, wherein the coating is curable by exposure to radiation of about 200 nm to about 420 nm.

12. A process for producing a conductive, curable coating comprising:

combining

about 0.01 wt. % to about 5 wt. % of multi-walled carbon nanotubes having a diameter of greater than about 4 nm,

about 10 wt. % to about 99 wt. % of an aliphatic urethane acrylate, and

about 0.1 wt. % to about 15 wt. % of a photoinitiator,

wherein the weight percentages are based on the weight of the formulation; and

curing the coating by exposure to radiation,

wherein the cured coating has a surface resistivity of about 10²Ω

/□

to about 10¹⁰Ω

/□

.

13. The process according to claim 12, wherein the multi-walled carbon nanotubes are present in an amount of about 0.1 wt. % to about 3 wt. %.

14. The process according to claim 12, wherein the multi-walled carbon nanotubes are present in an amount of about 2 wt. % to about 3 wt. %.

15. The process according to claim 12, wherein the aliphatic urethane acrylate is present in an amount of about 50 wt. % to about 90 wt. %.

16. The process according to claim 12, wherein the aliphatic urethane acrylate is presenting an amount of about 40 wt. % to about 80 wt. %.

17. The process according to claim 12, wherein the photoinitiator is present in an amount of about 1 wt. % to about 7 wt. %.

18. The process according to claim 12, wherein the photoinitiator is present in an amount of about 3 wt. % to about 5 wt. %.

19. The process according to claim 12, wherein the photoinitiator is selected from 20% phosphine oxide, phenyl bis(2,4,6-trimethyl benzoyl)/80% 2-hydroxy-2-methyl-1-phenyl-1-propanone and 1-hydroxycyclohexyl benzophenone.

20. The process according to claim 12, wherein the multi-walled carbon nanotubes are non-functionalized.

21. The process according to claim 12, wherein the multi-walled carbon nanotubes having a diameter of about 5 nm to about 20 nm.

22. The process according to claim 12, wherein the coating is cured by exposure to radiation of about 200 nm to about 420 nm.