P-static charge drain layer including carbon nanotubes

• US 9,545,042 B2
• Filed: 03/14/2014
• Issued: 01/10/2017
• Est. Priority Date: 03/14/2014
• Status: Active Grant

• Current Assignee: PPG Industries Ohio Incorporated (Nouryon BV)
• Original Assignee: PPG Industries Ohio Incorporated (Nouryon BV)
• Inventors: Bimanand, Alexander, Uprety, Krishna K., Lakdawala, Khushroo H.
• Primary Examiner(s): TRINH, MICHAEL MANH
• Application Number:
  US14/214,010
• Publication Number:
  US 20150264845A1
• Time in Patent Office: 1,033 Days
• Field of Search: 977/742, 977/750, 438/780
• US Class Current: 1/1
• CPC Class Codes: C08K 7/04 inorganic
• CPC Class Codes: C09D 1/00 Coating compositions, e.g. paints, varnishes or lacquers, based on inorganic substances
• CPC Class Codes: C09D 175/04 Polyurethanes
• CPC Class Codes: C09D 175/06 from polyesters
• CPC Class Codes: C09D 5/24 Electrically-conducting paints conductive materials H01B1/00
• CPC Class Codes: C09D 7/62 modified by treatment with other compounds
• CPC Class Codes: C09D 7/70 characterised by shape, e.g. fibres, flakes or microspheres
• CPC Class Codes: H05K 9/0079 Electrostatic discharge protection, e.g. ESD treated surface for rapid dissipation of charges
• CPC Class Codes: Y10T 428/263 Coating layer not in excess of 5 mils thick or equivalent
• CPC Class Codes: Y10T 428/266 of base or substrate
• CPC Class Codes: Y10T 428/269 including synthetic resin or polymer layer or component
• CPC Class Codes: Y10T 428/30 Self-sustaining carbon mass or layer with impregnant or other layer

Abstract

A coating including a carbon nanotube layer including carbon nanotubes; and a coating layer on the carbon nanotube layer is disclosed. The coating layer may include a polyurethane polymer, a polyacrylate polymer, a polysiloxane polymer, an epoxy polymer, or a combination thereof. A coated substrate including the coating is also disclosed.

Claims

1. A coating comprising:

a carbon nanotube layer comprising carbon nanotubes; and

a coating layer on the carbon nanotube layer, wherein the coating layer comprises a polyurethane polymer formed from a coating composition comprising;

a hydrophobic first aliphatic polyisocyanate;

a second aliphatic polyisocyanate comprising a hydrophilic portion;

a polyester polyol;

a hydrophilic polyol;

a fluorinated polyol; and

a fluorinated alcohol having one hydroxyl group.

2. The coating of claim 1, wherein the coating layer further comprises a polyacrylate polymer, a polysiloxane polymer, an epoxy polymer, or a combination thereof.

3. The coating of claim 1, wherein the carbon nanotubes are single-walled nanotubes.

4. The coating of claim 1, wherein the coating has a visible light transmittance of >

80%.

5. The coating of claim 1, wherein at least a portion of the carbon nanotubes of the carbon nanotube layer are embedded in the coating layer.

6. The coating of claim 1, wherein the carbon nanotube layer and the coating layer are separate layers.

7. The coating of claim 1, wherein the coating layer has a thickness of about 1 μ

m to 120 μ

m.

8. The coating of claim 7, wherein the coating layer has a thickness of about 2 μ

m to 90 μ

m.

9. The coating layer of claim 1, wherein the carbon nanotube layer has a thickness of about 1 nm to 15 nm.

10. The coating of claim 1, wherein the carbon nanotube layer is formed from a carbon nanotube coating composition comprising the carbon nanotubes in an amount of 0.01 wt % to 2 wt % based on the total weight of the carbon nanotube coating composition.

11. The coating of claim 1, wherein the coating has a thickness of about 1 μ

m to 140 μ

m.

12. The coating of claim 1, wherein the carbon nanotube layer consists essentially of carbon nanotubes.

13. The coating of claim 1, wherein the coating layer comprises a conductive agent.

14. A coated substrate comprising:

a substrate; and

the coating of claim 1 on the substrate.

15. The coated substrate of claim 14, further comprising a tie layer between the substrate and the coating.

16. The coated substrate of claim 15, wherein at least a portion of the coating layer permeates the carbon nanotube layer and is adhered to the tie layer.

17. The coated substrate of claim 15, wherein the tie layer comprises a polyurethane polymer, a polyacrylate polymer, a polysiloxane polymer, an epoxy polymer, or a combination thereof.

18. The coated substrate of claim 14, wherein the coated substrate has a visible light transmittance >

80%.

19. A vehicle comprising the coated substrate of claim 14.