Static-dissipative coating technology

• US 10,604,442 B2
• Filed: 11/16/2017
• Issued: 03/31/2020
• Est. Priority Date: 11/17/2016
• Status: Active Grant

• Current Assignee: Cardinal CG Company (Cardinal Glass Industries Incorporated)
• Original Assignee: Cardinal CG Company (Cardinal Glass Industries Incorporated)
• Inventors: Burrows, Keith James, Myli, Kari B.
• Primary Examiner(s): Ahmed, Sheeba
• Application Number:
  US15/814,629
• Publication Number:
  US 20180134615A1
• Time in Patent Office: 866 Days
• Field of Search: None
• CPC Class Codes: C03C 17/002 for flat glass, e.g. float glass
• CPC Class Codes: C03C 17/2456 Coating containing TiO2
• CPC Class Codes: C03C 17/3423 at least one of the coatings comprising a suboxide
• CPC Class Codes: C03C 17/3435 comprising a nitride, oxynitride, boronitride or carbonitride
• CPC Class Codes: C03C 2217/212 TiO2
• CPC Class Codes: C03C 2217/24 Doped oxides
• CPC Class Codes: C03C 2217/71 Photocatalytic coatings
• CPC Class Codes: C03C 2218/155 by reactive sputtering
• CPC Class Codes: C03C 2218/156 by magnetron sputtering
• CPC Class Codes: C09D 1/00 Coating compositions, e.g. paints, varnishes or lacquers, based on inorganic substances
• CPC Class Codes: C09D 5/00 Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced electrically insulating plastics, resins or waxes H01B3/30; Filling pastes
• CPC Class Codes: C09K 3/16 Anti-static materials
• CPC Class Codes: C23C 14/0036 Reactive sputtering
• CPC Class Codes: C23C 14/083 of refractory metals or yttrium
• CPC Class Codes: C23C 14/34 Sputtering
• CPC Class Codes: C23C 14/3485 using pulsed power to the target
• CPC Class Codes: C23C 4/134 Plasma spraying
• CPC Class Codes: E06B 3/66 Units comprising two or more parallel glass or like panes permanently secured together reforming and uniting glass sheets by fusing C03B23/00; joining glass to glass or to other materials C03C27/00; laminated glass B32B17/10
• CPC Class Codes: E06B 7/28 Other arrangements on doors or windows, e.g. door-plates, windows adapted to carry plants, hooks for window cleaners edge protecting devices for door leaves E06B3/88; special glazing; emergency glazing; double glazing E06B3/66

Abstract

The invention provides a glass sheet or another transparent substrate on which there is provided a static-dissipative coating. The static-dissipative coating includes a film comprising titania. The film comprising titania preferably is exposed so as to define an outermost face of the static-dissipative coating. The static-dissipative coating is characterized by an indoor dust collection factor of less than 0.145.

Claims

1. A transparent substrate on which there is provided a static-dissipative coating, the static-dissipative coating including a film comprising titania over a base film, the film comprising titania being exposed so as to define an outermost face of the static-dissipative coating, the film comprising titania having a thickness of greater than 25 angstroms but less than 150 angstroms, and wherein the film comprising titania comprises substoichiometric TiO_x, where x is less than 2 but greater than 1.8, the static-dissipative coating having a surface roughness R_a in a range of between about 0.05 and about 5 nm, the static-dissipative coating characterized by an indoor dust collection factor of less than 0.145, the indoor dust collection factor being grams of dust and calculated in accordance with Glass Dust Hazing test method of IBR JN 16775.

2. The transparent substrate of claim 1 wherein the indoor dust collection factor is less than 0.142 but greater than 0.050.

3. The transparent substrate of claim 2 wherein the indoor dust collection factor is less than 0.140 but greater than 0.050.

4. The transparent substrate of claim 1 wherein the static-dissipative coating is characterized by an outdoor dust collection factor of less than 0.036.

5. The transparent substrate of claim 4 wherein the outdoor dust collection factor is less than 0.032 but greater than 0.010.

6. The transparent substrate of claim 5 wherein the outdoor dust collection factor is less than 0.030 but greater than 0.010.

7. The transparent substrate of claim 1 wherein the static-dissipative coating has a surface resistance of greater than 10⁶ ohms per square.

8. The transparent substrate of claim 7 wherein the surface resistance of the static-dissipative coating is greater than 10⁸ ohms per square but less than 10¹¹ ohms per square.

9. The transparent substrate of claim 8 wherein the surface resistance of the static-dissipative coating is greater than 3.0×

10⁹ ohms per square but less than 7.0×

10⁹ ohms per square.

10. The transparent substrate of claim 1 wherein the static-dissipative coating has a thickness that is less than 500 angstroms.

11. The transparent substrate of claim 1 wherein the static-dissipative coating is devoid of an electrically conductive film beneath the film comprising titania.

12. The transparent substrate of claim 1 wherein the substoichiometric TiO_x is a film produced by sputtering in an atmosphere comprising a mix of oxygen gas and inert gas, where the mix comprises about 10-35% inert gas and about 65-90% oxygen gas.

13. The transparent substrate of claim 1 wherein the static-dissipative coating has a wet dynamic coefficient of friction of less than 0.07.

36. The transparent substrate of claim 1 wherein the base film consists essentially of silica, silicon nitride, or silicon oxynitride.

37. The transparent substrate of claim 1 wherein the indoor dust collection factor is less than 0.128 but greater than 0.050.

38. The transparent substrate of claim 1 wherein the thickness of the film comprising titania is between 30 angstroms and 95 angstroms.

39. The transparent substrate of claim 1 wherein the static-dissipative coating consists of the film comprising titania and the base film.

40. The transparent substrate of claim 1 wherein the film comprising titania consists of titanium oxide.

41. The transparent substrate of claim 1 wherein the film comprising titania consists essentially of sub stoichiometric TiO_x, where x is less than 2 but greater than 1.8.

42. The transparent substrate of claim 1 wherein the surface roughness R_a of the static-dissipative coating is in a range of between 0.2 nm and 4 nm.

43. The transparent substrate of claim 12 wherein the mix comprises about 15-25% inert gas and about 75-85% oxygen gas.

14. An insulating glass unit comprising two spaced-apart panes bounding a between-pane space, wherein one of the panes has an interior surface that is exposed to an interior of a building and that bears a static-dissipative coating, the static-dissipative coating including a film comprising titania over a base film, the film comprising titania being exposed so as to define an outermost face of the static-dissipative coating, the film comprising titania having a thickness of greater than 25 angstroms but less than 150 angstroms, and wherein the film comprising titania comprises substoichiometric TiO_x, where x is less than 2 but greater than 1.8, the static-dissipative coating having a surface roughness R_a in a range of between about 0.05 and about 5 nm, the static-dissipative coating characterized by an indoor dust collection factor of less than 0.145, the indoor dust collection factor being grams of dust and calculated in accordance with Glass Dust Hazing test method of IBR JN 16775.

15. The insulating glass unit of claim 14 wherein the indoor dust collection factor is less than 0.142 but greater than 0.050.

16. The insulating glass unit of claim 15 wherein the indoor dust collection factor is less than 0.140 but greater than 0.050.

17. The insulating glass unit of claim 14 wherein the static-dissipative coating is characterized by an outdoor dust collection factor of less than 0.036.

18. The insulating glass unit of claim 17 wherein the outdoor dust collection factor is less than 0.032 but greater than 0.010.

19. The insulating glass unit of claim 18 wherein the outdoor dust collection factor is less than 0.030 but greater than 0.010.

20. The insulating glass unit of claim 14 wherein the static-dissipative coating has a surface resistance of greater than 10⁶ ohms per square.

21. The insulating glass unit of claim 20 wherein the surface resistance of the static-dissipative coating is greater than 10⁸ ohms per square but less than 10¹¹ ohms per square.

22. The insulating glass unit of claim 21 wherein the surface resistance of the static-dissipative coating is greater than 3.0×

10⁹ ohms per square but less than 7.0×

10⁹ ohms per square.

23. The insulating glass unit of claim 14 wherein the static-dissipative coating has a thickness that is greater than 30 angstroms and less than 300 angstroms.

24. The insulating glass unit of claim 14 wherein the static-dissipative coating is devoid of an electrically conductive film beneath the film comprising titania.

25. The insulating glass unit of claim 14 wherein the substoichiometric TiO_x is a film produced by sputtering in an atmosphere comprising a mix of oxygen gas and inert gas, where the mix comprises about 10-35% inert gas and about 65-90% oxygen gas.

26. The insulating glass unit of claim 14 wherein the static-dissipative coating has a wet dynamic coefficient of friction of less than 0.07.

44. The insulating glass unit of claim 14 wherein the base film consists essentially of silica, silicon nitride, or silicon oxynitride.

45. The insulating glass unit of claim 14 wherein the indoor dust collection factor is less than 0.128 but greater than 0.050.

46. The insulating glass unit of claim 14 wherein the thickness of the film comprising titania is between 30 angstroms and 95 angstroms.

47. The insulating glass unit of claim 14 wherein the static-dissipative coating consists of the film comprising titania and the base film.

48. The insulating glass unit of claim 14 wherein the film comprising titania consists of titanium oxide.

49. The insulating glass unit of claim 14 wherein the film comprising titania consists of sub stoichiometric TiO_x, where x is less than 2 but greater than 1.8.

50. The insulating glass unit of claim 14 wherein the surface roughness R_a of the static-dissipative coating is in a range of between 0.2 nm and 4 nm.

51. The insulating glass unit of claim 25 wherein the mix comprises about 15-25% inert gas and about 75-85% oxygen gas.

27. A glass sheet on which there is provided a static-dissipative coating, the static-dissipative coating including a film comprising titania, the film comprising titania being exposed so as to define an outermost face of the static-dissipative coating, the film comprising titania having a thickness of greater than 25 angstroms but less than 150 angstroms, the static-dissipative coating having a surface roughness R_a in a range of between about 0.05 and about 5 nm, and the film comprising titania comprises substoichiometric TiO_x, where x is less than 2 but greater than 1.8, the substoichiometric TiO_x being a film produced by sputtering in an atmosphere comprising a mix of oxygen gas and inert gas, where the mix comprises about 10-35% inert gas and about 65-90% oxygen gas, the static-dissipative coating characterized by an indoor dust collection factor of less than 0.145, the indoor dust collection factor being grams of dust and calculated in accordance with Glass Dust Hazing test method of IBR JN 16775.

28. The glass sheet of claim 27 wherein the static-dissipative coating further comprises a base film, the film comprising titania being over the base film, the base film consisting essentially of silica, silicon nitride, or silicon oxynitride.

29. The glass sheet of claim 27 wherein the indoor dust collection factor is less than 0.128 but greater than 0.050.

30. The glass sheet of claim 28 wherein the static-dissipative coating consists of the film comprising titania and the base film.

31. The glass sheet of claim 27 wherein the mix comprises about 15-25% inert gas and about 75-85% oxygen gas.

32. The glass sheet of claim 27 wherein the static-dissipative coating has a thickness that is greater than 30 angstroms and less than 300 angstroms.

33. The glass sheet of claim 27 wherein the film comprising titania consists of titanium oxide.

34. The glass sheet of claim 27 wherein the film comprising titania consists of substoichiometric TiO_x, where x is less than 2 but greater than 1.8.

35. The glass sheet of claim 27 wherein the surface roughness R_a of the static-dissipative coating is in a range of between 0.2 nm and 4 nm.