Conductive coating treatment of glass sheet bending process

• US 4,655,811 A
• Filed: 12/23/1985
• Issued: 04/07/1987
• Est. Priority Date: 12/23/1985
• Status: Expired due to Term

• Current Assignee: Donnelly Corporation (Magna International Incorporated)
• Original Assignee: Donnelly Corporation (Magna International Incorporated)
• Inventors: Bitter, Lowell E.
• Primary Examiner(s): NOT, DEFINED
• Application Number:
  US06/813,558
• Time in Patent Office: 470 Days
• Field of Search: 65/60.51, 65/60.60, 65/106, 65/107, 427/109, 427/58, 204/192 R, 204/192 SP, 204/192 M, 204/192 C, 204/298
• US Class Current: 65/60.51
• CPC Class Codes: B32B 17/10018 comprising only one glass sheet
• CPC Class Codes: B32B 17/10174 Coatings of a metallic or dielectric material on a constituent layer of glass or polymer
• CPC Class Codes: C03B 23/0252 by gravity only, e.g. sagging C03B23/035 takes precedence
• CPC Class Codes: C03B 23/027 with moulds having at least two upward pivotable mould sections
• CPC Class Codes: C03C 17/3441 comprising carbon, a carbide or oxycarbide

Abstract

The specification discloses a method for producing a curved glass member having a transparent, electroconductive coating by first coating the glass flat with indium-tin oxide, followed by coating that film with a layer of carbonaceous material and covering that layer with a mating piece of glass while the two pieces of glass are bent in a bending oven.

Claims

1. A method for forming a curved, electrically conductive glass member comprising:

coating a flat piece of glass with an indium-tin oxide coating;

applying a layer of carbonaceous material on top of said indium-tin oxide coating;

bending said glass member with heat while minimizing exposure of said carbonaceous layer to oxygen, whereby crazing of said indium-tin oxide coating is minimized.

2. The method of claim 1 in which said step of minimizing exposure of said carbonaceous layer to oxygen during bending is conducted by covering said carbonaceous layer with a second sheet of glass and bending said first and second sheets of glass together with heat with said indium-tin oxide and carbonaceous layers sandwiched between said first and second sheets of glass.

3. The method of claim 2 in which said carbonaceous material is applied to a density of approximately 0.6 of a gram per square foot.

4. The method of claim 3 in which said carbonaceous material is selected from the group consisting of powdered activated charcoal, powdered charcoal, powdered graphite and carbon black.

5. The method of claim 4 in which said carbonaceous material is incorporated into a paint and is applied to said indium-tin oxide layer in paint form.

6. The method of claim 4 in which said carbonaceous layer is dusted onto said indium-tin oxide layer.

7. The method of claim 4 in which said indium-tin oxide layer is applied to an initial light transmittance (T_o) of greater than about 40, said bending step being conducted without any firing of said indium-tin oxide layer in oxygen between said initial application step and said bending step.

8. The method of claim 4 in which said indium-tin oxide layer is applied on said glass to an initial light transmittance (T_o) of less than about 40;

said indium-tin oxide layer being fired in an atmosphere containing oxygen prior to said bending step.

9. The method of claim 4 in which said curved, electroconductive glass member is made without using a reduction cure step.

10. The method of claim 3 in which said indium-tin oxide layer is applied to an initial light transmittance (T_o) of greater than about 40, said bending step being conducted without any firing of said indium-tin oxide layer in oxygen between said initial application step and said bending step.

11. The method of claim 3 in which said indium-tin oxide layer is applied on said glass to an initial light transmittance (T_o) of less than about 40;

said indium-tin oxide layer being fired in an atmosphere containing oxygen prior to said bending step.

12. The method of claim 3 in which said curved, electroconductive glass member is made without using a reduction cure step.

13. The method of claim 2 in which said indium-tin oxide layer is applied to an initial light transmittance (T_o) of greater than about 40, said bending step being conducted without any firing of said indium-tin oxide layer in oxygen between said initial application step and said bending step.

14. The method of claim 2 in which said indium-tin oxide layer is applied on said glass to an initial light transmittance (T_o) of less than about 40;

said indium-tin oxide layer being fired in an atmosphere containing oxygen prior to said bending step.

15. The method of claim 2 in which said curved, electroconductive glass member is made without using a reduction cure step.

16. The method of claim 1 in which said indium-tin oxide layer is applied to an initial light transmittance (T_o) of greater than about 40, said bending step being conducted without any firing of said indium-tin oxide layer in oxygen between said initial application step and said bending step.

17. The method of claim 1 in which said indium-tin oxide layer is applied on said glass to an initial light transmittance (T_o) of less than about 40;

said indium-tin oxide layer being fired in an atmosphere containing oxygen prior to said bending step.

18. The method of claim 1 in which said curved, electroconductive glass member is made without using a reduction cure step.