Laminated glass with an electroconductive layer

• US 5,324,374 A
• Filed: 10/02/1992
• Issued: 06/28/1994
• Est. Priority Date: 07/27/1988
• Status: Expired due to Fees

• Current Assignee: Saint Gobain Vitrage (Compagnie De Saint-Gobain S.A.)
• Original Assignee: Saint Gobain Vitrage (Compagnie De Saint-Gobain S.A.)
• Inventors: Oudard, Jean-Francois, Bruneel, Dominique, Harmand, Helene
• Primary Examiner(s): Ball, Michael W.
• Assistant Examiner(s): Lorin, Francis J.
• Application Number:
  US07/956,543
• Time in Patent Office: 634 Days
• Field of Search: 156/99, 156/100, 156/102, 156/104, 156/106, 65/60.1, 65/60.5, 65/60.51, 65/60.53, 219/203, 219/522, 427/108, 427/126.2, 427/163, 427/165
• US Class Current: 156/102
• CPC Class Codes: B32B 17/10036 comprising two outer glass sheets
• CPC Class Codes: B32B 17/10174 Coatings of a metallic or dielectric material on a constituent layer of glass or polymer
• CPC Class Codes: B32B 17/10293 Edge features, e.g. inserts or holes
• CPC Class Codes: B32B 17/10339 Specific parts of the laminated safety glass or glazing being colored or tinted tinted glass sheet B32B17/1011; tinted interlayer B32B17/10651
• CPC Class Codes: H01Q 1/1271 for mounting on windscreens

Abstract

A laminated glazing is prepared by a providing an electroconductive layer on side 3, the sides of such a glazing being conventionally numbered from 1-4 starting from the outside of the glazing when mounted on a vehicle, towards the inside. The electroconductive layer is formed by powder deposition and pyrolysis to form a ITO layer on a glass pane, which is subsequently bent such that the surface bearing the ITO layer is convex. This glass is laminated with a glass of the same curvature, between which panes is sandwiched a plastic interlayer. On the side of the interlayer facing the electroconductive layer, current lead strips, in the form of metal tinsel, are provided, such that upon lamination, the metal lead strips are in electrical contact with the electroconductive layer and lead to a source of electricity. The resulting window is produced more simply, more reliably, and exhibits improved defogging.

Claims

1. A method of forming a laminated glazing, which comprises:

forming an electroconductive indium tin oxide (ITO) layer by pyrolysis of a mixture of powdered indium and tin compounds on a side of a first glass sheet which is to serve as side three of said laminated glazing formed of two glass sheets and having sides 1, 2, 3 and 4 starting from the outside toward the inside of a vehicle in which the glazing is to be mounted;

reducing the electroconductive ITO layer;

applying a layer of enamel along the peripheries of sides 4 and 2 of said glass sheets;

bending each of the two glass sheets into a shape desired for mounting on said vehicle such that side 3 of said first glass sheet is bent into a convex shape;

contacting the second of said two glass sheets with said first glass sheet having said electroconductive layer thereon so that said electroconductive layer is between said glass sheets and positioning a thermoplastic sheet having electrical current leading strips fixed thereon such that upon lamination in the next step, the leading strips come into contact with said electroconductive layer on the edges of said first glass sheet, between said glass sheets; and

laminating the combined glass sheets under heat and pressure to prepare a glazing for said vehicle.

2. The method of claim 1, wherein the pyrolized layer, upon bending of the laminated glass sheet has a homogenous thickness over the entire surface thereby exhibiting a homogenous electrical resistance over its entire surface.

3. The method of claim 1, wherein said electrical current leading strips are positioned on said electroconductive layer prior to lamination of the glass sheets.

4. The method of claim 1, which comprises applying the electroconductive layer of indium-tin oxide to a minimum thickness of about 180 nm on said glass sheet.

5. The method of claim 1, wherein said mixture of indium and tin compounds is a mixture of indium formate and dibutyl tin oxide.

6. The method of claim 1, wherein said second glass sheet is tinted to a greenish color by cobalt oxide, iron oxide or combinations thereof.