Laminated glazing unit having improved interfacial adhesion

• US 5,229,205 A
• Filed: 08/28/1991
• Issued: 07/20/1993
• Est. Priority Date: 12/20/1990
• Status: Expired due to Term

• Current Assignee: Automotive Components Holdings LLC (Ford Motor Company)
• Original Assignee: Ford Motor Company
• Inventors: Nietering, Kenneth E.
• Primary Examiner(s): Robinson, Ellis P.
• Assistant Examiner(s): Speer, Timothy M.
• Application Number:
  US07/751,377
• Time in Patent Office: 692 Days
• Field of Search: 428/437, 428/426, 428/432, 428/433, 428/480, 428/457, 428/469, 428/336, 428/688, 428/699, 428/701, 428/702, 428/212, 428/215, 428/216, 428/630, 428/632, 350/1.6, 350/1.7, 350/164, 350/166, 359/578, 359/580, 359/582, 219/202, 219/203
• US Class Current: 428/336
• CPC Class Codes: B32B 17/10005 laminated safety glass or glazing
• 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 17/10761 containing vinyl acetal
• CPC Class Codes: B32B 2367/00 Polyesters, e.g. PET, i.e. polyethylene terephthalate
• CPC Class Codes: C03C 17/36 at least one coating being a metal
• CPC Class Codes: C03C 17/3615 Coatings of the type glass/metal/other inorganic layers, at least one layer being non-metallic
• CPC Class Codes: C03C 17/3639 Multilayers containing at least two functional metal layers
• CPC Class Codes: C03C 17/3644 the metal being silver
• CPC Class Codes: C03C 17/3652 the coating stack containing at least one sacrificial layer to protect the metal from oxidation
• CPC Class Codes: C03C 17/366 Low-emissivity or solar control coatings
• CPC Class Codes: C03C 17/3673 specially adapted for use in heating devices for rear window of vehicles
• CPC Class Codes: C03C 17/3681 the multilayer coating being used in glazing, e.g. windows or windscreens
• CPC Class Codes: H05B 2203/013 Heaters using resistive films or coatings
• CPC Class Codes: H05B 3/86 the heating conductors being embedded in the transparent or reflecting material H05B3/845 takes precedence
• CPC Class Codes: Y10T 428/12597 Noncrystalline silica or noncrystalline plural-oxide component [e.g., glass, etc.]
• CPC Class Codes: Y10T 428/12611 Oxide-containing component
• CPC Class Codes: Y10T 428/265 1 mil or less
• CPC Class Codes: Y10T 428/31678 Of metal
• CPC Class Codes: Y10T 428/31786 Of polyester [e.g., alkyd, etc.]

Abstract

A glazing unit comprises a substrate ply and a laminating ply laminated to a surface of the substrate ply. A coating on the laminated surface of the substrate ply is a film stack comprising an electrically conductive film of silver metal covered by a tantalum pentoxide dielectric film immediately adjacent the laminating ply. Between the silver film and the tantalum pentoxide film is an adhesion film of metal selected from zinc and copper. Applications include, for example, glazing units for solar load reduction and electrically heated glazing units.

Claims

1. A motor vehicle glazing unit comprising a PVB laminating ply sandwiched between two glass plys, a substantially transparent, electrically conductive film stack at an interface between the PVB laminating ply and one of the two glass plys, and means for passing an electrical current through the film stack to heat the windshield, the film stack consisting essentially of a tantalum pentoxide dielectric film about 35 to 50 nm thick adjacent the PVB laminating ply, an adhesion film of copper or zinc about 1 to 4 nm thick over the tantalum pentoxide dielectric film, a silver metal film about 7 to 12 nm thick over the adhesion film;

a second adhesion film of copper or zinc about 1 to 4 nm thick over the silver metal film; and

a second dielectric film of tantalum pentoxide about 35 to 50 nm thick over the second adhesion film.

2. A laminated glazing unit comprising a glass substrate ply having a surface, a polymeric laminating ply, and a substantially transparent solar load reduction coating on the surface of the substrate ply laminated between the glass substrate ply and the polymeric laminating ply, the coating consisting essentially of, in order, a tantalum pentoxide dielectric film adjacent the polymeric laminating ply, an adhesion film of copper or zinc, a first film of silver metal, a second dielectric film, a second film of silver metal, and a third dielectric film adjacent the substrate ply and means for passing an electrical current through the solar load reduction coating to heat the window.