Glazing unit

• US 4,284,677 A
• Filed: 04/24/1979
• Issued: 08/18/1981
• Est. Priority Date: 04/24/1979
• Status: Expired due to Term

• Current Assignee: LOF Glass Incorporated (Nippon Sheet Glass Company Limited)
• Original Assignee: Libbey-Owens-Ford Co. (Eaton Corporation PLC.)
• Inventors: Herliczek, Siegfried H.
• Primary Examiner(s): Robinson, Ellis P.
• Application Number:
  US06/032,810
• Time in Patent Office: 847 Days
• Field of Search: 428/437, 428/441, 428/501, 428/524, 428/426, 428/192, 428/195, 428/210, 428/200, 428/209, 428/521, 428/138, 428/433, 219/522, 219/203, 244/121, 244/129.3
• US Class Current: 428/192
• 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 17/1055 characterized by the resin layer, i.e. interlayer
• CPC Class Codes: B32B 17/10761 containing vinyl acetal
• CPC Class Codes: B32B 2307/202 Conductive
• CPC Class Codes: B32B 2307/412 Transparent
• CPC Class Codes: B32B 2605/18 Aircraft
• CPC Class Codes: B32B 27/08 of synthetic resin
• CPC Class Codes: B60J 1/007 received in frames to be attached to vehicle
• CPC Class Codes: B60J 1/10 fixedly mounted B60J1/085 takes precedence
• CPC Class Codes: B60J 10/70 specially adapted for windows or windscreens
• CPC Class Codes: Y10T 428/24331 including nonapertured component
• CPC Class Codes: Y10T 428/24777 Edge feature
• CPC Class Codes: Y10T 428/24843 with heat sealable or heat releasable adhesive layer
• CPC Class Codes: Y10T 428/24917 including metal layer
• CPC Class Codes: Y10T 428/24926 including ceramic, glass, porcelain or quartz layer
• CPC Class Codes: Y10T 428/3163 Next to acetal of polymerized unsaturated alcohol [e.g., formal butyral, etc.]
• CPC Class Codes: Y10T 428/31645 Next to addition polymer from unsaturated monomers
• CPC Class Codes: Y10T 428/31859 Next to an aldehyde or ketone condensation product
• CPC Class Codes: Y10T 428/31931 : Polyene monomer-containing
• CPC Class Codes: Y10T 428/31942 : Of aldehyde or ketone condensation product

Abstract

An electrically heated laminated aircraft glazing including at least two sheets of glass and an interposed non-brittle thermoplastic interlayer. A bus bar and an electrically conducting film are located on the inwardly disposed surface of one of the sheets and the bus bar covered with a thin layer of polyisobutylene resin. Additional layers of polyisobutylene resin are provided between the interlayer material and selected glass areas to prevent delamination and cold chipping of the glazing with subsequent moisture ingress and bus bar failure.

Claims

1. In an electrically conducting laminated glazing unit including at least two sheets of glass and an interposed plastic interlayer bonded to said sheets and in which said plastic interlayer and one of said glass sheets extends beyond an edge of the other of the sheets, a bus bar along the margin of an inwardly disposed surface of one of said sheets, a transparent electrically conducting film also on said surface and in contact with said bus bar, a first layer of polyisobutylene resin covering the area of the bus bar between said glass surface and the plastic interlayer, and a second layer of polysiobutylene resin disposed over the extended portion of said one glass sheet between the glass and the plastic interlayers, said resin layers comprising between 65 percent and 80 percent by weight of polyisobutylene with the remainder consisting essentially of carbon black and having a viscosity average molecular weight of between 8500 and 12000.

2. An electrically conducting laminated glazing unit comprising at least two glass panels, one of said panels having a greater surface area than the other of said panels, an interlayer of non-brittle thermoplastic material interposed between the glass panels and integrally bonded thereto to produce a unitary structure, said thermoplastic material extending outwardly beyond each of said glass panels and having a thickened portion substantially enclosing the edges of the glass panels, bus bars along opposite margins of the surface of the second mentioned or smaller panel facing the thermoplastic material, a transparent coating of electrically conducting material also on said surface and in contact with said bus bars, a layer of polyisobutylene resin covering each of the bus bars and margins of the said smaller panel and extending over onto the adjoining edges thereof, and an additional layer of polyisobutylene resin covering the margins of the first mentioned glass panel and extending over onto the adjoining edges thereof, with the last mentioned polyisobutylene layer covering all of the marginal area of the first mentioned panel extending beyond the periphery of the smaller panel, said resin layers comprising between 65 percent and 80 percent by weight of polyisobutylene with the remainder consisting essentially of carbon black and having a viscosity average molecular weight of between 8500 and 12000.

3. A laminated aircraft glazing unit including at least one sheet of glass and a layer of non-brittle thermoplastic material integrally bonded thereto over a surface of the sheet and extending outwardly beyond the glass sheet, a thickened portion on the extended part of said thermoplastic layer integrally bonded to an edge of said glass sheet, a strip of polyisobutylene resin tape between the glass sheet and the thermoplastic layer along a margin of said glass sheet adjacent said edge, and a second strip of polyisobutylene resin tape between said edge of the glass sheet and the thickened portion of the extended thermoplastic layer, said resin tapes comprising between 65 percent and 80 percent by weight of polyisobutylene with the remainder consisting essentially of carbon black and having a viscosity average molecular weight of between 8500 and 12000.