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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
First Claim
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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.

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