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Thin laminated glass for windscreen

  • US 10,343,378 B2
  • Filed: 10/22/2014
  • Issued: 07/09/2019
  • Est. Priority Date: 10/23/2013
  • Status: Active Grant
First Claim
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1. A laminated glazing comprising at least one outer glass sheet, an inner glass sheet and a polymeric insert located between the outer and inner glass sheets, in whichthe inner glass sheet has a thickness of not more than 1.5 mm,the outer glass sheet is a non-chemically reinforced glass sheet of different chemical composition from that of the inner glass sheet,a difference between the temperatures Tp1 and Tp2 being less than 80°

  • C., with temperature Tp1 being greater than temperature Tp2,wherein the temperature Tp1 is the average of the upper annealing temperature and the softening point of the outer glass sheet, and wherein the temperature Tp2 is the average of the upper annealing temperature and the softening point of the inner glass sheet, a general formula defining the temperature Tp being
    Tp=(Tsoftening+Tannealing)/2wherein the upper annealing temperature corresponding to the temperature at which a viscosity of a glass material is 1013 poises and the softening point corresponding to the temperature at which a viscosity of a glass material is 107.6 poises,wherein the laminated glazing is a bent glazing and constitutes a motor vehicle windshield,wherein a thickness of the outer glass sheet is greater than the thickness of the inner glass sheet, andwherein the polymeric insert has a thickness from 500 μ

    m to 4 mm.

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