Matchable low-E I.G. units and laminates and methods of making same

  • US 20030101749A1
  • Filed: 09/19/2002
  • Published: 06/05/2003
  • Est. Priority Date: 12/06/1999
  • Status: Active Grant
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First Claim
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1. In a glass article having at least two glass substrates in light transmitting communication with each other and having a sputter coated heat treatable layer system on at least one of said substrates, which coated substrate is heat treated, the improvement comprising said glass article being matchable and wherein said sputter coated layer system comprises from the glass substrate on which it is coated, outwardly:

  • a) a layer of silicon nitride;

    b) a substantially metallic layer of nickel or nickel alloy having a nickel content of at least about 10% by weight Ni, said layer being substantially free of a nitride or oxide of said metal;

    c) a substantially metallic layer of silver;

    d) a substantially metallic layer of nickel or a nickel alloy having a nickel content of at least about 10% by weight Ni, said layer being substantially free of a nitride or oxide of said metal; and

    e) a layer of silicon nitride;

    wherein said heat treated layer coating system has a visible transmittance at least 4% greater than before it was heat treated; and

    wherein the relative thicknesses of said layers combine to result in said heat treated coated substrate which when viewed monolithically from the glass side of said coating has a Δ

    E*ab less than 5.0 and a Δ

    a* less than about 0.8.

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