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Phosphate sealing frits with improved H2O durability

  • US 20020128141A1
  • Filed: 03/16/2001
  • Published: 09/12/2002
  • Est. Priority Date: 12/21/2000
  • Status: Active Grant
First Claim
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1. A lead-free sub-pyrophosphate SnO—

  • ZnO—

    P2O5 glass composition, calculated in mole percent on an oxide basis, consisting essentially of;

    24.5 to 29.0% P2O5;

    1.2 to 5.0% B2O3;

    1.0 to 2.0% Al2O3;

    0.0 to 2.0% SiO2; and

    sufficient amounts of SnO and ZnO, wherein the molar ratio of SnO;

    ZnO is in the range of about 5.0;

    1 to 12;

    1, and wherein the glass composition exhibits, under NMR spectroscopic analysis of 11B nuclei, a signal containing at least two peaks at a chemical shift in the range of approximately −

    18 to −

    25 ppm.

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