Patent ID: 6737375
Filing Date: 2004-05-18
Classification: C03C,G02B

Abstract:
A lead-free sub-pyrophoshate SnOâ€”ZnOâ€”P2O5 glass composition, in mole percent on an oxide basis, consisting essentially of about: 24.5-29.0% P2O5; 1-5% B2O3; 1-2% Al2O3, 0-2% SiO2, 51.5-66.5% SnO, 5-12% ZnO, wherein the mole ratio of SnO:ZnO is in the range of about 5:1 to 12:1, and under NMR spectroscopic analysis of 11B nuclei, the glass composition exhibits a profile having a peak centered at about âˆ’10 ppm (BO3), and at least two peaks in the range of about âˆ’15 ppm to about âˆ’30 ppm.