Glass manufacturing – Processes – With chemically reactive treatment of glass preform
Patent
1984-09-17
1985-08-27
Schor, Kenneth M.
Glass manufacturing
Processes
With chemically reactive treatment of glass preform
501 13, C03C 2100, C03C 326
Patent
active
045376123
ABSTRACT:
This invention is directed to a method for modifying the coloration produced in a silver halide-containing photochromic glass when heat treating the glass at a temperature not exceeding 450.degree. C. under reducing conditions. The method comprises subjecting such a glass having a base composition which contains at least 1% by weight Li.sub.2 O, at least 2% by weight Na.sub.2 O, and at least 6% by weight Li.sub.2 O+Na.sub.2 O+K.sub.2 O to an ion exchange reaction, wherein lithium ions, and potassium ions, when the latter are present in the composition, in the glass surface are exchanged with sodium ions from an external source, prior to the reduction heat treatment.
REFERENCES:
patent: 4018965 (1977-04-01), Kerko et al.
patent: 4240836 (1980-12-01), Borrelli et al.
patent: 4284686 (1981-08-01), Wedding
Kozlowski et al.; American Journal of Optometry, vol. 50, No. 4, Apr. 1973, pp. 79-88.
Borrelli Nicholas F.
Hares George B.
Smith Dennis W.
Wedding Brent M.
Corning Glass Works
Janes, Jr. C. S.
Schor Kenneth M.
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