Stock material or miscellaneous articles – Surface property or characteristic of web – sheet or block – Surface modified glass
Patent
1979-06-28
1980-07-15
Vertiz, O. R.
Stock material or miscellaneous articles
Surface property or characteristic of web, sheet or block
Surface modified glass
106 47Q, 106DIG6, 106 52, 65 30E, C03C 2100, C03C 320, C03C 304
Patent
active
042129192
ABSTRACT:
This invention is concerned with the production of chemically strengthened polychromatic glasses. In the preferred embodiment, the glasses are suitable for ophthalmic applications, i.e., the glasses have a refractive index of at least 1.523 and, after chemical strengthening, will exhibit a surface compression layer having a depth of at least 0.002", a maximum central tension of at least 0.7 kg/mm.sup.2, and a modulus of rupture of at least approximately 30,000 psi such as to pass the FDA strength requirements for glass ophthalmic lenses. For this preferred embodiment, the chemical strengthening reaction will be conducted for a period not exceeding about 24 hours and the glasses will have compositions consisting essentially, by weight on the oxide basis as calculated from the batch of about 11-18% Na.sub.2 O, 60-70% SiO.sub.2, 3-12% ZrO.sub.2, 0-18% ZnO and/or 0-14% Al.sub.2 O.sub.3, the total ZnO+Al.sub.2 O.sub.3 not exceeding about 20%, 0-5% BaO, 0.005-0.3% Ag, 0.01-0.2% CeO.sub.2, 1-4% F, and an amount of at least one halide selected from the group of Cl, Br, and I sufficient to react stoichiometrically with the Ag, but not more than about 3%.
REFERENCES:
patent: 3485702 (1969-12-01), Mochel
patent: 3790430 (1974-02-01), Mochel
patent: 4017318 (1977-04-01), Pierson et al.
patent: 4092139 (1978-05-01), Ference
patent: 4118214 (1978-10-01), Wedding
Bell Mark
Corning Glass Works
Janes Jr. Clinton S.
Vertiz O. R.
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