Glass with high refractive index and low density

Details Glass with high refractive index and low density Glass with high refractive index and low density

1978-09-11

1979-04-17

Vertiz, O. R.

Compositions: coating or plastic

Coating or plastic compositions

Metal-depositing composition or substrate-sensitizing...

106 47Q, 106 54, C03C 304, C03C 308

Patent

active

041498950

ABSTRACT:
The instant invention relates to glasses suitable for optical and ophthalmic applications which can be melted and formed utilizing continuous commercial processes. The glasses exhibit indices of refraction between about 1.675-1.720, densities between about 3.1-3.4 g/cm.sup.3, Abbe numbers between about 33-36.5, viscosities at the liquidus temperature of at least about 220 poises, and very high chemical durability as evidenced by a loss of weight of less than 0.01 mg/cm.sup.2 in the American Optical test. The glasses consist essentially, in weight percent on the oxide basis, of 40-46% SiO.sub.2, 0-3% Al.sub.2 O.sub.3, 40-46% SiO.sub.2 +Al.sub.2 O.sub.3, 13-17% TiO.sub.2, 4-11% ZrO.sub.2, 0-2% MgO, 3-7% CaO, 4-8% CaO+MgO, 8-16% BaO, 0-4% SrO, 15-25% CaO+BaO+SrO, 2-10% Nb.sub.2 O.sub.5, 0-3% Li.sub.2 O, 2-7% Na.sub.2 O, 3-8% K.sub.2 O, 5-12% Li.sub.2 O+Na.sub.2 O+K.sub.2 O.

REFERENCES:
patent: 3870531 (1975-03-01), Jahn
patent: 4055435 (1977-10-01), Sagac

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