High refractive index glasses of limited specific gravity for di

Details High refractive index glasses of limited specific gravity for di High refractive index glasses of limited specific gravity for di

1979-06-05

1980-07-22

McCarthy, Helen M.

Compositions: coating or plastic

Coating or plastic compositions

Metal-depositing composition or substrate-sensitizing...

106 52, 106 53, 106 54, C03C 304, C03C 308, C03C 310

Patent

active

042137870

ABSTRACT:
Optical glasses having high refractive indexes and low specific gravities are provided for use as both distant and near vision spectacle lenses. The glasses consist essentially of low molecular weight cationic oxides, alkali metal oxides and divalent oxides to promote the crystallization stability of the glass. They have good chemical resistance, chemical hardenability and a thermal expansion coefficient between 93 and 99.times.10.sup.-7 /.degree. C. in the range of 20.degree.-300.degree. C. Optical lenses can be continuously produced due to the high crystallization stability of the glasses and the resultant spectacle lenses have high dioptric values even with thinner edge or center thicknesses.

REFERENCES:
patent: 4084978 (1978-04-01), Sagara
patent: 4128432 (1978-12-01), Komorita et al.

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