Barium borosilicate optical glasses

Details Barium borosilicate optical glasses Barium borosilicate optical glasses

1974-12-06

1976-06-22

Garvin, Patrick P.

Compositions: coating or plastic

Coating or plastic compositions

Metal-depositing composition or substrate-sensitizing...

106 53, 106 54, 106 732, C03C 300

Patent

active

039649180

ABSTRACT:
A dense barium borosilicate glass is disclosed having a refractive index greater than 1.64 and a dispersive index of at least 53, together with a high degree of chemical durability such that optical blanks molded from the glass can be finished on automatic machinery with minimal danger of staining. The glass consists essentially of 18-30% SiO.sub.2, 8-22% B.sub.2 O.sub.3, 25-48% BaO, 0-10% other divalent metal oxides, 25-45% total divalent metal oxides, 10-30% La.sub.2 O.sub.3, 0-6% ZrO.sub.2 and/or SnO.sub.2, with the mole ratio of BaO:SiO.sub.2 not exceeding 0.6 and preferably not exceeding 0.5.

REFERENCES:
patent: 2406580 (1946-08-01), Bastick
patent: 2518028 (1950-08-01), Kreidl
patent: 2523362 (1950-09-01), Fraser
patent: 2702749 (1955-02-01), Hafner
patent: 3248238 (1966-04-01), Faulstich
patent: 3460954 (1969-08-01), Young
patent: 3503764 (1970-03-01), Young
patent: 3513004 (1970-05-01), Kohut
patent: 3536504 (1970-10-01), Faulstich et al.
patent: 3726698 (1973-04-01), Hares et al.
patent: 3740242 (1973-06-01), Faulstich et al.

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