Ophthalmic and optical glass

Details Ophthalmic and optical glass Ophthalmic and optical glass

1987-05-28

1988-03-22

Bell, Mark L.

Compositions: ceramic

Ceramic compositions

Glass compositions, compositions containing glass other than...

501901, 501903, C03C 3068, C03C 400

Patent

active

047328762

ABSTRACT:
An Ophthalmic and optical glass which is a B.sub.2 O.sub.3 - SiO.sub.2 - Li.sub.2 O - CaO - La.sub.2 O.sub.3 - TiO.sub.2 - ZrO.sub.2 -Nb.sub.2 O.sub.5 system in which relatively large amounts of B.sub.2 O.sub.3 and La.sub.2 O.sub.3 ingredients coexist has improved resistivity to devitrification while maintaining desirable optical constants, i.e., a refractive index (.eta.d) in the range of 1.75 to 1.84, Abbe number (.nu.d) in the range of 33 to 40 and specific gravity of 4.0 or less. Besides, the range of content of the Li.sub.2 O ingredient which is effective for the chemical strengthening treatment can be enlarged by this system of glass.

REFERENCES:
patent: 4057435 (1977-11-01), Boudot et al.
patent: 4213786 (1980-07-01), Faulstich et al.
patent: 4213787 (1980-07-01), Faulstich et al.
patent: 4390638 (1983-06-01), Mennemann et al.
patent: 4612295 (1986-09-01), Sagara

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