Compositions: ceramic – Ceramic compositions – Glass compositions – compositions containing glass other than...
Patent
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
Nagamine Izumi
Nozawa Nobuhiro
Bell Mark L.
Kabushiki Kaisha Ohara
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