Optical glass for mold pressing having softening capability at l

Details Optical glass for mold pressing having softening capability at l Optical glass for mold pressing having softening capability at l

1995-10-06

1997-03-04

Bell, Mark L.

Compositions: ceramic

Ceramic compositions

Glass compositions, compositions containing glass other than...

501 47, 501 48, 501 77, 501 79, 501903, C03C 3062

Patent

active

056078862

ABSTRACT:
An optical glass having optical constants of a refractive index (Nd) from 1.50 to 1.60 and an Abbe number (.nu.d) ranging from 62 to 73, a transformation temperature (Tg) of 550.degree. C. or below, and barely cracks or sticks to metal molds when the glass is subjected to mold pressing, maintains excellent chemical durability, and having softening capability at a low temperature which can be obtained by restricting the composition of the glass in weight percents within a specific range of a SiO.sub.2 --Al.sub.2 O.sub.3 --P.sub.2 O.sub.5 --R.sub.2 O system.

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patent: 4820662 (1989-04-01), Izumitani et al.
patent: 4929387 (1990-05-01), Hayden et al.

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