Photochromic microsheet

Details Photochromic microsheet Photochromic microsheet

1978-07-26

1979-09-18

Robinson, Ellis P.

Stock material or miscellaneous articles

Structurally defined web or sheet

Physical dimension specified

65DIG2, 106 53, 106 54, 106DIG6, 350205, 350354, 351163, 351164, 351165, 428412, 428426, 428430, 428913, B32B 702, B32B 2736, G02B 300

Patent

active

041683390

ABSTRACT:
This invention is directed to the production of photochromic glass microsheet which is particularly useful in the fabrication of transparent glass-plastic composite lenses. In such lenses, the photochromic microsheet will either be buried within the plastic or will act as a surface layer thereon. The microsheet consists essentially, in weight percent on the oxide basis as calculated from the batch, of 54-66% SiO.sub.2, 7-15% Al.sub.2 O.sub.3, 10-30% B.sub.2 O.sub.3, 3-15% Na.sub.2 O, 0.4-1.5% PbO, 0.2-0.5% Br, 0.5-1.2% Cl, 0.2-0.5% F, 0.008-0.03% CuO, and >0.03%-1% Ag.

REFERENCES:
patent: 3197296 (1965-07-01), Eppler
patent: 3208860 (1965-09-01), Armistead
patent: 3252374 (1966-05-01), Stookey
patent: 3338696 (1967-08-01), Dockerty
patent: 3449103 (1969-06-01), Stookey
patent: 3682609 (1972-08-01), Dockerty
patent: 3795523 (1974-03-01), Moriya
patent: 3833511 (1974-09-01), Yamashita
patent: 4018965 (1977-04-01), Kerko
patent: 4035527 (1977-07-01), Deeg
patent: 4130437 (1978-12-01), Mazeau

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