Stock material or miscellaneous articles – Surface property or characteristic of web – sheet or block – Surface modified glass
Patent
1979-10-19
1981-10-27
McCarthy, Helen M.
Stock material or miscellaneous articles
Surface property or characteristic of web, sheet or block
Surface modified glass
501 69, 3461351, 350354, 350362, 350398, 350406, 430 19, 430346, 430495, 430962, 428913, B32B 1700, G02F 300
Patent
active
042974178
ABSTRACT:
This invention is concerned with hydrated glass articles having base compositions within the Na.sub.2 O and/or K.sub.2 O-ZnO-Al.sub.2 O.sub.3 -SiO.sub.2 -Cl field and having at least a surface layer thereon containing Ag-AgCl crystals which impart photo-anisotropic effects to the glass articles. Silver ions are introduced into the surface layer through a solution ion exchange process with sodium and/or potassium ions of the parent glass. The silver remains in the ionic state until exposure to ultraviolet radiation which results in the development of silver-containing aggregates, i.e., Ag-AgCl, via a photolytic reaction. The aggregates contribute to photo-anisotropic absorption bands which are centered around 340 nm and 700 nm. Polarization of the photo-dichroic and photo-birefringent effects of the inventive products can be altered reversibly between two arbitrary directions without fatigue. The photo-anisotropic image can be read cyclically essentially indefinitely without destruction. The product of the invention is eminently suitable as a photosensitive medium for storing optical information.
REFERENCES:
patent: 3540793 (1970-11-01), Aravjo
patent: 4125404 (1978-11-01), Aravjo et al.
patent: 4160654 (1979-07-01), Bartholomew et al.
patent: 4191547 (1980-03-01), Wu
Corning Glass Works
Janes Jr. Clinton S.
McCarthy Helen M.
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