Compositions – Inorganic luminescent compositions – Tungsten containing
Patent
1974-12-23
1979-08-28
Padgett, Benjamin R.
Compositions
Inorganic luminescent compositions
Tungsten containing
106194, 106DIG6, 252385, 260 4214, 260 37PC, 260 37R, 428403, 428404, 428406, 428413, 428913, G02B 523
Patent
active
041660439
ABSTRACT:
Organic photochromic materials comprising a photochromic dye and a resinous material can be stabilized with a protective coating which will protect them from deactivation by exposure to moisture, oxygen, various plastic host materials, reactive chemicals or even normal atmospheric conditions. Useful organic photochromic dyes include the spiropyrans, the spirooxazines, the metal dithizonates, the phenazines, the phenothiazines and other known photochromic compositions. Useful resinous materials include vinyl-type thermoplastics, cellulosic materials, polyesters, epoxy resins and aminoplast resins. The encapsulated photochromic materials of the invention comprise an organic photochromic dye in combination with an organic resinous material enclosed within an outer shell of an inorganic material and find use in the preparation of photochromic plastic films, sheets, ophthalmic lenses such as lenses for sunglasses and in camera lenses and filters.
REFERENCES:
patent: 1833640 (1931-11-01), Fruth
patent: 3582384 (1971-06-01), Belde et al.
patent: 3716489 (1973-02-01), De Lapp
patent: 3767455 (1973-10-01), Claridge et al.
Flinn et al., "What is Happening in Microencapsulation", Chemical Engineering, Dec. 4, 1967, pp. 171-178.
Perry, J. H. Ed., Chemical Engineers Handbook, McGraw-Hill Book Co., Inc., New York, 1950, pp. 383, 1143-1145.
Chu Nori Y. C.
Fournier, Jr. Joseph T.
Hovey Richard J.
Snitzer Elias
Uhlmann Donald R.
American Optical Corporation
Duggan Jeremiah J.
Kyle Deborah L.
Padgett Benjamin R.
Schneeberger Stephen A.
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