Stabilized photochromic materials

Details Stabilized photochromic materials Stabilized photochromic materials

1975-01-24

1983-01-04

Lovering, Richard D.

Compositions

Light transmission modifying compositions

Displaying color change

106DIG6, 252316, 252385, 350354, 428403, 428404, 428406, 428913, 427222, G02B 523

Patent

active

043671705

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: 2649382 (1953-08-01), Vesce
patent: 3179600 (1965-04-01), Brockett
patent: 3190837 (1965-06-01), Brynko et al.
patent: 3362846 (1968-01-01), Lee et al.
patent: 3390933 (1968-07-01), Hovey et al.
patent: 3488290 (1970-01-01), Gerhardt et al.
Flinn et al.: "What is Happening in Microencapsulation", Chemical Engineering, Dec. 4, 1967, pp. 171-178.

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