Compositions – Light transmission modifying compositions – Displaying color change
Patent
1996-03-29
1998-05-19
Tucker, Philip
Compositions
Light transmission modifying compositions
Displaying color change
G02B 523
Patent
active
057531463
ABSTRACT:
Described are novel compositions of a carrier and at least two photochromic naphthopyran compounds, selected on the basis of specific criteria, that when exposed to solar ultraviolet radiation, exhibit neutral colors of gray or brown contained within the a* and b* ranges of +10 to -10 in the CIELAB color system. Also described are carriers, i.e., organic solvents and organic polymeric host materials, such as optically clear articles, e.g., ophthalmic lenses or other plastic transparencies that contain or that are coated with the naphthopyran compounds.
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Gemert Barry Van
Kish Delbert G.
Mallak Frank P.
Stein Irwin M.
Transitions Optical Inc.
Tucker Philip
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