Compositions – Light transmission modifying compositions – Displaying color change
Patent
1994-04-08
1995-11-07
Chan, Nicky
Compositions
Light transmission modifying compositions
Displaying color change
549384, G02B 523, C07D31178
Patent
active
054645670
ABSTRACT:
Described are novel reversible photochromic naphthopyran compounds which have two phenyl moieties adjacent to each oxygen of each pyran ring. The substituents on each pair of phenyl moieties mirror one another when the phenyl groups are substituted. The naphthodipyrans are prepared from .beta.,.beta.-dihydroxynaphthalene compounds.
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patent: 4826977 (1989-05-01), Heller et al.
Padwa et al., J. Org. Chem., vol. 40, No. 8, 1975, p. 1142.
Gemert Barry V.
Knowles David B.
Chan Nicky
Stein Irwin M.
Transitions Optical Inc.
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