Compositions – Light transmission modifying compositions – Displaying color change
Patent
1994-11-28
1996-12-17
Chan, Nicky
Compositions
Light transmission modifying compositions
Displaying color change
549389, 549331, 524110, G02B 523, G02B 2700, C07D31192, C08K 515
Patent
active
055850421
ABSTRACT:
Described are novel reversible photochromic naphthopyran compounds substituted at the number eight carbon atom on the naphtho portion of the naphthopyran ring with, for example, a methoxy group. Also described are polymeric organic host materials that contain or that are coated with such compounds. Optically clear articles such as ophthalmic lenses or other plastic transparencies that incorporate the novel naphthopyran compounds or combinations thereof with complementary photochromic compounds, e.g., certain spiro(indoline)type compounds, are also described.
REFERENCES:
patent: 3562172 (1971-02-01), Ono et al.
patent: 3567605 (1971-03-01), Becker
patent: 3578602 (1971-05-01), Ono et al.
patent: 3627690 (1971-12-01), Casella et al.
patent: 4215010 (1980-07-01), Hovey et al.
patent: 4342668 (1982-08-01), Hovey et al.
patent: 4563458 (1986-01-01), Widdig et al.
patent: 4637698 (1987-01-01), Kwak et al.
patent: 4720356 (1988-01-01), Chu
patent: 4816584 (1989-03-01), Kwak et al.
patent: 4818096 (1989-04-01), Heller et al.
patent: 4826977 (1989-05-01), Heller et al.
patent: 4931221 (1990-06-01), Heller et al.
patent: 5066818 (1991-11-01), Van Gemert
patent: 5200116 (1993-04-01), Heller
patent: 5238981 (1993-08-01), Knowles
patent: 5244602 (1993-09-01), Van Gemert
patent: 5274132 (1993-12-01), Van Gemert
patent: 5340857 (1994-08-01), Van Gemert
patent: 5369158 (1994-11-01), Knowles
patent: 5384077 (1995-01-01), Knowles
patent: 5395567 (1995-03-01), Van Gemert et al.
Padwa et al, J. Org. Chem., vol. 40, No. 8, 1975, pp. 1142-1149.
Chan Nicky
Mallak Frank P.
Stein Irwin M.
Transitions Optical Inc.
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