Optics: eye examining – vision testing and correcting – Spectacles and eyeglasses – Ophthalmic lenses or blanks
Patent
1987-06-17
1989-04-04
Thexton, Matthew A.
Optics: eye examining, vision testing and correcting
Spectacles and eyeglasses
Ophthalmic lenses or blanks
350354, 252586, G02B 2700, C07D26500, G03C 1733
Patent
active
048180963
ABSTRACT:
Photoreactive plastics lenses are disclosed which are coated or impregnated with an adamantane 2-spiro-benzo or naphthopyran and with a blue coloring photochromic benzo- or naphthopyran having a nitrogen containing substituent in the 2-position in the pyran ring. The lenses darken in sunlight and fade rapidly at ambient temperatures in the dark or in white light which does not contain a U.V. component. The combination of the yellow/orange coloring adamantane 2-spiro pyran compound with the purple/blue coloring pyran gives a desired brown/grey coloration in the sunlight-darkened lens. The invention includes novel blue-coloring pyran compounds in which the nitrogen-containing substituent in the 2-position is a phenyl group having an amino or substituted amino or nitrogen-containing heterocyclic substituent in the ortho- or para-position of the phenyl group.
The basic chromene structure and the suffix N will be used to distinguish the blue-coloring pyran compounds having a nitrogen-containing substituent, namely: ##STR1##
REFERENCES:
patent: 2542386 (1951-02-01), Beattie
patent: 3231584 (1966-01-01), Berman
patent: 3404861 (1966-02-01), Ewer
patent: 3567605 (1971-03-01), Becker
patent: 3627690 (1971-12-01), Casella et al.
patent: 3944637 (1976-03-01), Bond et al.
J. Org. Chem., vol. 40, No. 8, 1975, pp. 1142-1149, Albert Padwa, "Photochemical Ring-Opening Reactions of Substituted Chromenes and Isochromenes".
Baskerville Martin W.
Brettle Jack
Heller Harry G.
Oliver Stephen N.
Trundle Clive
Kilby Catherine S.
The Plessey Company PLC
Thexton Matthew A.
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