Compositions – Light transmission modifying compositions – Displaying color change
Patent
1999-03-05
2000-06-27
McPherson, John A.
Compositions
Light transmission modifying compositions
Displaying color change
359642, 549389, 549404, 549 48, 549 58, 549 60, 549366, 546165, 546176, 546196, 5462827, 548444, 548454, C08K 515, C07D31192, C07D31104, G02B 523
Patent
active
06080338&
ABSTRACT:
Described are novel water soluble photochromic naphthopyran and benzopyran compounds having an alkylaminoalkylamino group on the pyran portion or on the pyran portion and the naphtho- or benzo-portion thereof. These compounds may be represented by one of the following graphic formula: ##STR1## wherein B and/or B' is an alkylaminoalkylamino-substituted aryl group and R.sub.1 may also be an alkylaminoalkylamino group. Articles such as ophthalmic lenses or other plastic transparencies and coating compositions such as paints and inks that incorporate the novel water soluble compounds are also described.
REFERENCES:
patent: 4818096 (1989-04-01), Heller et al.
patent: 5066818 (1991-11-01), Gemert et al.
patent: 5384077 (1995-01-01), Knowles
Mallak Frank P.
McPherson John A.
Stein Irwin M.
Transitions Optical Inc.
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