Water soluble photochromic compounds, compositions and optical elements comprising the compounds
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United States of America Patent
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Jun 27, 2000
Issued Date -
N/A
app pub date -
Mar 5, 1999
filing date -
Dec 10, 1997
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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.
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