Water soluble photochromic compounds, compositions and optical elements comprising the compounds
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United States of America Patent
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Mar 9, 1999
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N/A
app pub date -
Dec 10, 1997
filing date -
Dec 10, 1997
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Expired
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Abstract
Described are novel water soluble photochromic naphthopyran and benzopyran compounds having an alkylaminoalkylamino group on the naphtho- or benzo-portions and/or pyran portions thereof. These compounds may be represented by one of the following graphic formulae: ##STR1## wherein R.sub.1 is 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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