Photochromic naphthopyrans

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United States of America Patent

PATENT NO 7459555
APP PUB NO 20020052499A1
SERIAL NO

10013518

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Abstract

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The present invention relates to photochromic 2H-naphtho[1,2-b]pyrans as well as their use in synthetic resins of all types, especially for ophthalmic purposes. In particular, the present invention relates to photochromic naphthopyran compounds, for which a further ring system is bonded to the f side of the naphthopyran. The inventive photochromic dyes generally have the general formula (I) ##STR00001## wherein n, R.sub.1, R.sub.2, R.sub.3, X, B and B' are defined as in claim 1. The inventive compounds are distinguished by good darkening and decolorizing properties and a very good service life.

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Patent Owner(s)

Patent OwnerAddress
RODENSTOCK GMBHELSENHEIMERSTR 33 MÜNCHEN 80687

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Mann, Claudia Munich, DE 16 175
Melzig, Manfred Wessling, DE 42 566
Weigand, Udo Munich, DE 28 188

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