Photochromic naphthopyrans

Details Photochromic naphthopyrans Photochromic naphthopyrans

2001-12-13

2008-12-02

Andres, Janet L (Department: 1625)

Organic compounds -- part of the class 532-570 series

Organic compounds

Four or more ring nitrogens in the bicyclo ring system

C546S282100, C549S384000, C549S298000

Reexamination Certificate

active

07459555

ABSTRACT:
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)wherein n, R1, R2, R3, X, B and B′ are defined as in claim1. The inventive compounds are distinguished by good darkening and decolorizing properties and a very good service life.

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