Substituted phenanthropyrans

The present invention relates to specific photochromic phenanthropyrans as well as to their use in synthetic resin materials of all types, especially for ophthalmic purposes. In particular, the present invention relates to photochromic compounds derived from 2H-phenanthro[2,1-b]pyrans and 3H-phenant...

Ausführliche Beschreibung

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Bibliographische Detailangaben
Hauptverfasser: MELZIG MANFRED, WEIGAND UDO, MANN CLAUDIA
Format: Patent
Sprache:eng
Schlagworte:
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