Substituted phenanthropyrans

US7229576B2 · kind B2 · utility

Assignee

• RODENSTOCK GMBH · DE

Inventors

• Claudia Mann · Munich, DE
• Manfred Melzig · Weßling, DE
• Udo Weigand · Munich, DE

Key dates

• Filing date: Mar 17, 2006
• Grant date: Jun 12, 2007
• Expiry date: Mar 17, 2026

Classification

• Technology area (CPC G): Physics
• CPC primary: G02C7/102
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

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-phenanthro[3,4-b]pyrans, which in the open form have especially long wavelength absorption maxima, but in the unexcited state are still colorless.