Diaryl-2H-naphthopyrans

US6190580A · kind A · utility

Assignee

• Optische Werke G. Rodenstock · DE

Inventors

• Manfred Melzig · Weßling, DE
• Herbert Zinner · Pentling, DE

Key dates

• Filing date: Nov 23, 1999
• Grant date: Feb 20, 2001
• Expiry date: Nov 23, 2019

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C09K9/02
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

Photochromic diaryl-2H-naphthopyran structures, which dye photochromically well at room temperature, lighten up quickly when incorporated into ophthalmic lenses, possess longevity, and due to their special structure, have a reduced tendency of the molecules to migrate in plastics.