Photochromic 3H-naphthopyrans

US5707557A · kind A · utility

Assignee

• Optische Werke G. Rodenstock · DE

Inventors

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

Key dates

• Filing date: Dec 20, 1996
• Grant date: Jan 13, 1998
• Expiry date: Dec 20, 2016

Classification

• Technology area (CPC G): Physics
• CPC primary: G02B5/23
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

Photochromic compounds with a 3H-naphthopyran structure having at least one pyrene moiety in the 3-position, a method for preparing such compounds, and the use of such compounds for producing photochromic articles from an organic synthetic material.