Diaryl-2h-napthopyrans

US5952515A · kind A · utility

Assignee

• Optische Werke G. Rodenstock · DE

Inventors

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

Key dates

• Filing date: Jul 30, 1997
• Grant date: Sep 14, 1999
• Expiry date: Jul 30, 2017

Classification

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

Abstract

The description concerns a photochromicsubstance, with a diaryl-2H-naphthopyrane having a link in the form Y--Ar, Z--Ar, Y--Ar--Y, Y--Ar--Y', Y--Ar--Z, Z--Ar--Z or Z--Ar--Z', in which Y, Y', Z and Z' are pyranes. The photochromic substance is also distinguished in that it has an aryl substituent which reduces the migration of the molecules in plastics.