Photochromic naphtopyrane colorants, method for the production and use thereof, photochromic object

US6146554A · kind A · utility

Assignee

• Optische Werke G. Rodenstock · DE

Inventors

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

Key dates

• Filing date: May 21, 1999
• Grant date: Nov 14, 2000
• Expiry date: May 21, 2019

Classification

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

Abstract

What is described here are photochromic naphthopyrane dyes with different substituents whose properties can be set by controlled selection of the substituents. In this manner it is possible to take an influence on the migration characteristics, the absorption characteristics and the brightening rate and kinetics. The inventive compounds display good darkening and brightening properties at a very good service life. The invention excels itself by the fact that a method is made available which is substantially improved over prior art, in addition to the surprising influence on specific properties of the inventive compounds. The described compounds are suitable for application in synthetic materials of any kind. A photochromic object is also the subject matter of the invention, which comprises one or several photochromic naphthopyrane dyes as well as at least one polymer material, with the photochromic object being producible by mass-dyeing or superficial dyeing.