Photochromic composition

US5432049A · kind A · utility

Assignee

• Ciba-Geigy · US

Inventors

• Evelyn Fischer · Weil am Rhein, DE
• Walter Fischer · Reinach, CH
• Jurgen Finter · Glückstadt, DE
• Kurt Meier · Binningen, CH
• Martin Roth · Hölstein, CH

Key dates

• Filing date: Feb 1, 1994
• Grant date: Jul 11, 1995
• Expiry date: Feb 1, 2014

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10S430/163
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

Compounds of the formula I ##STR1## in which X is O, S, SO, SO.sub.2 or NR.sub.13, R.sub.13 is, for example, methyl, and R.sub.1 to R.sub.12, independently of one another, are, for example, H, C.sub.1 -C.sub.12 alkyl, C.sub.1 14 C.sub.12 alkoxy, halogen or --CN. The compounds are photosensitive and photochromic and as suitable are photosensitizers and simultaneously as colour indicators, and as photoswitchable colour filters.