NIR dyes, methods of preparing them and their use

US5266699A · kind A · utility

Assignee

• Ciba-Geigy · US

Inventors

• Rudolf Naef · Lupsingen, CH
• Beat Schmidhalter · Bubendorf, CH
• Hanspeter Preiswerk · Birsfelden, CH

Key dates

• Filing date: Oct 26, 1992
• Grant date: Nov 30, 1993
• Expiry date: Oct 26, 2012

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C09B11/26
• WIPO field: Basic materials chemistry
• WIPO sector: Chemistry

Abstract

The compounds of the formula I ##STR1## in which Y and Y.sub.1 are each, independently of one another, O, S, NH or N-alkyl, N-cycloalkyl, PA1 N-phenyl or N-benzyl, or Y and Y.sub.1 are together N-alkylene-N, PA1 R and R.sub.1 are each, independently of one another, H, alkyl, cycloalkyl, aralkyl or aryl, PA1 R.sub.2 and R.sub.3 are each, independently of one another, H, or R.sub.2 forms, together with R.sub.6 and the N and C atoms linking them, a 5- or 6-membered ring and R.sub.3 is H, or R.sub.3 forms, together with R.sub.7 and the N and C atoms linking them, a 5- or 6-membered ring and R.sub.2 is H, PA1 R.sub.4 and R.sub.5 are each, independently of one another, H, or R.sub.4 forms, together with R.sub.8 and the N and C atoms linking them, a 5- or 6-membered ring and R.sub.5 is H, or R.sub.5 forms, together with R.sub.9 and the N and C atoms linking them, a 5- or 6-membered ring and R.sub.4 is H, PA1 R.sub.6, R.sub.7, R.sub.8 and R.sub.9 are each, independently of one another, H, alkyl, cycloalkyl, aralkyl or aryl, or R.sub.6 and R.sub.8 and/or R.sub.7 and R.sub.9 form, together with the N atom linking them, a piperidine radical, a morpholine radical or an unsubstituted piperazine…