Electrostatic toners containing a metal complex dye as charge stabilizer

US5529872A · kind A · utility

Assignee

• BASF SE

Inventors

• Klaus Grychtol · Bad Dürkheim, DE
• Karin H. Beck · Ludwigshafen, DE
• Rainer Dyllick-Brenzinger · Speyer, DE

Key dates

• Filing date: Feb 17, 1995
• Grant date: Jun 25, 1996
• Expiry date: Feb 17, 2015

Classification

• Technology area (CPC G): Physics
• CPC primary: G03G9/091
• WIPO field: Basic materials chemistry
• WIPO sector: Chemistry

Abstract

An electrostatic toner contains a polymeric binder and as charge stabilizer a 1:2 chromium, iron, cobalt or zirconium complex of azo dyes of the formula D--N.dbd.N--K, where D is derived from a diazo component D--NH.sub.2 selected from the group consisting of 2-amino-4-nitrophenol, 2-amino-5-nitrophenol, 2-amino-phenol-4-sulfonamide, anthranilic acid and picramic acid and K is derived from a coupling component K--H selected from the group consisting of .beta.-naphthol, acetoacetanilide and 1-phenyl-3-methylpyrazol-5-one.