Use of improved cyan pigments in inkjet inks

US6406528B1 · kind B1 · utility

Assignee

• Clariant Corporation · DE

Inventors

• Hans-Tobias Macholdt · Darmstadt, DE
• Ruediger Baur · Niedernhausen, DE
• Eduard Michel · Frankfurt, DE
• Josef Geisenberger · Pocking, DE
• Heidemarie Menzel · Bad Soden, DE
• Andreas Harz · Schwalbach, DE

Key dates

• Filing date: Nov 16, 2001
• Grant date: Jun 18, 2002
• Expiry date: Nov 16, 2021

Classification

• Technology area (CPC G): Physics
• CPC primary: G02B5/22
• WIPO field: Basic materials chemistry
• WIPO sector: Chemistry

Abstract

The present invention relates to the use of a CuPc composition consisting essentially of CuPc, e.g., C.I. Pigment Blue 15:3, and a hydroxymethylphthalimido CuPc, as a colorant in electrophotographic toners and developers, powders and powder coating materials, electret materials, inkjet inks, and color filters, wherein the phthalocyanines have a particle morphology with an average length-to-width ratio of more than 2.5:1.