Black pigment dispersion

US8674006B2 · kind B2 · utility

Assignee

• BASF SE Ludwigshafen · DE

Inventors

• Margherita Fontana · Basel, CH
• Marian Lanz · Moutier, CH
• Frank Oliver Heinrich Pirrung · Ludwigshafen am Rhein, DE
• Andreas GERNANDT · Ludwigshafen, DE
• Dario Perera · Basel, CH
• Thomas Ruch · Delémont, CH
• Christoph Krebs · Pratteln, CH
• Thomas Eichenberger · Basel, CH
• Bernd Lamatsch · Marly, CH

Key dates

• Filing date: Jan 7, 2010
• Grant date: Mar 18, 2014
• Expiry date: Sep 1, 2030

Classification

• Technology area (CPC G): Physics
• CPC primary: G02B5/223
• WIPO field: Basic materials chemistry
• WIPO sector: Chemistry

Abstract

Described is a pigment dispersion which is useful for electrophoretic displays comprising α) a bis-oxodihydro-indolylene-benzodifuranone colorant of the Formula (I) wherein the substituents are defined as in claim 1, β) a specific polymeric dispersant, and γ) a solvent which is suitable for dispersions used in electrophoretic displays. Also described are novel colourants and dispersants.