Charged particles

US9403987B2 · kind B2 · utility

Assignee

• BASF SE

Inventors

• Pascal Hayoz · Therwil, CH
• Bernd Lamatsch · Marly, CH
• Margherita Fontana · Basel, CH
• Stephan Burkhardt · Gelterkinden, CH
• Laurent Michau · Pfetterhouse, FR
• Urs Lehmann · Basel, CH
• Philippe Bugnon · Le Mouret, CH

Key dates

• Filing date: Jun 11, 2010
• Grant date: Aug 2, 2016
• Expiry date: Dec 30, 2032

Classification

• Technology area (CPC G): Physics
• CPC primary: G02F2001/1678
• WIPO field: Basic materials chemistry
• WIPO sector: Chemistry

Abstract

Disclosed is a composition comprising a charged particle of volume 5 nm3 to 50 million nm3 preferably having an inorganic core of SiO2, AI2O3, and/or TiO2, or a core essentially consisting of an organic pigment and/or pigment derivative, and a counter ion which is separable from the particle and is not covalently linked to the particle, said counter ion comprising a silicon atom which is directly bound to a carbon atom. Preferably, said charged particle comprises a dye attached to said inorganic core and said counter ion comprises a (poly)siloxane moiety linked via suitable bridge members to a quaternary, positively charged, nitrogen or phosphorus atom, or to a moiety carrying an anionic functional group. Said composition may be used e.g. in the form of a homogenous dispersion in an electrophoretic display.