Multilayer cholesteric pigments

US6582781B1 · kind B1 · utility

Assignee

• BASF SE

Inventors

• Peter Schuhmacher · Mannheim, DE
• Norbert Schneider · Schorndorf, DE
• Volker Richter · Neutraubling, DE
• Harald Keller · Ludwigshafen, DE
• Gunter Bettinger · Schifferstadt, DE
• Peter Blaschka · Ludwigshafen, DE
• Peter Heilmann · Bad Dürkheim, DE
• Frank Meyer · Mannheim, DE
• Wolfgang Best · Freinsheim, DE

Key dates

• Filing date: Mar 2, 2000
• Grant date: Jun 24, 2003
• Expiry date: Mar 2, 2020

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10T428/2998
• WIPO field: Pharmaceuticals
• WIPO sector: Chemistry

Abstract

A platelet-shaped cholesteric multilayer pigment which comprises the layer sequence A1/B/A2 whereA1 and A2 are identical or different and each comprise at least one cholesteric layer, andB is at least one interlayer which separates the layers A1 and A2 from one another and which absorbs all or some of the light transmitted by the layers A1 and A2,processes for its preparation, and its use are all described.