Multilayer cholesteric pigments

US6531221B1 · kind B1 · utility

Assignee

• BASF SE

Inventors

• Peter Schuhmacher · Mannheim, DE
• Norbert Schneider · Schorndorf, DE
• Raimund Schmid · Neustadt, DE
• Wolfgang Best · Freinsheim, DE
• Peter Blaschka · Ludwigshafen, DE
• Frank Meyer · Mannheim, DE

Key dates

• Filing date: Nov 6, 2000
• Grant date: Mar 11, 2003
• Expiry date: Nov 6, 2020

Classification

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

Abstract

A platelet-shaped cholesteric multilayer pigment which comprises the layer sequence A/B/ and if desired C,whereA and C independently of one another are at least one partly light-permeable absorption layer, andB is at least one cholesteric layer.