Pigment flakes

US6291065A · kind A · utility

Assignee

• Merck Patent GmbH · DE

Inventors

• Eike Poetsch · Mühltal, DE
• Gerhard Pfaff · Mainburg, DE
• Matthias Kuntz · Seeheim-Jugenheim, DE
• Stephan Derow · Griesheim, DE
• David Coates · Bishop's Stortford, GB

Key dates

• Filing date: Sep 21, 1999
• Grant date: Sep 18, 2001
• Expiry date: Sep 21, 2019

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10T428/31504
• WIPO field: Basic materials chemistry
• WIPO sector: Chemistry

Abstract

Described are pigment flakes having a chiral liquid crystalline polymer material, the polymer material serving as a carrier material or being coated onto a carrier material. The pigment flakes have at least one dye that is chemically bound to the polymer. Also described are methods of making such pigment flakes and using them in paints, printing inks, spray paints, cosmetic products, colored plastics, optical elements and security applications.