Colored cholesteric liquid-crystal polymers having optically variable properties

US6017984A · kind A · utility

Assignee

• Clariant Corporation · DE

Inventors

• Axel Schonfeld · Wiesbaden, DE
• Erwin Dietz · Kelkheim, DE
• Bernd Dewald · Idstein, DE

Key dates

• Filing date: Oct 16, 1997
• Grant date: Jan 25, 2000
• Expiry date: Oct 16, 2017

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C09K19/3809
• WIPO field: Basic materials chemistry
• WIPO sector: Chemistry

Abstract

The invention relates to colorant compositions consisting essentially of one or more cholesteric liquid-crystalline polymers and at least one colorant which absorbs light in the visible wavelength range. Suitable colorants are organic or inorganic pigments or dyes. Coatings comprising such colorant compositions feature color effects which are dependent on the viewing angle and which cannot be obtained by means of absorption pigments alone or by means of cLCP effect coatings.