Goniochromatic luster pigments based on multiply coated iron oxide platelets

US6193794A · kind A · utility

Assignee

• BASF SE

Inventors

• Raimund Schmid · Neustadt, DE
• Oliver Seeger · Mannheim, DE
• Norbert Mronga · Dossenheim, DE

Key dates

• Filing date: Mar 2, 1999
• Grant date: Feb 27, 2001
• Expiry date: Mar 2, 2019

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10T428/2993
• WIPO field: Basic materials chemistry
• WIPO sector: Chemistry

Abstract

The iron oxide platelets comprise at least one layer packet comprising PA1 A) a colorless coating having a refractive index n.ltoreq.1.8, and PA1 B) a colorless coating having a refractive index n.gtoreq.2.0.