Preparation of bluish luster pigments

US5624487A · kind A · utility

Assignee

• BASF SE

Inventors

• Helmut Schmidt · Riegelsberg, DE
• Werner Ostertag · Havelsee, DE
• Hermann Bidlingmaier · Offenburg, DE
• Norbert Mronga · Dossenheim, DE
• Juan Antonio Gonzalez Gomez · Ludwigshafen, DE
• Claus Kaliba · Schifferstadt, DE
• Raimund Schmid · Neustadt, DE
• Raymond Ellinghoven · Erbach, DE

Key dates

• Filing date: Mar 26, 1996
• Grant date: Apr 29, 1997
• Expiry date: Mar 26, 2016

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10T428/2996
• WIPO field: Pharmaceuticals
• WIPO sector: Chemistry

Abstract

Preparation of bluish luster pigments by treating titania-coated silicatic platelets with a reducing gas mixture, which comprises treating titania-coated silicatic platelets whose titania coating has a geometric layer thickness of from 10 to 60 nm at from 800.degree. to 900.degree. C. with a gas mixture comprising a vaporized organic compound and ammonia, and also bluish luster pigments based on silicatic platelets comprising a reduced titania coating with a geometric layer thickness of from 10 to 60 nm and CIELAB color coordinates -2.ltoreq.a*.ltoreq.2 and b*.ltoreq.-20 (measuring angle 20.degree., standard illuminant D65).