Bismuth vanadate pigments

US5536309A · kind A · utility

Assignee

• Basf Lacke & Farben Aktiengesellschaft · DE

Inventors

• Guenter Etzrodt · Stuttgart, DE
• Helmut Knittel · Ludwigsburg, DE
• Hansulrich Reisacher · Sachsenheim, DE

Key dates

• Filing date: Aug 24, 1994
• Grant date: Jul 16, 1996
• Expiry date: Aug 24, 2014

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C01P2006/66
• WIPO field: Basic materials chemistry
• WIPO sector: Chemistry

Abstract

Bismuth vanadate pigments have EQU Bi.sub.x E.sub.v Si.sub.y V.sub.(1-z) P.sub.z O.sub.w where x is from 0.8 to 1.2, y is from 0 to 4, z is from 0 to 0.2, v is from >0 to 0.5, and w is the number of oxygen atoms for satisfying the valence requirements of the cations, with the following provisos: PA1 a) when y=0, then z is from >0 to <0.05 and E is calcium or a mixture of calcium and zinc and/or magnesium in which the molar ratio of calcium to zinc and/or magnesium is .gtoreq.1, PA1 b) when 0<y<1, then z is from 0 to 0.2 and E is calcium or a mixture of calcium and zinc and/or magnesium in which the molar ratio of calcium to zinc and/or magnesium is .gtoreq.1, PA1 c) when y.gtoreq.1, then z is from 0 to 0.2 and E is zinc, magnesium, calcium,, lithium, aluminum or mixtures thereof.