Production of zinc and alkaline earth metal titanates

US4173485A · kind A · utility

Assignee

• BAYER HEALTHCARE LLC · DE

Inventors

• Peter Woditsch · Krefeld, DE
• Gerhard Winter · Dossenheim, DE
• Gunter Linde · Krefeld, DE
• Friedhelm Muller · Odenthal, DE

Key dates

• Filing date: Jan 31, 1978
• Grant date: Nov 6, 1979
• Expiry date: Jan 31, 1998

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C01P2006/60
• WIPO field: Materials, metallurgy
• WIPO sector: Chemistry

Abstract

Titanates of zinc and/or alkaline earth metals are produced by simultaneously adding to a suspension of finely divided TiO.sub.2, maintained at a substantially constant pH above about 8, a solution of a salt of zinc and/or alkaline earth metal and alkali to form a hydroxide precipitate. Filtration produces a filter cake mixture of TiO.sub.2 and hydroxide and calcination at above 500.degree. C. produces the desired titanate of narrow particle size distribution and desirable optical properties. Non-simultaneous addition results in a non-filterable material. Zinc, magnesium and/or calcium are preferred and doping elements such as aluminum, phosphorus, boron and/or silicon may also be present.