Titanium dioxide, a process and its production

US5061473A · kind A · utility

Assignee

• BAYER HEALTHCARE LLC · DE

Inventors

• René de Cleyn · Brasschaat, BE
• Peter Thometzek · Bensberg, DE
• Jakob Rademachers · Krefeld, DE

Key dates

• Filing date: Jun 13, 1990
• Grant date: Oct 29, 1991
• Expiry date: Jun 13, 2010

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C01P2006/80
• WIPO field: Materials, metallurgy
• WIPO sector: Chemistry

Abstract

A titanium dioxide composition useful as the opacifier agent for vitreous enamels and fusion enamels comprises TiO.sub.2 predominantly in the form of isometric primary particles from 0.5 to 5.0 .mu.m in size, which are aggregated to predominantly spherolithic particles 1 to 100 .mu.m in diameter, with a BET surface of 1 to 4.5 m.sup.2 /g and an apparent density of 0.2 to 1.3 kg/1, is prepared by subjecting titanium dioxide hydrate having a BET surface of from 50 to 500 m.sup.2 /g to accelerated calcination at temperatures of 800.degree. to 1600.degree. C.