Micronized alkaline earth metal carbonate

US6479029B1 · kind B1 · utility

Assignee

• Solvay Barium Strontium GmbH · DE

Inventors

• Norbert Mingels · Dinslaken, DE
• Karl Koehler · Bad Salzdetfurth, DE
• Jai-Won Park · Oettingen, DE
• Hans Gabel · Linz, DE

Key dates

• Filing date: Jun 3, 1998
• Grant date: Nov 12, 2002
• Expiry date: Jun 3, 2018

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C01P2006/12
• WIPO field: Materials, metallurgy
• WIPO sector: Chemistry

Abstract

The invention concerns a micronized alkaline earth metal carbonate prepared with or without the use of an agent preventing crystal growth, and a process for its preparation and use. The prepared micronized calcium carbonate, barium carbonate with a BET surface area ranging from 3 to 30 m2/g or strontium carbonate with a BET surface area ranging from 3 to 50 m2/g is suitable in particular for preparing capacitors, thermistors and other oxide ceramic electrical components containing calcium oxide, barium oxide or strontium oxide, and high-temperature superconductors. Ammonium salts or alkylammonium salts of carboxylic acids having a total of between 3 and 12 carbon atoms and at least two COOH groups or at least two OH groups, e.g. salts of maleic acid or nitric acid, are used as agents preventing crystal growth.