Process for the preparation of hydroxyapatite

US5405436A · kind A · utility

Assignee

• BK Ladenburg GmbH Gesellschaft fur Chemische Erzeugnisses · DE

Inventors

• Alexander Maurer · Hürth, DE
• Gudrun Raab · Hemsbach, DE
• Guenter Raab · Hemsbach, DE
• Reinhold Schmitt · Weinheim, DE
• Detlev Schober · Bischofswerda, DE
• Richard Taenzler · Hemsbach, DE

Key dates

• Filing date: Sep 27, 1993
• Grant date: Apr 11, 1995
• Expiry date: Sep 27, 2013

Classification

• Technology area (CPC D): Textiles; Paper
• CPC primary: D06P3/523
• WIPO field: Pharmaceuticals
• WIPO sector: Chemistry

Abstract

A process for the preparation of a hydroxyapatite, which is suitable as a tooth-cleaning substance, by precipitation from aqueous phosphoric acid and calcium hydroxide solution, in which a calcium-doped phosphoric acid solution is fed to an intensive mixer with a suspension of calcium hydroxide/oxide in a molar ratio of Ca:P=1.667 corresponding to the hydroxyapatite of and reacted there at precipitation temperatures of 60.degree.-100.degree. C., preferably 80.degree.-90.degree. C. and a pH of 4-8, preferably of 6.5-7.5. Also disclosed in a tooth-cleaning substance containing the hydroxyapatite.