Precipitated silicas which contain an active substance

US6214383A · kind A · utility

Assignee

• Degussa-Huels AG · DE

Inventors

• Heinz Esch · Wesseling, DE
• Robert Kuhlmann · Lechenich, DE
• Matthias Neumuller · Hasselroth, DE
• Karin Otto · Bonn, DE
• Ralf Rausch · Alzenau, DE
• Klaus Thomas

Key dates

• Filing date: Dec 10, 1998
• Grant date: Apr 10, 2001
• Expiry date: Dec 10, 2018

Classification

• Technology area (CPC A): Human Necessities
• CPC primary: A61P1/02
• WIPO field: Pharmaceuticals
• WIPO sector: Chemistry

Abstract

A precipitated silica which contains an active substance with a characteristic, delayed release of active substance is prepared by adding the active substance during preparation of the precipitated silica. The precipitated silica containing the active substance may be added to oral hygiene agents such as toothpastes, topical fluoride preparations, dental materials or medicinal chewing gums.