Preservatives for perishable preparations, in particular for cosmetic and pharmaceutical preparations

US7628997B1 · kind B1 · utility

Assignee

• Schott AG · DE

Inventors

• Susanne Kessler · Ergolding, DE
• Sean Lee · Karlsruhe, DE

Key dates

• Filing date: Jul 7, 2000
• Grant date: Dec 8, 2009
• Expiry date: Sep 13, 2020

Classification

• Technology area (CPC A): Human Necessities
• CPC primary: A61K2800/524
• WIPO field: Pharmaceuticals
• WIPO sector: Chemistry

Abstract

The method of preserving a perishable cosmetic and/or pharmaceutical preparation includes adding bioactive glass particles to the preparation, preferably in amounts up to 10 percent by weight. The bioactive glass particles preferably have particle sizes (d50) less than or equal to 10 μm and contain from 40 to 60 wt. % SiO2, 10 to 30 wt. % CaO, 10 to 35 wt. % Na2O, 2 to 8 wt. % P2O5, 0 to 25 wt. % CaF2, 0 to 10 wt. % B2O3, 0 to 8 wt. % K2O and/or 0 to 5 wt. % MgO. A liquid cosmetic preparation with alcohol content insufficient for preservation is preserved in an inconspicuous manner by adding bioactive glass particles with particle sizes less than or equal to 10 μm and with a refractive index close enough to that of the liquid cosmetic preparation so that bioactive glass particles are substantially invisible to an observer.