Mineral fibers decomposable in a physiological medium

US5250488A · kind A · utility

Inventors

• Sylvie Thelohan · Paris, FR
• Alain De Meringo · Paris, FR
• Hans Furtak · Frankenthal (Pfalz), DE
• Wolfgang Holstein · Homberg (Efze), DE

Key dates

• Filing date: Nov 25, 1992
• Grant date: Oct 5, 1993
• Expiry date: Nov 25, 2012

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C03C2213/02
• WIPO field: Materials, metallurgy
• WIPO sector: Chemistry

Abstract

The present invention relates to mineral fiber compositions useful for forming fibers which are readily degraded in a physiological medium such as that found within the human body. Advantageous compositions formed according to the present invention comprise the following components in the proportions by weight set forth below: ______________________________________ SiO.sub.2 37 to 58 wt. %; Al.sub.2 O.sub.3 4 to 14 wt. %; CaO 7 to 40 wt. %; MgO 4 to 16 wt. %; P.sub.2 O.sub.5 1 to 10 wt. %; Fe.sub.2 O.sub.3 up to about to 15 wt. %; ______________________________________ wherein the amount of CaO+MgO+Fe.sub.2 O.sub.3 is greater than 25% and the total amount of Na.sub.2 O+K.sub.2 O is less than 7%. The total iron contained within the composition is expressed in the form of ferric oxide (Fe.sub.2 O.sub.3).