Mineral fibers decomposable in a physiological medium

USRE35557E · kind E · reissue

Assignee

• Isover Saint-Gobain · FR

Inventors

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

Key dates

• Filing date: May 1, 1995
• Grant date: Jul 8, 1997
• Expiry date: May 1, 2015

Classification

• Technology area (CPC —): General

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).