US 5,250,488 A · Mineral fibers decomposable in a physiological medium

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).

Claims7

Dependent claims

A mineral fiber composition decomposable in a physiological medium, said composition consisting essentially of:

______________________________________ 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 0.1 to 15 wt. %;
Na.sub.2 O + K.sub.2 O up to about 7 wt. %;
and Impurities up to about 3 wt. %, ______________________________________
wherein the amount of CaO+MgO+Fe.sub.2 O.sub.3 is greater than 25 wt % of said composition.

6 more elements

Dependencies are inferred from the claim text.

Mineral fibers decomposable in a physiological medium

Life of this patent

Mineral fibers decomposable in a physiological medium

Life of this patent

Abstract

Claims7