Color-stable, antimicrobial, porous glass powder and process for producing such a powder at high temperatures and use thereof

Abstract

A color-stable, antimicrobial glass powder obtained by partial ion exchange at a temperature of 300° C. to 350° C. and an exchange time of 1 to 120 minutes, is formed of a mixture of porous glass particles having micropores and macropores made of borosilicate glass continuously foamed by extrusion having a Fe2O3 content <0.2 wt %, in which the obtained glass foam is subsequently comminuted by dry grinding to average particle sizes of 1.0 to 8.0 μm. The mixture includes color stabilizers containing 0.1% to 0.2% of ammonium ions and antimicrobial metal ions from dissolved metal salts, wherein the metal ions may be silver and/or zinc and/or copper ions. A method for the production of a color-stable, antimicrobial glass powder and applications for using the color-stable, antimicrobial glass powder are also provided.

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