Water-insoluble, antimicrobial silicate glass and use thereof
View Patent ↗The invention relates to an antimicrobial silicate glass with the following weight composition in wt. % based on oxides: SiO 2 20 to 70, Na 2 O 5 to 30, K 2 O 0 to 5, P 2 O 5 1 to 15, B 2 O 3 0 to 10, CaO 4 to 30, AgO 0 to 2, ZnO 0 to 8, CuO 0 to 5, MgO 0 to 8, Al 2 O 3 0 to 7, CeO 2 0 to 5, Fe 2 O 3 0 to 2 whereby the sum of the components AgO, CuO, CeO 2 is >10 ppm, preferably ≧100 ppm and <8 wt. %.
1. Water-insoluble, antimicrobial silicate glass powder, whereby the glass composition comprises the following components in wt. % based on oxides:
SiO 2 32to 48
Na 2 O 23 to 32
P 2 O 2 5to 7
CaO 23 to 32
AgO 0.01 to 2
whereby the ratio of Ca/P lies in the range 2.0 to 6.0, and the size of the particles of the glass powder is <100 μm; and
wherein the maximum concentrations of heavy metals are:
Pb<20 ppm, Cd<5 ppm, As<5 ppm, Sb<10 ppm, Hg<1 ppm, and Ni<10 ppm.
2. Water-insoluble, antimicrobial silicate glass powder in accordance with claim 1 , characterized in that the composition in wt. % based on oxides further comprises:
K 2 O 0 To 5
ZnO 0 to 8
CuO 0 to 5
MgO 0 to 5
Al 2 O 3 0 to 7
CeO 2 0 to 5
Fe 2 O 3 0 to 2
whereby the sum of the components AgO, CuO, CeO 2 is >10 ppm and <8 wt. %.
3. Water-insoluble, antimicrobial silicate glass powder in accordance with claim 1 , characterized in that the antimicrobial silicate glass contains ZnO in the range of 5 to 8 wt. % based on oxides.
4. Water-insoluble antimicrobial silicate glass powder including an antimicrobial silicate glass in accordance with claim 1 , characterized in that the size of the particles of the glass powder is <5 μm.
5. Water-insoluble, antimicrobial silicate glass powder in accordance with claim 4 , characterized in that particles with a size <5 μm can be obtained through attritor grinding of the glass in water.
6. Process for the production of an antimicrobial glass powder in accordance with claim 1 comprising the following steps:
a glass is melted from raw materials;
the melted glass is processed into ribbons;
the ribbons are ground into glass powder, whereby the size of the particles <100 μm.
7. Water-insoluble, antimicrobial silicate glass powder in accordance with claim 1 , wherein the size of the particles of the glass powder is <50 μm.
8. Water-insoluble, antimicrobial silicate glass powder in accordance with claim 1 , wherein the size of the particles of the glass powder is <20 μm.
9. Water-insoluble, antimicrobial silicate glass powder in accordance with claim 1 , wherein the size of the particles of the glass powder is <2 μm.
10. Water-insoluble, antimicrobial silicate glass powder in accordance with claim 1 , wherein the sum of the components AgO, CuO, CeO 2 is >100 ppm.
11. The process of claim 6 , wherein the size of the particles is <50 μm.
12. The process of claim 6 , wherein the size of the particles is <20 μm.
13. A cosmetic product including the water-insoluble, antimicrobial silicate glass powder of claim 1 .
14. A deodorant product including the water-insoluble, antimicrobial silicate glass powder of claim 1 .
15. A food product including the water-insoluble, antimicrobial silicate glass powder of claim 1 .
16. A paint including the water-insoluble, antimicrobial silicate glass powder of claim 1 .
17. A plaster including the water-insoluble, antimicrobial silicate glass powder of claim 1 .
18. A paper-hygiene product including the water-insoluble, antimicrobial silicate glass powder of claim 1 .
19. A medical product including the water-insoluble, antimicrobial silicate glass powder of claim 1 .
20. A cleaner including the water-insoluble, antimicrobial silicate glass powder of claim 1 .
21. A lacquer including the water-insoluble, antimicrobial silicate glass powder of claim 1 .