Stabilisation of aqueous mineral preparations by reuterin
The present invention relates to a process for stabilizing aqueous preparations of minerals by adding reuterin to the aqueous preparations, to the use of reuterin for the stabilization of such aqueous mineral preparations, and the aqueous mineral preparations containing reuterin.
1. A process for treating an aqueous mineral preparation comprising contacting the preparation with a biocidal effective amount of reuterin, wherein the mineral preparation comprises a filler, a pigment, calcium carbonate, chalk, limestone, calcite, marble, dolomite, calcium sulfate, quartz, attapulgite, a clay, kaolin, kaolinitic clay, calcined kaolinitic clay, montmorillonite, mica, talc, diatomaceous earth, finely divided silica, aluminium oxide, aluminium hydroxide, a silicate, aluminium silicate, iron oxide, titanium dioxide, pumice, or sepiolite, or any mixture thereof.
2. The process according to claim 1 , wherein the mineral preparation is ground natural calcium carbonate comprising chalk, limestone, calcite, marble, or dolomite or any mixture thereof.
3. The process according to claim 1 , wherein the mineral preparation is precipitated calcium carbonate.
4. The process according to claim 1 , wherein the mineral preparation is a calcium carbonate dispersion comprising precipitated calcium carbonate, wherein reuterin is added before, during and/or after precipitation of the calcium carbonate.
5. The process according to claim 1 , wherein the mineral preparation is a calcium carbonate dispersion comprising natural calcium carbonate, wherein the reuterin is added before, during and/or after grinding of the calcium carbonate.
6. The process according to claim 1 , wherein the mineral preparation comprises calcium carbonate, kaolin, dolomite, kaolinitic clay, or caolinitic clay, or any mixture thereof.
7. The process according claim 1 , wherein the mineral preparation comprises a composite material comprising one or more of a filler, a pigment, calcium carbonate, chalk, limestone, calcite, marble, dolomite, calcium sulfate, quartz, attapulgite, a clay, kaolin, kaolinitic clay, calcined kaolinitic clay, montmorillonite, mica, talc, diatomaceous earth, finely divided silica, aluminium oxide, aluminium hydroxide, a silicate, aluminium silicate, iron oxide, titanium dioxide, pumice, or sepiolite.
8. The process according to claim 1 , wherein the mineral preparation comprises a mineral composite comprising precipitated calcium carbonate, mica and titanium dioxide.
9. The process according to claim 1 , wherein the mineral preparation comprises a mineral treated with a fatty acid.
10. The process according to claim 1 , wherein the mineral preparation comprises calcium carbonate surface-reacted with a medium-strong to strong acid.
11. The process according to claim 1 , wherein the mineral preparation has a solids content from 40 to 85 wt.-%, of the total weight of the preparation.
12. The preparation according to claim 1 , wherein the mineral preparation has a solids content from 45 to 82 wt.-%, of the total weight of the preparation.
13. The process according to claim 1 , wherein the mineral preparation has a water content of from 15 to 60 wt.-%, of the total weight of the preparation.
14. The process according to claim 1 , wherein the mineral preparation has a pH in the range of from above 7 to 10.5, as measured at 25° C.
15. The process according to claim 1 , wherein the reuterin is obtained from reaction of glycerol with Lactobacillus reuteri.
16. The process according to claim 1 , wherein the reuterin comprises monomeric 3-hydroxypropionaldehyde, hydrated monomeric 3-hydroxypropionaldehyde, or dimeric 3-hydroxypropionaldehyde, or cyclic forms thereof, or any mixtures thereof.
17. The process according to claim 1 , wherein the reuterin is added to the mineral preparation in an amount based on weight of water of from 100 to 5000 ppm.
18. The process according to claim 1 , wherein the reuterin is added to the mineral preparation at a temperature of from 10 to 90° C.
19. An aqueous mineral preparation comprising a mineral and a biocidal effective amount of reuterin, wherein the mineral preparation comprises a filler, a pigment, calcium carbonate, chalk, limestone, calcite, marble, dolomite, calcium sulfate, quartz, attapulgite, a clay, kaolin, kaolinitic clay, calcined kaolinitic clay, montmorillonite, mica, talc, diatomaceous earth, finely divided silica, aluminium oxide, aluminium hydroxide, a silicate, aluminium silicate, iron oxide, titanium dioxide, pumice, or sepiolite, or any mixture thereof.
20. The mineral preparation according to claim 19 , wherein the mineral preparation is ground natural calcium carbonate comprising chalk, limestone, calcite, marble, or dolomite or any mixture thereof.
21. The mineral preparation according to claim 19 , wherein the mineral preparation is precipitated calcium carbonate.
22. The mineral preparation according to claim 19 , wherein the mineral preparation comprises calcium carbonate, kaolin, dolomite, kaolinitic clay, or caolinitic clay, or any mixture thereof.