Method of making high performance activated aluminum sesquichlorohydrate powders
Activated aluminum sesquichlorohydrate (AASCH) powders prepared by (a) diluting the concentrated aluminum sesquichlorohydrate (ASCH) solution to from about 10% to about 25% by weight, (b) heating the diluted solution to obtain a Band III polymer concentration of at least about 20% and a Band IV polymer concentration of at least about 15%, (c) drying the heated solution to powders, and (d) optionally screen or light mill the powders to free flowing spherical particles are disclosed.
1. Aluminum sesquichlorohydrate (AASCH) powders prepared by:
(a) diluting a concentrated aluminum sesquichlorohydrate (ASCH) solution to about 1% to about 25% by weight,
(b) heating the diluted solution to activate the solution, and
(c) drying the activated solution to form the activated aluminum sesquichlorohydrate (AASCH) powders,
wherein the activated AASCH powders have an Al:Cl ratio of from about 1.60 to about 1.90, and
wherein the activated AASCH powders have a Band III polymer concentration of at least 20% and a Band IV polymer concentration of at least 15%, and wherein no acid or acidic aluminum chloride is introduced after the heating of the diluted solution.
2. Aluminum sesquichlorohydrate (AASCH) powders of claim 1 , wherein the Band III polymer concentration is at least 40% and the Band IV polymer concentration is at least 20%.
3. Aluminum sesquichlorohydrate (AASCH) powders claim 1 , further comprising adding a buffering agent prior to the drying to form the powder.
4. Aluminum sesquichlorohydrate (AASCH) powders of claim 3 , wherein the buffering agent is selected from the group consisting of amino acid, alkaline glycinate, alkaline earth glycinate, zinc glycinate, strontium glycinate, and mixtures thereof.
5. Aluminum sesquichlorohydrate (AASCH) powders of claim 3 , wherein the buffering agent is selected from the group consisting of glycine, betaine, urea and mixtures thereof.
6. Aluminum sesquichlorohydrate (AASCH) powders of claim 1 , wherein the diluted solution is heated to about 85° C. to about 105° C. for at least 30 minutes.
7. Aluminum sesquichlorohydrate (AASCH) powders of claim 1 , wherein the diluting of the concentrated sesquichlorohydrate (ASCH) solution includes adding a solvent.
8. Aluminum sesquichlorohydrate (AASCH) powders of claim 1 , wherein the concentrated ASCH solution has a Band I polymer concentration of less than 5% and Band III polymer concentration of at least 20%.
9. Aluminum sesquichlorohydrate (AASCH) powders of claim 1 , wherein the concentrated ASCH solution has an Al:Cl ratio ranging from about 1.5 to about 1.9.
10. Aluminum sesquichlorohydrate (AASCH) powders of claim 1 , further comprising sieving or milling the AASCH powders.
11. Aluminum sesquichlorohydrate (AASCH) powders of claim 10 , wherein the sieved or milled AASCH powders have a particle size ranging from about 1 micron to about 200 microns.
12. Aluminum sesquichlorohydrate (AASCH) powders of claim 1 , wherein Band I polymer concentration is less than 1%.
13. Aluminum sesquichlorohydrate (AASCH) powders of claim 1 , wherein the AASCH powders are substantially free of zirconium.
14. Aluminum sesquichlorohydrate (AASCH) powders of claim 1 , wherein the drying is spray drying.
15. Aluminum sesquichlorohydrate (AASCH) powders of claim 1 , wherein the AASCH powders have at least 5% of Al 30 .
16. Aluminum sesquichlorohydrate (AASCH) powders of claim 1 , wherein the AASCH powders have less than 10% of Al 13 .
17. Aluminum sesquichlorohydrate (AASCH) powders of claim 1 , wherein the AASCH powders have a moisture content ratio ranging from about 2% to about 15%.
18. Aluminum sesquichlorohydrate (AASCH) powders of claim 1 , wherein the AASCH powders have a pH ranging from about 3.0 to about 4.5.
19. An antiperspirant formulation comprising the aluminum sesquichlorohydrate (AASCH) powders of claim 1 .