Anhydrous antiperspirant aerosol compositions

Patent metadata

Field	Value
Publication number	US-10117814-B2
Application number	US-201515520615-A
Country	US
Kind code	B2
Filing date	Oct 22, 2015
Priority date	Oct 27, 2014
Publication date	Nov 6, 2018
Grant date	Nov 6, 2018

Abstract

An anhydrous antiperspirant aerosol composition comprising a particulate antiperspirant active system, suspending agent, carrier oil, and liquefied propellant gas, characterized in that the particulate antiperspirant active system comprises an aluminum sesquichlorohydrate of formula Al2(OH)4.4Cl1.6 to Al2(OH)4.9Cl1.1 activated with a water soluble calcium salt.

First claim

The invention claimed is:

1. An anhydrous antiperspirant aerosol composition comprising a particulate antiperspirant active system, suspending agent, carrier oil, and liquefied propellant gas, wherein particulate antiperspirant active system comprises an aluminium sesquichlorohydrate of formula Al 2 (OH) 4.4 Cl 1.6 to Al 2 (OH) 4.9 Cl 1.1 activated with a water soluble calcium salt and an amino acid, and wherein the molar ratio of amino acid to aluminium is from 1:5 to 1:1, and the amino acid is glycine.

2. The composition according to claim 1 , wherein the aluminium sesquichlorohydrate the particulate antiperspirant active system has a Band III content of at least 40%.

3. The composition according to claim 2 , wherein the aluminium sesquichlorohydrate in the particulate antiperspirant active system has a Band III content of at least 60%.

4. The composition according to claim 2 , wherein the aluminium sesquichlorohydrate in the particulate antiperspirant active system has a Band III to Band II ratio of 2:1 or greater.

5. The composition according to claim 4 , wherein the aluminium sesquichlorohydrate in the particulate antiperspirant active system has a Band III to Band II ratio of 5:1 or greater.

6. The composition according to claim 1 , wherein the aluminium sesquichlorohydrate in the particulate antiperspirant active system has a molar ratio of calcium to aluminium of at least 1:20.

7. The composition according to claim 6 , wherein the aluminium sesquichlorohydrate in the particulate antiperspirant active system has a molar ratio of calcium to aluminium of at least 1:15 and the molar ratio of amino acid to aluminium is from 1:4 to 1:1.

8. A method of manufacture of an antiperspirant composition according to claim 1 , wherein an aqueous solution of aluminium sesquichlorohydrate of formula Al 2 (OH) 4.4 Cl 1.6 to Al 2 (OH) 4.9 Cl 1.1 is heated with a water soluble calcium salt and amino acid to achieve a Band III content of at least 40% before being spray dried to give a powder which is subsequently formulated with a suspending agent, carrier oil and liquefied propellant gas.

9. The method according to claim 8 , wherein the solution of aluminium sesquichlorohydrate of formula Al 2 (OH) 4.4 Cl 1.6 to Al 2 (OH) 4.9 Cl 1.1 is heated with a water soluble calcium salt and an amino acid- to achieve a Band III content of at least 55% before it is spray dried.

10. The method according to claim 8 , wherein the powder is of a mean (D50) particle size that is from 20 to 30 microns before being formulated with the suspending agent, carrier oil and liquefied propellant gas.

11. The method according to claim 8 , wherein the water soluble calcium salt is calcium chloride.

12. The method according to claim 8 , wherein the aluminium sesquichlorohydrate of formula Al 2 (OH) 4.7 Cl 1.3 to Al 2 (OH) 4.9 Cl 1.1 .

Assignees

• Conopco Inc

Inventors

• Court Duncan Alexander
• Franklin Kevin Ronald
• Waterfield Philip Christopher

Classifications

• A61K8/046 Primary

  Aerosols; Foams · CPC title

• A61K8/416

  Quaternary ammonium compounds (A61K8/35 takes precedence) · CPC title

• A61K8/20

  Halogens; Compounds thereof · CPC title

• A61Q15/00

  Anti-perspirants or body deodorants (deodorisation of air A61L9/00) · CPC title

• A61K8/891

  saturated, e.g. dimethicone, phenyl trimethicone, C24-C28 methicone or stearyl dimethicone · CPC title