Method of manufacture of antiperspirant salts

Patent metadata

Field	Value
Publication number	US-9775791-B2
Application number	US-201414889863-A
Country	US
Kind code	B2
Filing date	May 9, 2014
Priority date	May 20, 2013
Publication date	Oct 3, 2017
Grant date	Oct 3, 2017

Abstract

A UHT process for the manufacture of an aqueous antiperspirant composition comprising the steps of: (i) mixing aluminium-containing antiperspirant salt, water soluble calcium salt, amino acid, and water, (ii) heating the mixture to a temperature of greater than 100° C. at a pressure of greater than 1 Bar (100,000 Pa) and (iii) restoring the mixture to ambient temperature and pressure.

First claim

The invention claimed is:

1. A process for the manufacture of an aqueous antiperspirant composition comprising the steps of:(i) mixing a basic aluminium chloride salt, water soluble calcium salt, amino acid, and water, (ii) heating the mixture to a temperature of greater than 110° C. at a pressure of 3 Bar (3,000,000 Pa) to 7 Bar (700,000 Pa) and (iii) restoring the mixture to ambient temperature and pressure, wherein the basic aluminium chloride salt is aluminium sesquichlorohydrate of the formula Al 2 OH 4.4 Cl 1.6 to Al 2 OH 4.9 Cl 1.1 , wherein the process is carried out using ultra-high temperature (UHT) processing equipment.

2. The process according to claim 1 , wherein the amino acid is glycine.

3. The process according to claim 1 , wherein the molar ratio of calcium to aluminium is from 1:20 to 1:2 and the molar ratio of amino acid to aluminium is from 1:10 to 1:1.

4. The process according to claim 2 , wherein the basic aluminium chloride salt, water soluble calcium snit, amino acid, and water pass from a feed vessel into a first heat exchanger for heating the mixture to elevated temperature greater than 110° C., then into an insulated holding tube for keeping the mixture at the elevated temperature, then optionally into a second heat exchanger for cooling the mixture, the mixture finally being released through a pressure release valve and the mixture being pumped between the aforementioned heat exchangers by an electric pump.

5. The process according to claim 4 , wherein the basic aluminium chloride salt, water soluble calcium salt, amino acid, and water are first pumped from the feed vessel into a homogeniser for thorough mixing prior to being pumped into the first heat exchanger.

6. The process according to claim 4 , wherein the resulting resulting antiperspirant composition passes directly or indirectly into a further mixing vessel and is mixed with fragrance and emulsifier.

7. The process according to claim 1 , wherein one or more additional components required for the formation of an antiperspirant roll-on composition is added to the mixture before the mixture is fully restored to ambient temperature.

8. The process according to claim 5 , wherein additional water is added to the mixture in order to reduce its temperature.

9. The process according to claim 5 , wherein fragrance and emulsifier are added to the mixture before the mixture is fully restored to ambient temperature.

10. The process according to claim 1 , comprising the addition of an emulsifier system comprising a first emulsifier having an HLB value in the range of from 2 to 6.5 and a second emulsifier having an HLB value in the range of from 12 to 18 to the mixture.

11. A method of gaining an antiperspirancy benefit comprising the topical application to the surface of the human body of a composition prepared according to claim 1 .

12. The process according to claim 1 wherein the basic aluminium chloride salt is employed at a concentration of from 1.4 to 5 mol.dm −3 .

13. The probe s according to claim 1 wherein the basic aluminium chloride salt is employed at a concentration of from 3 to 4.5 mol.dm −3 .

Assignees

• Conopco Inc

Inventors

• Fawzy Karim Mohamed Anwar M
• Franklin Kevin Ronald
• Waterfield Philip Christopher

Classifications

• A61K8/44

  Aminocarboxylic acids or derivatives thereof, e.g. aminocarboxylic acids containing sulfur; Salts; Esters or N-acylated derivatives thereof · CPC title

• A61K2800/40

  Chemical, physico-chemical or functional or structural properties of particular ingredients · CPC title

• A61K8/26 Primary

  Aluminium; Compounds thereof · CPC title

• A61Q15/00

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

• A61K8/19

  containing inorganic ingredients · CPC title