Method of manufacture of antiperspirant salts

Patent metadata

Field	Value
Publication number	US-2016106644-A1
Application number	US-201414889863-A
Country	US
Kind code	A1
Filing date	May 9, 2014
Priority date	May 20, 2013
Publication date	Apr 21, 2016
Grant date	—

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

1 . A 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.

2 . A process according to claim 1 , wherein the mixture is heated to a temperature of greater than 110° C. at a pressure of greater than 2 Bar (200,000 Pa).

3 . A process according to claim 1 , wherein the basic aluminium chloride salt is of formula Al 2 OH 4.4 Cl 1.6 to Al 2 OH 5 Cl.

4 . A process according to claim 3 , wherein the basic aluminium chloride salt is aluminium sesquichlorohydrate of formula Al 2 OH 4.4 Cl 1.6 to Al 2 OH 4.9 Cl 1.1 .

5 . A process according to claim 1 , wherein the amino acid is glycine.

6 . A process according to claim 1 , wherein the molar ratio of calcium to aluminium is at least 1:20 and the molar ratio of amino acid to aluminium is at least 1:10.

7 . A process according to claim 1 , carried out using ultra-high temperature (UHT) processing equipment.

8 . A process according to claim 5 , wherein the basic aluminium chloride salt, water soluble calcium salt, amino acid, and water pass from a feed vessel into a heat exchanger for heating the mixture to the required temperature, then into an insulated holding tube for keeping the mixture at the required temperature for the desired time, then optionally into a heat exchanger for cooling the mixture, the mixture finally being released through a pressure release valve and the mixture being pumped between the aforementioned locations by an electric pump.

9 . A process according to claim 6 , 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 heat exchanger used to heat the mixture.

10 . A process according to claim 6 , wherein the resulting antiperspirant composition passes directly or indirectly into a further mixing vessel and is mixed with further components to give an antiperspirant composition suitable for retail.

11 . A process according to claim 1 , wherein the mixture is further processed with additional components required for the formation of an antiperspirant roll-on composition before the mixture is fully restored to ambient temperature.

12 . A process according to claim 9 , wherein the mixture is further processed with additional water in order to reduce its temperature.

13 . A process according to claim 9 , wherein the mixture is further processed with fragrance and emulsifier before the mixture is fully restored to ambient temperature.

14 . A 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.

15 . 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 .

Assignees

• Conopco Inc Dba Unilever

Inventors

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

Classifications

• A61K8/26 Primary

  Aluminium; Compounds thereof · CPC title

• A61Q15/00

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

• A61K8/44

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

• A61K8/19

  containing inorganic ingredients · CPC title

• A61K2800/40

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