Anhydrous antiperspirant compositions

Patent metadata

Field	Value
Publication number	US-10729627-B2
Application number	US-201916512040-A
Country	US
Kind code	B2
Filing date	Jul 15, 2019
Priority date	Oct 27, 2014
Publication date	Aug 4, 2020
Grant date	Aug 4, 2020

Abstract

Anhydrous antiperspirant stick or soft solid composition comprising an antiperspirant active system, thickening agent, and non-aqueous carrier oil, characterised in that the particulate antiperspirant active system comprises an aluminium sesequichlorohydrate 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.

First claim

The invention claimed is:

1. An anhydrous antiperspirant stick or soft solid composition comprising an antiperspirant active system, thickening agent, and non-aqueous carrier oil, characterised in that the particulate antiperspirant active system is composed of a water soluble calcium salt, an amino acid and an aluminium sesquichlorohydrate of formula Al 2 (OH) 4.7 Cl 1.3 to Al 2 (OH) 4.9 Cl 1.1 heat activated with a water soluble calcium salt and an amino acid, wherein the aluminium sesquichlorohydrate in the antiperspirant active system has a molar ratio of calcium to aluminium of at least 1:20 and a molar ratio of amino acid to aluminium of at least 1:10 and wherein the particulate antiperspirant active system has a mean particle size (D50) of from 2 to 30 microns,
wherein the antiperspirant active system is present in a concentration of 10% to 25%, by weight of the composition, and
wherein the amino acid is glycine.

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

3. The composition according to claim 1 , wherein the aluminium sesquichlorohydrate in the 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 of at least 1:4.

4. The composition according to claim 1 , wherein the water soluble calcium salt is calcium chloride.

5. The composition according to claim 1 , 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 particulate antiperspirant active system has a mean particle size (D50) of from 2 to 10 microns.

7. The composition according to claim 1 wherein the composition is in the form of an anhydrous antiperspirant stick.

8. A method of manufacture of an antiperspirant composition according to claim 1 , wherein a solution of aluminium sesquichlorohydrate of formula Al 2 (OH) 4.7 Cl 1.3 to Al 2 (OH) 4.9 Cl 1.1 is heated with a water soluble calcium salt to achieve a Band III content of at least 40% before being spray dried to give a powder which is subsequently formulated with thickening agent and non-aqueous carrier oil to give a composition having a penetration force value of at least 500 gram-force, wherein both calcium and amino acid are present and 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.

9. The method according to claim 8 , wherein the solution of aluminium sesquichlorohydrate of formula Al 2 (OH) 4.7 Cl 1.3 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 60% before it is spray dried.

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

Assignees

• Conopco Inc

Inventors

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

Classifications

• C01F7/57

  Basic aluminium chlorides, e.g. polyaluminium chlorides · CPC title

• A61K2800/31

  Anhydrous · CPC title

• A61K8/922

  of vegetable origin · CPC title

• C01P2004/61

  Micrometer sized, i.e. from 1-100 micrometer · CPC title

• C01P2006/90

  Other properties not specified above · CPC title