Process to manufacture antiperspirant compositions

Patent metadata

Field	Value
Publication number	US-2016199278-A1
Application number	US-201414912957-A
Country	US
Kind code	A1
Filing date	Aug 18, 2014
Priority date	Sep 2, 2013
Publication date	Jul 14, 2016
Grant date	—

Abstract

The invention relates to a process of manufacture of a solid cosmetic antiperspirant in the form of a stick comprising from 0.0005 to 3 wt. % of a hydroxyalkyl urea, the process comprising the steps of comprising: (a) providing a stick dispenser comprising a stick barrel; (b) providing a first mixture comprising a solvent and gellant and heating the mixture to a temperature above the melting point of the gellant; (c) providing a second mixture comprising a hydroxyalkyl urea and a carrier material selected from the group consisting of: a natural oil that comprises a triglyceride of an unsaturated carboxylic acid, and polyalkylene glycols having a molecular weight of up to 650 Daltons, and heating this mixture to a temperature of 65° C. or above; (d) mixing together of the first and second mixtures; (e) addition of an antiperspirant active to the mixture (d); and, (f) filling a stick barrel with a portion of the mixture (e).

First claim

1 . A process of manufacture of a solid cosmetic antiperspirant composition in the form of a stick comprising from 0.0005 to 3 wt. % of a hydroxyalkyl urea, the process comprising the steps of: —
(a) providing a stick dispenser comprising a stick barrel;
(b) providing a first mixture comprising a solvent and gellant and heating the mixture to a temperature above the melting point of the gellant;
(c) providing a second mixture comprising a hydroxyalkyl urea and a carrier material selected from the group consisting of: a natural oil that comprises a triglyceride of an unsaturated carboxylic acid, and polyalkylene glycols having a molecular weight of up to 650 Daltons, and heating this mixture to a temperature of 65° C. or above;
(d) mixing together of the first and second mixtures;
(e) addition of an antiperspirant active to the mixture (d); and,
(f) filling a stick barrel with the mixture (e).

2 . A process according to claim 1 , wherein the first mixture is heated to a temperature of from 65° C. to 120° C., preferably 70° C. to 100° C., more preferably 80° C. to 95° C.

3 . A process according to claim 1 , wherein for step d), each of the two mixtures is at a temperature of 60° C. to 100° C., preferably 65° C. to 90° C., more preferably 75° C. to 85° C.

4 . A process according to claim 1 wherein the hydroxyalkyl urea has a formula:

wherein R 1 , R 2 , R 3 and R 4 each independently represent: Hydrogen, a C 1-4 alkyl, or a C 2-6 hydroxyalkyl group, with the proviso that at least one of the groups R 1 , R 2 , R 3 and R 4 is a C 2-6 hydroxyalkyl group.

5 . A process according to claim 4 , wherein the hydroxyalkyl urea is a hydroxyethyl urea of structure:

6 . A process according to claim 1 , wherein the natural oil comprises a triglyceride of an unsaturated carboxylic acid containing 1, 2, or 3 olefinic bonds.

7 . A process according to claim 6 , wherein the natural oil comprises a triglyceride of an unsaturated carboxylic acid containing from 14 to 22 carbon atoms, preferably 16-20 carbon atoms, more preferably 18 carbon atoms.

8 . A process according to claim 1 , wherein the natural oil comprises sunflower seed oil.

9 . A process according to claim 1 , wherein the polyalkylene glycol carrier material is selected from the group consisting of: polybutylene glycol, polypropylene glycol, polyethylene glycol and mixtures thereof.

10 . A process according to claim 1 , wherein the carrier material is selected from: sunflower seed oil, polyethylene glycol having a molecular weight of from 360 to 460 Daltons and mixtures thereof.

11 . A process according to claim 1 , wherein the resultant solid cosmetic antiperspirant composition comprises no more than 1 wt. % of water, preferably the stick composition is anhydrous.

12 . A process according to claim 1 , wherein the hydroxyalkyl urea is included at a level of from 0.0005 to 2.5 wt. %, more preferably from 0.001 to 2 wt. %.

13 . A solid antiperspirant stick obtained by the process of claim 1 .

Assignees

• Conopco Inc Dba Unilever

Inventors

• Ciampi Elisabetta
• Marriott Robert Edward
• Roberts Louise Jannette
• Trow Victoria Louise
• Whitehead Emma Jayne

Classifications

• A61K8/361 Primary

  Carboxylic acids having more than seven carbon atoms in an unbroken chain; Salts or anhydrides thereof · CPC title

• A61K8/0229

  Sticks · CPC title

• A61K8/922

  of vegetable origin · CPC title

• A61Q15/00

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

• A61K8/39

  Derivatives containing from 2 to 10 oxyalkylene groups · CPC title