Use of N-methyl-N-acylglucamines as thickening agents in surfactant solutions

Patent metadata

Field	Value
Publication number	US-10172774-B2
Application number	US-201314401789-A
Country	US
Kind code	B2
Filing date	May 29, 2013
Priority date	May 30, 2012
Publication date	Jan 8, 2019
Grant date	Jan 8, 2019

Abstract

N-methyl-N-acylglucamines are suitable as thickening agents in aqueous surfactant solutions containing one or more anionic surfactants of the group including alkyl ether sulfates and alkyl sulfates, the N-methyl-N-acylglucamines containing at least 60 wt.-% of N-methyl-N-acylglucamines that have a C12-, C14-acyl group or an unsaturated C18-acyl group and at the same time less than 5 wt.-% of N-methyl-N-acylglucamines that contain an acyl group <C12. The surfactant solutions are particularly used in cosmetic compositions.

First claim

The invention claimed is:

1. A method of thickening an aqueous cosmetic surfactant solution for cleaning hair and skin to a viscosity of at least 5000 mPas while comprising 1.0% weight or less of common salt, wherein the aqueous cosmetic surfactant solution contains a betaine surfactant and one or more anionic surfactants selected from the group consisting of alkyl ether sulfates and alkyl sulfates, comprising the step of adding a N-methyl-N-acylglucamine, wherein the N-methyl-N-acylglucamine contains at least 60 wt % of N-methyl-N-acylglucamines with a C 12 -, C 14 - or an unsaturated C 18 -fatty acid residue and simultaneously less than 5 wt % of N-methyl-N-acylglucamines that contain a fatty acid residue <C 12 and wherein the proportion of N-methyl-N-acylglucamines that contain an unsaturated C 18 -acyl group is at least 8 wt %, to the aqueous surfactant solution.

2. The method as claimed in claim 1 , wherein the at least 60 wt % of N-methyl-N-acylglucamines are compounds of formula (I),

wherein the residue R a is derived from lauric acid, myristyl acid, oleic acid, linoleic acid or linolenic acid.

3. The method as claimed in claim 1 , wherein the proportion of N-methyl-N-acylglucamides that contain a C 12 -, C 14 - or an unsaturated C 18 -acyl group is at least 70 wt %.

4. The method as claimed in claim 1 , wherein the proportion of N-methyl-N-acylglucamides that contain a C 12 -, C 14 - or an unsaturated C 18 -acyl group is at least 80 wt %.

5. The method as claimed in claim 1 , wherein the proportion of N-methyl-N-acylglucamides that contain a C 12 -, C 14 - or an unsaturated C 18 -acyl group is at least 90 wt %.

6. The method as claimed in claim 1 , wherein the proportion of N-methyl-N-acylglucamines that contain an acyl group <C 12 is less than 3 wt %.

7. The method as claimed in claim 1 , wherein the proportion of N-methyl-N-acylglucamines that contain an acyl group <C 12 is less than 2 wt %.

8. The method as claimed in claim 1 , wherein the proportion of N-methyl-N-acylglucamines that contain an unsaturated C 18 -acyl group is at least 15 wt %.

9. The method as claimed in claim 1 , wherein the aqueous surfactant solutions contain a linear C 8 -C 20 -alkyl sulfate and/or a linear C 8 -C 20 -alkyl ether sulfate.

10. The method as claimed in claim 1 , wherein the aqueous surfactant solutions contain lauryl sulfate and/or a lauryl ether sulfate.

11. The method as claimed in claim 1 , wherein the aqueous surfactant solutions contain an acylamidopropyl betaine or an alkyl betaine.

Assignees

• Klug Peter
• Mildner Carina
• Clariant Int Ltd

Inventors

• Klug Peter
• Mildner Carina

Classifications

• A61K8/442

  substituted by amido group(s) · CPC title

• A61K8/60

  Sugars; Derivatives thereof · CPC title

• A61K8/42 Primary

  Amides · CPC title

• A61Q5/02

  Preparations for cleaning the hair · CPC title

• A61Q19/10

  Washing or bathing preparations · CPC title