Use of special N-alkyl-N-acylglucamines for conditioning hair in hair washing agents
The invention relates to N-alkyl-N-acylglucamines of formula (I), which exhibit in hair-washing agents comprising an aqueous surfactant system with at least one anionic surfactant, a hair-conditioning effect, wherein, in formula (I), Ra is a linear or branched, saturated or unsaturated C 5 -C 21 alkyl radical and Rb represents a C 1 -C 4 alkyl radical, and wherein the N-alkyl-N-acylglucamines (I) contain at least 8 wt. %, based on the total amount of N-alkyl-N-acylglucamines (I), of compounds with a saturated C 16 -, C 18 - or a mono- or polyunsaturated C 18 fatty acid radical Ra—CO—.
1. A method for conditioning hair, comprising the step of contacting the hair with a hairwash composition comprising at least one N-alkyl-N-acylglucamine of the formula (I) and at least one aqueous surfactant system, wherein the at least one aqueous surfactant system comprises at least one alkyl sulfate and/or one alkyl ether sulfate as anionic surfactant,
where in the formula (I)
Ra is a linear saturated C 5 -C 21 alkyl radical, a branched saturated C 5 -C 21 alkyl radical, a linear unsaturated C 5 -C 21 alkyl radical, or a branched unsaturated C 5 -C 21 alkyl radical and
Rb is a C 1 -C 4 alkyl radical,
and wherein the at least one N-alkyl-N-acylglucamine according to formula (I) comprises at least 8 wt %, based on the total amount of the at least one N-alkyl-N-acylglucamine, of a saturated C 16 , C 18 , or singly or multiply unsaturated C 18 fatty acid radical Ra—CO—.
2. The method as claimed in claim 1 , wherein Rb is a methyl radical.
3. The method as claimed in claim 1 , wherein the radical Ra is derived from lauric acid, palmitic acid, stearic acid, oleic acid, linoleic acid, or linolenic acid.
4. The method as claimed in claim 1 , wherein the at least one N-alkyl-N-acylglucamine according to formula (I) comprises at least 8 wt % of an unsaturated C 18 fatty acid radical.
5. The method as claimed in claim 1 , wherein the at least one N-alkyl-N-acylglucamine according to formula (I) comprises at least 8 wt % of an unsaturated C 18 fatty acid radical and at least 30 wt % of a saturated C 12 fatty acid radical.
6. The method as claimed in claim 1 , wherein the aqueous surfactant system comprises an alkyl sulfate and/or an alkyl ether sulfate as anionic surfactant and a betaine surfactant.
7. The method as claimed in claim 1 , wherein the aqueous surfactant system comprises a linear C 8 -C 20 alkyl sulfate and/or a linear C 8 -C 20 alkyl ether sulfate.
8. The method as claimed in claim 7 , wherein the aqueous surfactant system comprises lauryl sulfate and/or a lauryl ether sulfate.
9. The method as claimed in claim 1 , wherein the aqueous surfactant system comprises an acylamidopropylbetaine or an alkylbetaine.
10. The method as claimed in claim 1 , for improving the ease of hair combing.
11. A hairwash composition comprising
(a) at least one N-methyl-N-acylglucamine of the formula (I) containing at least 8 wt %, based on the total amount of N-alkyl-N-acylglucamine, of a saturated C 16 , C 18 , or singly or multiply unsaturated C 18 fatty acid radical Ra—CO—, as component (A),
where in the formula (I)
Ra is a linear saturated C 5 -C 21 alkyl radical, a branched saturated C 5 -C 21 alkyl radical, a linear unsaturated C 5 -C 21 alkyl radical, or a branched unsaturated C 5 -C 21 alkyl radical and
Rb is a C 1 -C 4 alkyl radical,
(b) at least one anionic surfactant selected from the group consisting of the alkyl ether sulfates and alkyl sulfates, as component (B),
(c) optionally betaine surfactants as component (C),
(d) optionally further surfactants as component (D),
(e) refatting agents as component (E),
(f) water as component (F), and
(g) optionally further additives, such as preservatives, fragrances, and dyes, as component (G).
12. The hairwash composition as claimed in claim 11 , with the proviso that the hairwash composition contains no cationic polymers.
13. The hairwash composition as claimed in claim 11 in the form of a greasy hair, dry hair, stressed hair, or dandruff-affected hair hairwash composition, or of a color shampoo, baby shampoo, or sports shampoo.
14. The hairwash composition as claimed in claim 11 , wherein Rb is a methyl radical.
15. The hairwash composition as claimed in claim 11 , wherein the radical Ra is derived from lauric acid, palmitic acid, stearic acid, oleic acid, linoleic acid, or linolenic acid.
16. The hairwash composition as claimed in claim 11 , wherein the at least one N-alkyl-N-acylglucamine according to formula (I) comprises at least 8 wt % of an unsaturated C 18 fatty acid radical.
17. The hairwash composition as claimed in claim 11 , wherein the at least one N-alkyl-N-acylglucamine according to formula (I) comprises at least 8 wt % of an unsaturated C 18 fatty acid radical and at least 30 wt % of a saturated C 12 fatty acid radical.