Aqueous concentrates of isethionate, taurate and betaine
The invention provides aqueous concentrates comprising, based on the total composition, A) 0.1 to 8.0% by weight, preferably 3.0 to 7.0% by weight, of one or more isethionates of formula (1) RCOOCH 2 CH 2 SO 3 M (1) in which R is a linear or branched alkyl group or alkenyl group and M is a counterion, B) 0.1 to 8.0% by weight of one or more taurates of formula (2) R 1 CON(CH 3 )CH 2 CH 2 SO 3 X (2) in which R 1 and X have the same meaning as R and M and C) 0.1 to 40.0% by weight of one or more alkylbetaines of formula (3) in which R 2 has the same meaning as R, with the proviso that the concentration of the sum of all surfactants with the formula 1, 2 and 3 is more than 20% by weight. These concentrates are flowable at room temperature and are transparent and also colorless.
1 . An aqueous concentrate comprising, based on the total composition,
A) 0.1 to 8.0% by weight of at least one isethionate of formula (1)
RCOOCH 2 CH 2 SO 3 M (1)
wherein
R is a linear or branched alkyl group having 6 to 30 carbon atoms or a linear or branched mono- or polyunsaturated alkenyl group having 6 to 30 carbon atoms and
M is a counterion,
B) 0.1 to 8.0% by weight of at least one taurate of formula (2)
R 1 CON(CH 3 )CH 2 CH 2 SO 3 X (2)
wherein which
R 1 is a linear or branched alkyl group having 6 to 30 carbon atoms or a linear or branched mono- or polyunsaturated alkenyl group having 6 to 30 carbon atoms and
X is a counterion,
C) 0.1 to 40.0% by weight of at least one alkylbetaine of formula (3)
wherein
R 2 is a linear or branched alkyl group having 6 to 30 carbon atoms or a linear or branched mono- or polyunsaturated alkenyl group having 6 to 30 carbon atoms, with the proviso that the concentration of the sum of all surfactants of the formula 1, 2 and 3 is more than 20% by weight.
2 . The aqueous concentrate as claimed in claim 1 , comprising compounds of formulae (1), (2) and (3), wherein R, R 1 or R 2 is the alkyl radical of coconut or lauryl acid.
3 . The aqueous concentrate as claimed in claim 1 , wherein the total amount by weight of all surfactants of formulae (1), (2) and (3) is 20 to 49%.
4 . The aqueous concentrate as claimed in claim 1 , wherein the total amount by weight of all surfactants of formulae (1), (2) and (3) is 25 to 35%.
5 . The aqueous concentrate as claimed in claim 1 , wherein the total amount by weight of all surfactants of formulae (1), (2) and (3) is 28 to 32%.
6 . The aqueous concentrate as claimed in claim 1 , wherein the total solids content, consisting of the surfactants of formulae (1), (2) and (3), and acids and salts, is 35 to 45% by weight.
7 . The aqueous concentrate as claimed in claim 1 , where the quantitative ratio of the compounds of formulae (1), (2) and (3) is 0.5 to 1.5:0.5 to 1.5:4.
8 . The aqueous concentrate as claimed in claim 1 , which has a color number of at most 60 Hazen.
9 . The aqueous concentrate as claimed in claim 1 , which has a transparency of at most 10 NTU.
10 . An aqueous concentrate comprising, based on the total composition,
A) 3.0 to 7.0% by weight of at least one isethionate of formula (1)
RCOOCH 2 CH 2 SO 3 M (1)
wherein
R is the hydrocarbon radical of coconut acid and
M is an alkali metal ion,
B) 3.0 to 7.0% by weight of at least one taurate of formula (2)
R 1 CON(CH 3 )CH 2 CH 2 SO 3 X (2)
wherein
R 1 is the hydrocarbon radical of coconut acid and
X is an alkali metal ion,
C) 15.0 to 25.0% by weight of at least one of alkylbetaine of formula (3)
wherein
R 2 is the hydrocarbon radical of coconut acid,
D) 5.0 to 9.0% by weight of sodium chloride,
E) 58 to 62% by weight of water and
F) 0.1 to 2% by weight, of fatty acid,
11 . A cosmetic, dermatological or pharmaceutical formulation comprising an aqueous concentrate as claimed in claim 1 .