Anti-dandruff shampoo
The invention relates to an anti-dandruff shampoo comprising: —a) from 0.1 to 5 wt. % of an anti-dandruff zinc salt; b) from 1 to 8 wt. % of an alkyl glycinate and/or alkyl carboxyglycinate; c) from 2 to 16 wt. % of an alkyl sulphate and/or an ethoxylated alkyl sulfate anionic surfactant; and, d) from 1 to 10 wt. % of a fatty acyl isethionate product which product comprises 40 to 80 wt. % fatty acyl isethionate and 15 to 50 wt. % free fatty acid and/or fatty acid salt and to the use of a surfactant system comprising components b) to d) to provide an improvement to the skin stratum corneum barrier.
1. An anti-dandruff shampoo comprising: —
a) from 0.1 to 5 wt. % of an anti-dandruff zinc salt;
b) from 1 to 8 wt. % of an alkyl glycinate and/or alkyl carboxyglycinate;
c) from 2 to 16 wt. % of an alkyl sulphate and/or ethoxylated alkyl sulfate anionic surfactant; and,
d) from 1 to 10 wt. % of a fatty acyl isethionate product which product comprises 40 to 80 wt. % fatty acyl isethionate and 15 to 50 wt. % free fatty acid and/or fatty acid salt.
2. A shampoo according to claim 1 , wherein the anti-dandruff zinc salt is zinc pyrithione (ZnPTO).
3. A shampoo according to claim 1 , wherein the anti-dandruff zinc salt is present at a level of from 0.25 to 2.5 wt. %.
4. A shampoo according to claim 1 , wherein the alkyl sulfate and/or ethoxylated alkyl sulfate anionic surfactant comprises from 3 to 12 wt. %, preferably from 4 to 10 wt. % of sodium lauryl ether sulfate having an average degree of ethoxylation of from 0.5 to 3.
5. A shampoo according to claim 1 , wherein the alkyl glycinate and/or alkyl carboxyglycinate is present at a level of from 1 to 8 wt. %, preferably from 2 to 6 wt. %, and has an alkyl group comprising of from C 8-22 carbon atoms, wherein the glycinate is in the form of a salt with a solubilising cation such as sodium, potassium, ammonium or substituted ammonium.
6. A shampoo according to claim 1 , wherein the glycinate is sodium alkyl carboxylglycinate having an alkyl group of from C 8-22 carbon atoms.
7. A shampoo according to claim 1 , additionally comprising from 0.1 to 10 wt. % of a betaine surfactant, preferably an alkyl amidopropyl betaine.
8. A shampoo according to claim 1 , additionally comprising from 0.1 to 5 wt. % of a cationic polymer, preferably a cationic polysaccharide polymer.
9. A shampoo according to claim 1 , comprising: —
a) from 0.25 to 2.5 wt. % of zinc pyrithione;
b) from 2 to 6 wt. % of sodium alkyl carboxylglycinate having an alkyl group of from C 8-22 carbon atoms;
c) from 4 to 10 wt. % of sodium lauryl ether sulfate having an average degree of ethoxylation of from 0.5 to 3;
d) from 1 to 10 wt. % of a fatty acyl isethionate product which product comprises 40 to 80 wt. % fatty acyl isethionate and 15 to 50 wt. % free fatty acid and/or fatty acid salt; and,
e) from 0.1 to 5 wt. % of cocamidopropyl betaine.