Personal care composition containing a biosurfactant
A sulfate-free personal care composition that includes a rhamnolipid surfactant and provides good cleaning and foaming properties. The rhamnolipid surfactant has a single rhamnose head group (i.e., mono-rhamno) and a single lipid tail group (i.e., mono lipid). The single lipid tail group has a carbon chain length of 10 to 13. The composition may include one or more additional surfactants selected from anionic surfactants, amphoteric surfactants, zwitterionic surfactants, non-ionic surfactants, cationic surfactants and combinations thereof, as long as the additional surfactant is free of sulfates. The composition also includes a dermatologically acceptable carrier.
1 . A surfactant system, comprising:
a rhamnolipid surfactant comprising a mono-rhamno-mono-lipid surfactant selected from Rha-C 10 , Rha-C 11 , Rha-C 12 , Rha-C 13 and combinations thereof; and di-rhamno-di-lipid surfactant
an additional surfactant selected from anionic surfactants, amphoteric surfactants, zwitterionic surfactants, non-ionic surfactants, cationic surfactants and combinations thereof, wherein the additional surfactant is free of sulfates;
wherein the rhamnolipid surfactant comprises about 25% to about 75%, by weight of the rhamnolipid surfactant, of the mono-rhamno-mono-lipid surfactant and about 25% to about 75%, by weight of the rhamnolipid surfactant, of the di-rhamno di-lipid surfactant, wherein the combination of mono-rhamno mono-lipid surfactant and di-rhamno di-lipid surfactant exhibit a synergistic Lather Volume according to the Foam Drainage method.
2 . The surfactant system of claim 1 , wherein the mono-rhamno-mono-lipid surfactant comprises a Rha-C 10 surfactant and a Rha-C 12 surfactant.
3 . The surfactant system of claim 2 , wherein the Rha-C 10 surfactant and Rha-C 12 surfactant are present at a weight ratio of Rha-C 10 to Rha-C 12 of about 1:10 to about 10:1.
4 . The surfactant system of claim 1 , wherein the additional surfactant is selected from cocoamphoacetates, cocoamphodiacetates, lauroamphoacetates, lauroamphodiacetates, amidobetaines, amidosulfobetaines, hydroxysultaines, isethionates, sarcosinates, sulfonates, taurates, alaninates, glycinates, glutamates, sulfosuccinates, and mixtures thereof.
5 . A personal care composition, comprising:
a) the surfactant system of claim 1 ; and
b) a dermatologically acceptable carrier.
6 . The personal care composition of claim 5 , wherein the composition exhibits a Lather Height of at least about 50 mm according to Lather Height Oil Method.
7 . The personal care composition of claim 5 , wherein the composition exhibits a Lather Height of at least about 150 mm according to Lather Height Dirt Method.
8 . The personal care composition of claim 5 , further comprising less than about 1%, by weight of the personal care composition, inorganic salt.
9 . The personal care composition of claim 5 , further comprising a dispersed gel network.
10 . The personal care composition of claim 9 , wherein the gel network comprises a fatty alcohol, a gel network surfactant, and a liquid carrier, and wherein the fatty alcohol is in the form of liquid crystal drops.
11 . The personal care composition of claim 9 , wherein the dispersed gel network comprises about 0.05 wt % or more of a fatty alcohol and about 0.01 wt % or more of a gel network surfactant selected from anionic surfactants, cationic surfactants, zwitterionic surfactants, non-ionic surfactants, and mixtures thereof.
12 . The personal care composition of claim 5 , further comprising a cationic polymer.
13 . The personal care composition of claim 5 , wherein the mono-rhamno-mono-lipid system comprises a Rha-C 10 surfactant and a Rha-C 12 surfactant.
14 . The personal care composition of claim 13 , wherein the Rha-C 10 surfactant and Rha-C 12 surfactant are present at a weight ratio of Rha-C 10 to Rha-C 12 of about 5:1 to 1:5.
15 . The personal care composition of claim 13 , wherein the Rha-C 10 surfactant and Rha-C 12 surfactant are about 1 wt % to about 80 wt % of the total surfactants in the personal care composition.
16 . A method of cleaning a target body surface, comprising:
wetting the target body surface with water;
applying about 1 to about 50 g of the personal care composition of claim 6 to the wetted body surface;
working the composition on the wetted bodily surface to produce a lather; and
rinsing the composition from the target body surface with water.