Personal cleansing compositions, methods and uses
A personal cleansing composition includes: (a) a surfactant system, wherein the surfactant system includes: from about 0.1% to about 5%, of a fatty acyl isethionate surfactant; from about 0.5% to about 40%, of a co-surfactant, wherein the co-surfactant is selected from the group consisting of an anionic surfactant being not an isethionate surfactant, a non-ionic surfactant, an amphoteric surfactant, a zwitterionic surfactant, and mixtures thereof; (b) from about 0.05% to about 5%, of a natural polysaccharide, a chemically modified natural polysaccharide, or a combination thereof; wherein the personal cleansing composition includes a first and second phase, wherein the first phase is an isotropic and micellar surfactant phase; wherein the second phase is a polymer liquid crystalline phase which includes polymer liquid crystals of the natural polysaccharide, the chemically modified natural polysaccharide, or the combination.
1. A personal cleansing composition comprising:
(a) a surfactant system, comprising about 0.1% to about 5% of a fatty acyl isethionate surfactant, by weight of the composition, and about 0.5% to about 40%, by weight of the composition of a fatty acyl sarcosinate;
(b) about 0.25% to about 2%, by weight of the composition, of one or more natural polysaccharides; wherein one or more natural polysaccharides are chosen from xanthan gum, carrageenan gum, xanthan gum/locust bean gum, xanthan gum/guar gum, or mixtures thereof;
(c) about 0.5% to about 3% of an electrolyte chosen from sodium or potassium citrate, calcium chloride, calcium bromide, zinc chloride, barium chloride, calcium nitrate, potassium chloride, sodium chloride, potassium iodide, sodium bromide, ammonium bromide, sodium sulfate, or mixtures thereof;
(d) water;
(e) an isotropic and micellar surfactant phase that includes the surfactant system; and
(f) a polymer liquid crystalline phase comprising the natural polysaccharide, wherein the composition is free of from alkyl sulfate and alkyl ether sulfate types of surfactants, has a yield stress τ y of 0.005 to 3 Pa according to the Herschel-Bulkley Rheology Test Method, a flow viscosity of 3 Pa·s to 100 Pa·s at 25° C. at a shear rate of 1.5 s −1 according to the Flow Viscosity Test Method, and a transmittance at 25° C. and 640 nm of 25% to 90% according to the Optical Clarity Test Method.
2. The personal cleansing composition of claim 1 , wherein the polymer liquid crystals further comprise one ingredient of the surfactant system.
3. The personal cleansing composition of claim 1 , wherein the natural polysaccharide or the chemically modified natural polysaccharide is present in the polymer liquid crystalline phase at a level from about 1% to about 30% by total weight of the polymer liquid crystalline phase.
4. The personal cleansing composition of claim 1 , wherein the fatty acyl isethionate surfactant is an isethionate according to the general Formula (I):
wherein R 1 is a saturated or unsaturated, straight or branched, alkyl or alkenyl chain with from 6 to 30 carbon atoms, R 2 and R 3 are each independently H or (C 1 -C 4 ) alkyl, and M + is an alkali metal; or M + is an alkali-earth metal; or M + is an ammonium or a substituted ammonium cation.
5. The personal cleansing composition of claim 1 , wherein the fatty acyl sarcosinate is a sarcosinate according to the general formula (II):
wherein R is a saturated or unsaturated, straight or branched or alkenyl, and M + is H, a sodium, potassium or ammonium cation.
6. The personal composition of claim 1 , wherein the composition exhibits a yield stress value τ y from about 0.005 Pa to about 3 Pa according to the Herschel-Bulkley Rheology Test Method.
7. The personal composition of claim 1 , wherein the composition exhibits a flow viscosity from about 3 Pa·s to about 100 Pa·s at 25° C. at a shear rate of 1.5 s −1 according to the Flow Viscosity Test Method.