Personal cleansing compositions, methods and uses

1. A personal cleansing composition comprising:

(i) about 30% to about 50%, by weight of the composition, of a surfactant, wherein the surfactant comprises a C13 alkyl sulfate anionic surfactant and a cosurfactant, wherein the C13 alkyl sulfate anionic surfactant consists of:

(a) a linear C13 alkyl sulfate; wherein the C13 alkyl sulfate anionic surfactant consists of less than about 40% by weight of the C13 alkyl sulfate anionic surfactant of the linear C13 alkyl sulfate, and

(b) more than about 60% by weight of the C13 alkyl sulfate anionic surfactant of a 2-branched C13 alkyl sulfate anionic surfactant, wherein the 2-branched C13 alkyl sulfate anionic surfactant comprises:

about 25% or less by weight of the 2-branched C13 alkyl sulfate anionic surfactant of 2-pentyl octyl sulfate anionic surfactant, and more than about 25% by weight the 2-branched C13 alkyl sulfate anionic surfactant of 2-methyl dodecyl sulfate anionic surfactant; and

(c) less than about 5% by weight of the C13 alkyl sulfate anionic surfactant of other branched C13 alkyl sulfate anionic surfactant,

wherein a, b and c add up to about 100% by weight of the C13 alkyl sulfate anionic surfactant;

(ii) about 4.5% to about 25%, by weight of the composition, of a perfume;

(iii) about 3% to about 15%, by weight of the composition, of a hydric solvent; and

(iv) water;

wherein the composition is structured; and

wherein the personal cleansing composition comprises a viscosity at about 0.10 l/sec of from about 10 Pa·s to about 1200 Pa·s.

2. The personal cleansing composition of claim 1 , wherein the personal cleansing composition is a stable gel and has an elastic modulus G′ at 1 Hz of about 70 Pa to about 2500 Pa according to the G′ and G″ Test Method.

3. The personal cleansing composition according to claim 1 , wherein the C13 alkyl sulfate anionic surfactant consists of:

(i) less than about 30%, by weight of the C13 alkyl sulfate anionic surfactant, of the linear C13 alkyl sulfate;

(ii) more than about 70%, by weight of the C13 alkyl sulfate anionic surfactant, of the 2-branched C13 alkyl sulfate anionic surfactant; and

(iii) less than about 3%, by weight of the C13 alkyl sulfate anionic surfactant of other branched C13 alkyl sulfate anionic surfactants.

4. The personal cleansing composition according to claim 1 , wherein the 2-branched C13 alkyl sulfate anionic surfactant comprises:

(i) less than about 20%, by weight of the 2-branched C13 alkyl sulfate anionic surfactant, of 2-pentyl octyl sulfate anionic surfactant; and

(ii) more than about 30%, by weight of the 2-branched C13 alkyl sulfate anionic surfactant, of 2-methyl dodecyl sulfate anionic surfactant.

5. The personal cleansing composition according to claim 1 , wherein the personal cleansing composition is substantially free or free of alkoxylated anionic sulfate surfactant.

6. The personal cleansing composition according to claim 1 , wherein the weight percent of perfume is about 2% to about 90%, by weight of the surfactant.

7. The personal cleansing composition according to claim 1 , wherein the weight percent of the hydric solvent is about 5% to about 35%, by weight of the surfactant.

8. The personal cleansing composition according to claim 1 , wherein the cosurfactant is present at about 2.5% to about 5%, by weight of the composition.

9. The personal cleansing composition of claim 8 , wherein the cosurfactant is chosen from a zwitterionic surfactant, an amphoteric surfactant, a nonionic surfactant, or mixtures thereof.

10. The personal cleansing composition according to claim 8 , wherein the ratio of the weight percent of C13 alkyl sulfate anionic surfactant to the weight percent of the cosurfactant is 20:1 to 4:1.

11. The personal cleansing composition according to claim 1 , wherein the composition comprises about 5% to about 62.5%, by weight of the composition, of water.

12. The personal cleansing composition according to claim 1 , wherein the composition has a microemulsion phase.

13. The personal cleansing composition according to claim 12 , wherein the microemulsion phase is in equilibrium with a lamellar phase.

14. The personal cleansing comprising according to claim 1 , wherein the hydric solvent is a glycol comprising 3 to 12 carbon atoms or a glycol ether comprising 4 to 12 carbon atoms.

15. The personal cleansing comprising according to claim 14 , wherein the hydric solvent is a glycol chosen from hexylene glycol, butylene glycol, pentylene glycol, heptylene glycol, propylene glycol, or mixtures thereof.

16. The personal cleansing composition according to claim 14 , wherein the hydric solvent is a glycol ether chosen from dipropylene glycol, diethylene glycol, dibutylene glycol, or mixtures thereof.

17. The personal cleansing comprising according to claim 1 , wherein the composition is not a ringing gel.

18. The personal cleansing comprising according to claim 1 , wherein at least a portion of the composition becomes a microemulsion upon dilution with water of about 3:1 by weight (water:composition) to about 10:1 by weight (water:composition).

19. A personal cleansing composition comprising:

(i) a surfactant, wherein the surfactant comprises an alkyl sulfate anionic surfactant and a cosurfactant, wherein the alkyl sulfate anionic surfactant consists of:

(a) a linear alkyl sulfate; wherein the alkyl sulfate anionic surfactant consists of less than about 40% by weight of the alkyl sulfate anionic surfactant of the linear alkyl sulfate, and

(b) more than about 60% by weight of the alkyl sulfate anionic surfactant of a 2-branched C13 alkyl sulfate anionic surfactant, wherein the 2-branched C13 alkyl sulfate anionic surfactant comprises:

about 25% or less by weight of the 2-branched C13 alkyl sulfate anionic surfactant of 2-pentyl octyl sulfate anionic surfactant, and more than about 25% by weight the 2-branched C13 alkyl sulfate anionic surfactant of 2-methyl dodecyl sulfate anionic surfactant;

(c) optionally one or more other branched alkyl sulfate anionic surfactants,

wherein a, b and c add up to about 100% by weight of the alkyl sulfate anionic surfactant;

wherein the surfactant is substantially free of ethoxylated anionic sulfate surfactants,

(ii) a perfume at a weight ratio perfume: surfactant of at least about 1:10;

(iii) a hydric solvent at a weight ratio hydric solvent: surfactant of at least about 2:9, between about 25% to about 50% water by weight of the composition;

wherein the personal cleansing composition comprises a viscosity at about 0.10 l/sec of from about 10 Pa·s to about 1200 Pa·s;

wherein the personal cleansing composition has an elastic modulus G′ at 1 Hz from about 70 Pa to about 2500 Pa according to the G′ and G″ Test Method as disclosed herein.

20. A method of providing similar or enhanced in-vitro bloom or fragrance skin deposition of a rinse-off microemulsion cleansing composition, comprising, providing a personal cleansing composition comprising a perfume and a synergistic combination of a C13 alkyl sulfate anionic surfactant and a hydric solvent, comprising:

(i) about 30% to about 50%, by weight of the composition, of a surfactant, wherein the surfactant comprises a C13 alkyl sulfate anionic surfactant and a cosurfactant, wherein the C13 alkyl sulfate anionic surfactant consists of:

(a) a linear C13 alkyl sulfate; wherein the C13 alkyl sulfate anionic surfactant consists of less than about 40% by weight of the C13 alkyl sulfate anionic surfactant of the linear C13 alkyl sulfate, and

(b) more than about 60% by weight of the C13 alkyl sulfate anionic surfactant of a 2-branched C13 alkyl sulfate anionic surfactant, wherein the 2-branched C13 alkyl sulfate anionic surfactant comprises:

about 25% or less by weight of the 2-branched C13 alkyl sulfate anionic surfactant of 2-pentyl octyl sulfate anionic surfactant, and more than about 25% by weight of the 2-branched C13 alkyl sulfate anionic surfactant of 2-methyl dodecyl sulfate anionic surfactant, and

(c) less than about 5% by weight of other branched C13 alkyl sulfate anionic surfactant,

wherein a, b and c add up to about 100% by weight of the C13 alkyl sulfate anionic surfactant;

(ii) about 4.5% to about 25%, by weight of the composition, of a perfume;

(iii) about 3% to about 15%, by weight of the composition, of a hydric solvent; and

water to obtain a personal cleansing composition containing a microemulsion then diluting diluting the personal cleansing composition with water at a weight ratio water:composition from about 2:1 to about 10:1, to form a rinse-off microemulsion cleansing composition comprising a micoemulsion phase comprising a portion of the perfume.