Self-tanning compositions having reduced maillard reaction malodor
The present invention provides novel cosmetic compositions for artificially tanning the skin, utilizing skin-tanning agents and odor-mitigating materials, such as specifically defined starch materials. The compositions reduce the undesirable odors associated with the reaction between the skin-tanning agents, such as dihydroxyacetone, and the skin (chemically known as the Maillard reaction). The method of using those compositions and of formulating those compositions is also disclosed.
1. A skin-tanning composition which comprises:
(a) from about 0.1% to about 20% of a skin-tanning agent selected from dihydroxyacetone, erythrulose, and mixtures thereof;
(b) from about 0.1% to about 10% of an odor-mitigating material selected from starch-based polysaccharides that contain at least 50% amylopectin and which are treated such that their crystal structure is not present; and
(c) a cosmetically acceptable carrier;
wherein the starch-based polysaccharide is selected from waxy maize starch, aluminum starch octenylsuccinate, corn starch, and mixtures thereof.
2. The skin-tanning composition of claim 1 wherein the polysaccharide contains at least 70% amylopectin.
3. The skin-tanning composition of claim 1 wherein the polysaccharide is treated by heating in a solvent to a temperature of from about 50° C. to about 90° C. for a period of from about 5 minutes to about 24 hours.
4. The skin-tanning composition of claim 1 , which includes from about 1% to about 10% of the odor-mitigating material.
5. The skin-tanning composition according to claim 4 , which contains from about 3% to about 7% of the odor-mitigating material.
6. The skin-tanning composition according to claim 1 , which includes from about 2% to about 8% odor-mitigating material.
7. The skin-tanning composition according to claim 4 , wherein the composition is formulated as an emulsion, gel, spray, foam, wipe, liquid, solid, or powder.
8. The skin-tanning composition according to claim 7 , wherein the composition is formulated as an oil-in-water emulsion.
9. The skin-tanning composition according to claim 1 , which includes from about 0.1% to about 10% of the skin-tanning agent.
10. The skin-tanning composition of claim 1 wherein the odor-mitigating material is corn starch.
11. A method of reducing the Maillard reaction odor generated when a sunless tanning composition, containing a skin-tanning agent selected from dihydroxyacetone, erythrulose, and mixtures thereof, is applied to the skin, comprising including in said composition from about 0.1% to about 10% of an odor-mitigating material selected from starch-based polysaccharides that contain at least 50% amylopectin, wherein the polysaccharide is treated such that its crystal structure is not present;
wherein the starch-based polysaccharide is selected from waxy maize starch, aluminum starch octenylsuccinate, corn starch, and mixtures thereof.
12. The method according to claim 11 , which utilizes from about 1% to about 10% odor-mitigating material.
13. A method of providing an artificial tan to human skin which comprises applying an effective amount of the composition of claim 1 to the skin.
14. A method of providing an artificial tan to human skin which comprises applying an effective amount of the composition of claim 6 to the skin.
15. A method for making the composition of claim 1 wherein the starch is heated in water to a temperature of from about 70° C. to about 80° C., for from about 10 to about 60 minutes, adding said water phase to an oil phase with stirring to form an emulsion, and then adding the skin-tanning agent to said emulsion.
16. The method of claim 15 wherein the water phase is heated to about 75-80° C.
17. The method of claim 16 wherein the water phase is subjected to high shear mixing during the heating step.