US 7,115,282 B2Granted

Multi component controlled release system for anhydrous cosmetic compositions

AssigneeSalvona IP LLC

InventorsAdi Shefer, Shmuel David Shefer

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Abstract

The present invention relates to an improved controlled release system that can be incorporated into anhydrous cosmetic formulations and can encapsulate different types of fragrances, flavors, active ingredients, or combinations of fragrances, flavors, and various active ingredients. The controlled delivery system of the present invention is substantially free-flowing powder formed of solid hydrophobic nano-spheres that are encapsulated in a moisture sensitive micro-spheres. The fragrances, flavors, and active ingredients encapsulated in the nano-spheres can be the same or different from those encapsulated in the micro-sphere. The encapsulation of one or more fragrances, flavors or active agents in the various components of the system, such as nano-spheres and micro-spheres, provides odor or flavor transition (change in odor character or change in flavor character) during the use of the product, in response to moisture, such as wetting the lips, perspiration, and the like. The incorporation of the controlled release system of the present invention into anhydrous cosmetic formulations was found to provide moisture triggered release, as well as prolonged release of the fragrances, flavors, and active ingredients that are encapsulated in the solid hydrophobic nano-spheres over an extended period of time.

Claims19

Dependent claims

An anhydrous composition comprising:

a plurality of solid nano-spheres, each of said solid nano-spheres comprising an effective amount of a first active agent, said plurality of nano-spheres are formed of a hydrophobic material, said hydrophobic material is selected from one or more of the group consisting of natural wax, synthetic wax, vegetable wax, natural wax and silicon copolymer, synthetic wax and silicon copolymer, fatty acid esters, fatty alcohols, solid hydrogenated plant oil, natural polymers and synthetic polymers, said plurality of nano-spheres being encapsulated in a moisture sensitive micro-sphere, said moisture sensitive micro-sphere is formed of a moisture sensitive matrix material, said moisture sensitive micro-sphere comprising a second active agent encapsulated in said moisture sensitive matrix material, said second active agent is the same or different than said first active agent, said first and second active agents being selected from the group consisting of fragrance, flavor, cosmetic agent, dermatological agent and pharmaceutical agent, said moisture sensitive micro-sphere dissolves to release said second active agent and said plurality of nano-spheres upon contact with moisture from the skin or lips to provide a burst of said second active agent and said nano-spheres release said first active agent continuously thereafter for an extended period of time or said micro-sphere swells or softens upon contact with moisture from the skin or lips to slowly release said second active agent and said nanospheres and said nano-spheres release said first active agent continuously thereafter for an extended period of time in the range of a day to a few weeks.

A anhydrous cosmetic composition comprising a plurality of solid nano-spheres comprising a first active agent, said plurality of nano-spheres are formed of a hydrophobic material, said hydrophobic material is selected from one or more of the group consisting of natural wax, synthetic wax, vegetable wax, natural wax and silicon copolymer, synthetic wax and silicon copolymer, fatty acid esters, fatty alcohols, solid hydrogenated plant oil, natural polymers and synthetic polymers, said plurality of nano-spheres being encapsulated in a moisture sensitive micro-sphere, said moisture sensitive micro-sphere is formed of a moisture sensitive matrix material, said moisture sensitive matrix material is formed of about 1% to about 80% polyvinyl alcohol and about 1% to about 80% polysaccharide by weight of the matrix material, said moisture sensitive micro-sphere comprising a second active agent encapsulated in said moisture sensitive matrix material, said second active agent is the same or different than said first active agent, said first and second active agents being selected from the group consisting of:

fragrance, flavor, cosmetic agent, dermatological agent and pharmaceutical agent, said moisture sensitive micro-sphere dissolves to release said second active agent and said plurality of nano-spheres upon contact with moisture from the skin or lips to provide a burst of said second active agent and said nano-spheres release said first active agent continuously thereafter for an extended period of time or said micro-sphere swells or softens upon contact with moisture from the skin or lips to slowly release said second active agent and said nano-spheres, and said nano-spheres release said first active agent continuously thereafter for an extended period of time in the range of a day to a few weeks.

Dependencies are inferred from the claim text.