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.