The present invention relates to an improved controlled delivery system
that can be incorporated in soap bars to enhance deposition of active
ingredients and sensory markers onto skin. The carrier system also
provides controlled release or prolonged release of these actives from
the skin over an extended period of time. The controlled delivery system
of the present invention comprises substantially free-flowing, powder
formed of solid hydrophobic, positively charged, nanospheres of
encapsulated active ingredients, that are encapsulated in moisture
sensitive microspheres. The high cationic charge density of the
nanosphere improves deposition of active ingredients onto skin. The high
cationic charge density on the nanosphere surface is created by
incorporating a cationic conditioning agent into the solid hydrophobic
matrix of the nanospheres, by incorporating a cationic charge "booster"
in the moisture sensitive microsphere matrix, or by using a cationic
conditioning agent in the nanosphere matrix in conjunction with a
cationic charge "booster" in the microsphere matrix. The invention also
pertains to soap products comprising the controlled release system of the
present invention.