COMPOSITION EXHIBITING ENHANCED FORMULATION STABILITY AND DELIVERY OF TOPICAL ACTIVE INGREDIENTS
First Claim
1. A composition for topical application comprising as an active ingredient at least one of benzoyl peroxide and retinoid encapsulated in microcapsules having a core-shell structure, wherein said core includes said active ingredient, and wherein said shell comprises at least one metal oxide inorganic polymer obtained by a sol-gel process.
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Accused Products
Abstract
A therapeutic, cosmetic or cosmeceutic composition for topical application, capable of stabilizing an active ingredient and delivering the active ingredient, comprising a plurality of microcapsules having a core-shell structure. The microcapsules have a diameter of approximately 0.1 to 100 micron. The core of each microcapsule includes at least one active ingredient, and is encapsulated within a microcapsular shell. The shell is comprised of at least one inorganic polymer obtained by a sol-gel process, and the shell protects the active ingredient before topical application and is designed to release the active ingredient from the microcapsules following application. The composition is useful in encapsulating active ingredients, such as benzoyl peroxide, that are unstable in other formulation, or are irritating to the skin.
95 Citations
42 Claims
- 1. A composition for topical application comprising as an active ingredient at least one of benzoyl peroxide and retinoid encapsulated in microcapsules having a core-shell structure, wherein said core includes said active ingredient, and wherein said shell comprises at least one metal oxide inorganic polymer obtained by a sol-gel process.
- 22. A method for treating a skin condition in a subject in need thereof, the method comprising topically applying onto the skin a composition comprising as an active ingredient at least one of benzoyl peroxide and retinoid encapsulated in microcapsules having a core-shell structure, wherein said core includes said active ingredient, and wherein said shell comprises at least one metal oxide inorganic polymer obtained by a sol-gel process.
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34. A process for preparing a composition for topical application that comprises, as active ingredient, one or both of benzoyl peroxide and a retinoid, the process comprising encapsulating the active ingredient in microcapsules having a core-shell structure, wherein said core includes said active ingredient, and wherein said shell comprises at least one inorganic polymer, the microcapsules being obtained by a sol-gel process that comprises:
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preparing a hydrophobic solution or a hydrophobic dispersion comprising at least one sol-gel precursor and said active ingredient; emulsifying said hydrophobic solution or dispersion in an aqueous solution under high shear forces, so as to obtain an emulsion containing said active ingredient; and
(c) mixing and stirring said emulsion, with a second aqueous solution, at a selected pH, so as to obtain said active ingredient encapsulated in said microcapsules. - View Dependent Claims (35, 36, 37, 38, 39, 40, 41, 42)
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Specification