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Skin care compositions comrpising particle-sized organic UV-filters

IP.com Disclosure Number: IPCOM000034144D
Publication Date: 2005-Jan-18

Publishing Venue

The IP.com Prior Art Database

Abstract

Described is a method for the treatment of the human skin with a skin-care composition compromising applying to the skin a composition comprising (a) 0.1 to 5% b.w. of a skin functional active agent, (b) 0.05 to 20% b.w. of a carrier system for the skin active agent, and (c) 0.1 to 10% of a UV filter in micro-particle form, wherein the micro-particle sized UV filter remains on the skin surface.

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Skin care compositions comrpising particle-sized organic UV-filters

The present invention refers to a method for the treatment of the human skin with a skin functional actives containing skin-care composition comprising particle-sized UV-filters.

Organic filters like parabenes, benzophenones etc. have been integrated into appropriate cosmetic sunscreen formulations in order to protect the skin from time-limeted sunburn- including UV radiations, such as beach holidays, mountain-biking etc..

With the awareness of UV radiation and in particular UV-A radiation being the main reason for premature skin aging and - especially in Asian countries - of undesired tanning - such chemical sunscreens are increasingly used for daily skin protection of persons permanently exposed to UV radiation like farmworkers etc. and as additional actives in cosmetic daily creams. Such skin care formulations for daily use commonly contain skin actives such as vi- tamins etc. which have to be combined with carrier systems for entering the lipid part of the stratum corneum.

Unfortunately, specific organic sunscreen molecules may have skin-pentetration enhancing properties or they can be transported into the skin by the mentioned carrier systems. Such observations and the fact that sunscreen application is changing from occasional to daily use have raised concern about possible adverse reaction during chronic exposure to sunscreen formulations. Therefore, for long-term use it is suggested to preferably apply formulations containing physical sunscreens rather than chemical filters.

In contrast to chemical sunscreens the sunprotection effect of physical sunscreens such as ZnO2 and TiO2 is achieved by reflecting UV-radiation. Unfortunately, TiO2 generates unde- sired radicals on the skin if the particles are not properly coated. Moreover, an outstanding formulation of sunscreen compositions containing physical filters presents a major challenge. Insufficient spreadability and a whitish reflection of the skin after application often limits the cosmetical acceptance of such formulations.

It was now found that particle-sized organic UV-filters have not the disatvantage of skin- penetration and combine the benefits of current inorganic micropigments and of soluble or- ganic absorbers

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Therefore, the present invention refers to a method for the treatment of the human skin with a skin-care composition comprising applying to the skin a composition comprising
(a) 0.1 to 5 % b.w. of a skin functional active agent,
(b) 0.05 to 20 % b.w. of a carrier system for the skin active active agent, and
(c) 0.1 to 10 % b.w. of a UV filter in micro-particle form, wherein the micro-particle sized UV filter remains on the skin surface.

An skin active agent suitable as component (a) is an ingredient or a mixture of ingredients which is approved for dermal, preferably transdermal or topic administration.

Examples to be listed are: - active agents which have cleansi...