Drug – bio-affecting and body treating compositions – Topical body preparation containing solid synthetic organic... – Skin cosmetic coating
Patent
1995-10-05
1997-07-22
Mosley, Terressa
Drug, bio-affecting and body treating compositions
Topical body preparation containing solid synthetic organic...
Skin cosmetic coating
424 43, 424 59, 424 7802, 424400, 424401, 424407, 514 63, 514937, 514938, 514944, 514957, A61K 31765
Patent
active
056501463
DESCRIPTION:
BRIEF SUMMARY
This application is a 371 of PCT/EP94/00638, Mar. 4, 1994.
The invention is concerned with silicone based skin care products. More particularly the invention is concerned with such products which are applied to the skin as aerosols and form a clear gel on the skin.
BACKGROUND OF THE INVENTION
Gels which are applied to the skin as aerosols are known in the art. In such products the volatile propellant acts as a diluent for the viscous gel in the aerosol container. When applied to the skin, the propellant evaporates and leaves the product as a gel or foam. Such products are exemplified e.g in: JP-A-4.103526 which describes foamy gels for pain relief and cooling of the skin, containing (polyoxyethylene) sorbitan fatty acid esters as the gellifying agent; EP-A-0 134 964 describing liquid products which contain polyoxypropylene-polyoxyethylene copolymers as the gelling agent and a medicament and which are applied as a foam and transform into a gel on contact with the skin; EP-A-0 423 695 describing a similar product which contains polyoxyetylene surfactant and is applied as a foam; EP-A-0 207 022 describing a product which is applied from aerosol containers and contains solid particles of water absorbent material such as starch or polyacrylamide and in addition some gel-forming polymer; U.S. Pat. Nos. 4,495,168 and 4,495,169 both describing liquid products which contain polyoxyethylene-polyoxypropylene or polyoxyethylene-polyoxybutylene block copolymers as the gelling agent and which form a gel on contact with the skin and are useful for various applications such as shaving cream. However, none of these products appear to form a clear gel on the skin.
Clear gels, on the other hand, are much appreciated as skin care products for various purposes because of their attractive appearance, and can be made from various starting materials. Silicone based clear gels are are well known among such products. Examples have been described in U.S. Pat. Nos. 4,673,570, 4,900,542, WO 92/05767 and GB-A-2 079 300. The advantages of silicone based microemulsion gels have been described in the brochure "Silicone Emulsifiers" of A. Zombeck, Dow Corning Europe S. A. However, none of these products have been described as being suitable for application to the skin as an aerosol, while still producing the desired clear gel after application.
SUMMARY OF INVENTION
It has now been found that certain silicone based skin care products, comprising a silicone based water-in-oil micro-emulsion diluted with a volatile diluent, can be applied to the skin as an aerosol and still produce a non-running clear gel on the skin. Thus, the invention provides silicone based skin care products for application as an aerosol and forming a clear gel on the skin, which comprise 20-70% w/w of a silicone based water-in-oil microemulsion and 30-80% w/w of a volatile diluent.
For the purposes of this invention an "aerosol" is defined as a multitude of very fine droplets of liquid as is normally produced from standard pressurized aerosol containers or pump-spray containers, such as are currently in use for many cosmetic and skin care products. When such aerosol, wherein the droplets of liquid consist of silicone based skin care product according to the invention, comes in contact with the skin, the volatile diluent evaporates and the aerosol leaves a clear, non-running gel on the skin Also, for the purposes of this invention a "silicone based water-in-oil microemulsion is a microemulsion wherein the emulsifier is mainly or exclusively a silicone emulsifying agent and the oil phase contains an appreciable quantity of polyorganosiloxane-type liquid. Accordingly, a silicone based skin care product as referred to herein is a skin care product comprising such "silicone based water-in-oil microemulsion".
Thus, the invention also provides a method for applying a silicone based clear gel to the skin, the method comprising the steps of filling a silicone based skin care product, comprising 20-70% w/w of a silicone based water-in-oil microemulsion and 30-80% w/w of a v
REFERENCES:
patent: 4900542 (1990-02-01), Parrotta et al.
patent: 5162378 (1992-11-01), Guthauser
patent: 5176898 (1993-01-01), Goldberg et al.
Mosley Terressa
Quest International B.V.
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