Drug – bio-affecting and body treating compositions – Preparations characterized by special physical form – Cosmetic – antiperspirant – dentifrice
Patent
1995-03-10
1998-08-25
Clardy, S. Mark
Drug, bio-affecting and body treating compositions
Preparations characterized by special physical form
Cosmetic, antiperspirant, dentifrice
424 7011, 510119, 510130, 514847, 514937, 524501, A61K 700
Patent
active
057981086
DESCRIPTION:
BRIEF SUMMARY
This application is a 371 of PCT/FR93/00714 filed Jul. 13, 1993.
The present invention relates to a cosmetic or dermatological composition provided in the form of a gelled water/oil/water triple emulsion, to a process for its preparation and to its applications in the cosmetic and dermatological fields.
Emulsions have been used for several years in products for the cosmetic treatment of the skin, especially in the cosmetics field. These emulsions are generally oil-in-water (O/W) or water-in-oil (W/O) emulsions.
Triple emulsions of the W/O/W type, or alternatively of the O/W/O type, are also used in cosmetics or in dermatology. However, such emulsions have many problems associated with their manufacture or alternatively problems of stability over time, especially when active substances which may have a tendency to destabilize the prepared emulsions are introduced into these emulsions.
Patent Application EP-A-0,345,075 (UNILEVER) describes W/O/W triple emulsions in which the continuous external phase is gelled and which contain an osmotic pressure agent in the internal aqueous phase, this agent attracting the water of the external phase through the oily phase. The process for preparing these gelled emulsions consists in dispersing a water-in-oil emulsion, the aqueous phase of which contains an osmotic pressure agent, in a solution of a gelling agent, of the polysaccharide, gelatin or other protein type. However, these emulsions have drawbacks. The osmotic pressure difference between the internal aqueous phase and the external aqueous phase causes water to leak from the external aqueous phase to the internal aqueous phase, and thus causes a swelling of the internal aqueous globules and a high concentration of gelling agent in the external aqueous phase, resulting in a product which is too gelatinous.
Patent Application EP-A-0,281,394 (RICHARDSON VICKS) relates to an O/W/silicone emulsion. This is a very specific emulsion, obtained by introduction of a standard O/W emulsion into a silicone-containing oily phase which constitutes the external oily phase. This emulsion contains various surface-active agents which act as emulsifiers in the O/W emulsion.
However, it is known that the use of a large amount of surface-active agents in an emulsion for cosmetic use may cause irritation or allergy-type skin reactions.
It should thus be sought to minimize the amounts of surface-active agents, while at the same time not destabilizing the emulsion.
The Applicant has succeeded in overcoming the difficulties, both technical and cosmetic, associated with the triple emulsions of the prior art and in obtaining a triple emulsion possessing a novel texture, advantageous cosmetic properties and good stability, without containing surfactant in the external phase.
The triple emulsion according to the invention is a gelled water/oil/water (W/O/W) emulsion, in which the water/oil primary emulsion is distributed homogeneously with globules between 0.5 and 50 .mu.m in size, this imparting a smooth and shiny appearance thereto. The triple emulsion according to the invention is also gelled, creamy, fresh, soft, non-greasy and stable.
The subject of the invention is thus a triple emulsion having the characteristics defined below.
Another subject of the invention consists of the process for the preparation of such an emulsion.
A further subject of the invention is the cosmetic or dermatological use of such an emulsion.
Other subjects of the invention will become apparent on reading the description and the examples which follow.
The gelled water/oil/water triple emulsion in accordance with the invention is essentially charaterized in that it contains:
(A) a fatty phase comprising at least one wax with a melting point above or equal to 60.degree. C., constituting with an aqueous phase the W/O primary emulsion;
(B) a dilution oil;
(C) a gelled continuous external aqueous phase comprising at least one fatty chain-containing gelling agent of the C.sub.3 -C.sub.6 monoethylenic carboxylic acid or acid anhydride/fatty chain-containing acrylic este
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Nadaud Jean Francois
Sebillotte Laurence
"L'Oreal"
Clardy S. Mark
Harrison Robert H.
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