Drug – bio-affecting and body treating compositions – Preparations characterized by special physical form – Cosmetic – antiperspirant – dentifrice
Patent
1995-01-06
1996-10-22
Sweet, Mark D.
Drug, bio-affecting and body treating compositions
Preparations characterized by special physical form
Cosmetic, antiperspirant, dentifrice
524501, 424 7012, 424 7803, A61K 706
Patent
active
055674267
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to a cosmetic or dermatological composition which is in the form of a gelled triple water/silicone oil/water emulsion, to the process for its preparation and to its applications in the cosmetic field.
For many years emulsions have been used in products for cosmetic treatment of the skin, especially in the field of cosmetics. These emulsions are generally oil-in-water (O/W) or water-in-oil (W/O) emulsions.
Triple emulsions of the W/O/W or else the O/W/O type are also used in cosmetics or dermatology. However, such emulsions are subject to numerous problems during their production, or else to problems of stability over time, and in particular 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 triple W/O/W emulsions in which the continuous external phase is gelled and which contain an osmotic pressure agent in the internal aqueous phase, this agent drawing the water from the external phase through the oily phase. The process for the preparation of these gelled emulsions consists in dispersing a water-in-oil emulsion, in which the aqueous phase contains an osmotic pressure agent, in a solution of a gelling agent of the polysaccharide, gelatin or other protein type. These emulsions, however, have disadvantages. The difference in osmotic pressure between the internal aqueous phase and the external aqueous phase brings about an escape of water from the external aqueous phase to the internal aqueous phase, and therefore a swelling of the internal aqueous globules, and a high concentration of gelling agent in the external aqueous phase, leading ultimately to an excessively gelatinous product.
Patent Application EP-A-0 281 394 (RICHARDSON VICKS) relates to a O/W/silicone emulsion. This is a very specific emulsion obtained by introducing a conventional O/W emulsion into a silicone-containing oily phase which constitutes the outer oily phase. This emulsion contains various surfactants which act as emulsifiers in the O/W emulsion.
However, it is known that the use of a large quantity of surfactants in an emulsion for cosmetic use may cause skin reactions of the allergic or irritative type.
It is therefore necessary to seek to minimize the quantities of surfactants, while not destabilizing the emulsion.
It is also known that the conventional oils used in the emulsions impart a greasy feel and are often comedogenic.
The Applicant has therefore sought to replace these conventional oils with oils which do not impart a greasy feel and which, moreover, guarantee appropriate moisturizing of the skin.
The applicant has succeeded in overcoming the difficulties, both technical and cosmetic, which are connected with the triple emulsions of the prior art, and in obtaining a triple emulsion which has an appearance and a feel which are completely original, as well as noteworthy stability properties.
The triple emulsion according to the invention is a gelled water/silicone oil/water (W/Si/W) emulsion in which the primary water/silicone oil emulsion is distributed homogeneously with globules of a size between 0.5 and 50 .mu.m, giving it a smooth and shiny appearance. The triple emulsion according to the invention is in addition gelled, translucent, unctuous, fresh, soft, non-greasy and stable.
One subject of the invention is therefore a triple emulsion which has the characteristics defined below.
Another subject of the invention consists of the process for the preparation of such an emulsion.
Yet another subject of the invention is the cosmetic or dermatological use of such an emulsion.
Other subjects of the invention will become evident on reading the description and the examples which follow.
The gelled triple water/silicone oil/water emulsion according to the invention is essentially characterized in that it comprises (A) a gelled, continuous, external aqueous phase which comprises at least one fatty-chain gelling agent of the C.sub.3 -C.sub.6 monoethylenic carboxylic acid or
REFERENCES:
patent: 4960764 (1990-10-01), Figueroa, Jr. et al.
patent: 5306498 (1994-04-01), Vesperini et al.
Nadaud Jean F.
Sebillotte Laurence
"L'Oreal"
Sweet Mark D.
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