Drug – bio-affecting and body treating compositions – Topical body preparation containing solid synthetic organic... – Skin cosmetic coating
Reexamination Certificate
1999-09-17
2001-09-11
Dudash, Diana (Department: 1619)
Drug, bio-affecting and body treating compositions
Topical body preparation containing solid synthetic organic...
Skin cosmetic coating
C424S401000, C424S070100, C424S060000, C424S061000, C424S062000, C424S063000, C424S070110, C424S078020, C424S078030, C424S078170, C424S078080, C424SDIG002, C424SDIG003, C424SDIG001, C514S788100, C514S844000, C514S845000, C514S846000, C514S847000, C514S848000, C514S858000, C514S859000, C514S860000, C514S861000, C514S862000, C514S863000, C514S864000, C514S865000, C514S881000, C514S887000, C514S937000, C514S944000, C514S945000, C514S772100, C514S784000, C523S122000, C525S437000, C525S444000, C525S444500, C525S
Reexamination Certificate
active
06287552
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to the use, in cosmetic or dermatological topical compositions, of a dendritic polyester polymer and/or of the combination of the dendritic polymer with a film-forming polymer, and the topical cosmetic or dermatological compositions containing these polymers.
2. Discussion of the Background
In cosmetology and dermatology, it is advantageous to have compositions which are capable of forming films when they are applied to the skin. Compositions having film-forming properties have the advantages of, for example, promoting the evenness of applied layers, reinforcing skin-softening and protecting action, improving the quality of the deposition of make-up products such as foundations and lipsticks, and imparting transfer-resistance (so-called “transfer-free” products), or alternatively, in the case of packs or cataplasms, facilitating cleansing of the skin simply by peeling off the dried composition.
The components imparting the above-noted film-forming properties are generally high-molecular-weight polymers. To obtain substantial film-forming properties in cosmetic or dermatological compositions, it is not satisfactory to simply increase the concentration of these high-molecular-weight polymers in the cosmetic or dermatological compositions. Such an approach is indeed limited by the fact that these polymers excessively increase the viscosity of the finished product. The finished product becomes too thick; it is thus difficult to apply to the skin and therefore loses its sensory qualities.
The present inventors have now discovered that it is possible to overcome the above-noted disadvantages, i.e. to reinforce the film-forming properties of topical cosmetic or dermatological compositions without damaging their sensory properties, by using a new type of polymer called a dendritic polymer or dendrimer having a polyester structure with terminal hydroxyl groups.
Indeed, these dendritic polymers or dendrimers described in greater detail below, although only very slightly viscous, have now been found particularly capable of reinforcing the cohesion of a film formed by customary film-forming polymers. Their incorporation into topical cosmetic or dermatological formulations has no damaging effects on their texture or sensory properties.
SUMMARY OF THE INVENTION
The subject of the present invention therefore relates to a topical cosmetic or dermatological composition, which can be applied to the skin, the keratinous fibres, the nails, the semimucous membranes and/or the mucous membranes, that includes a dendritic polyester polymer having terminal hydroxyl functional groups, or includes the combination of a dendritic polyester polymer having terminal hydroxyl functional groups with a film-forming polymer.
The subject of the present invention also relates to a method of cosmetic treatment using a cosmetic composition that includes a dendritic polyester polymer having terminal hydroxyl functional groups, or includes the combination of a dendritic polyester polymer having terminal hydroxyl functional groups with a film-forming polymer.
The subject of the present invention also relates to the use of a composition including a dendritic polyester polymer having terminal hydroxyl functional groups, or including the combination of a dendritic polyester polymer having terminal hydroxyl functional groups with a film-forming polymer, for the preparation of a dermatological composition intended for the treatment of the skin.
Accordingly, one embodiment of the invention provides a topical cosmetic or dermatological composition, which may be applied to the skin, the keratinous fibres, the nails, the semimucous membranes and/or the mucous membranes, that includes, in a physiologically acceptable medium, a dendritic polyester polymer having terminal hydroxyl functional groups.
Another embodiment of the invention provides a topical cosmetic or dermatological composition, which may be applied to the skin, the keratinous fibres, the nails, the semimucous membranes and/or the mucous membranes, that includes, in a physiologically acceptable medium:
(A) a dendritic polyester polymer having terminal hydroxyl functional groups; and
(B) at least one film-forming polymer.
Another embodiment of the invention provides a method of treatment, that includes applying the above composition to the skin, the nails, the keratinous fibres, the semimucous membranes and/or the mucous membranes.
Another embodiment of the invention provides a method of treatment, that includes spreading the above composition to a part to be treated in a thickness allowing the formation of a film, leaving the composition in contact with the part for a sufficient period to obtain the desired cosmetic or dermatological effect and to allow the partial or complete drying of the composition and removing the film thus formed by peeling off at the end of the period.
DESCRIPTION OF THE PREFERRED EMBODIMENTS
Other features and attendant advantages of the present invention will be more fully appreciated as the same becomes better understood from the following detailed description, which is not intended to be limiting unless otherwise specified.
The compositions according to the invention find a particularly advantageous application in the field of the care of the skin and/or the application of make-up to the skin of the face and of the body, the keratinous fibres, the nails, the mucous membranes and/or the semimucous membranes. Preferably, mucous membrane is understood to mean the internal part of the lower eyelid; semimucous membrane is understood to mean the lips of the face and keratinous fibres are understood to mean in particular the eyelashes, the eyebrows and the hair.
The compositions according to the invention containing the combination of a dendrimer and of a film-forming polymer are in particular very effective when they are used as peelable packs (so-called “Peel Off” packs. These include gels, preferably based on poly(vinyl alcohol), which are spread in a thick layer on the skin of the face or of the body and are removed simply by peeling off the dried film. The film-forming power of the film-forming polymer-dendrimer combination then ensures good cohesion of the film which is removed in a single piece and does not leave small fragments to be subsequently removed.
The dendritic polymers or dendrimers (from the Greek dendron=tree) are “arborescent”, that is to say highly branched, polymer molecules invented by D. A. Tomalia and his team at the beginning of the 1990's (Donald A. Tomalia et al.,
Angewandte Chemie, Int. Engl. Ed
., Vol. 29, No. 2, pages 138-175, the entire contents of which are hereby incorporated by reference). They are molecular structures constructed around a generally polyvalent central unit. Branched units for chain-extension are linked around this central unit, in concentric layers and according to a perfectly defined structure, thus giving rise to monodispersed symmetric macromolecules having a well-defined chemical and stereochemical structure.
The dendritic polymers used in the cosmetic or dermatological compositions of the present invention are dendrimers having the chemical structure of a polyester and which end with hydroxyl groups. The structure and the preparation of these polymers is described in Patent Applications WO-A-93/17060 and WO-96/12754, the entire contents of each of which being hereby incorporated by reference.
More preferably, the dendritic polymers used in the compositions of the present invention may be defined as being highly branched macromolecules of the polyester type, that include:
a central unit derived from an initiator compound carrying one or more hydroxyl functions (a),
chain-extension units derived from a chain-extension molecule carrying a carboxyl function (b) and at least two hydroxyl functions (c), each of the hydroxyl functions (a) of the central molecule being the starting point of a polycondensation reaction (by esterification) which starts with the reaction of the hydroxyl functions (a) of t
Simon Pascal
Tournilhac Florence
Campagne Jean-Michel
Dudash Diana
L'Oreal
Oblon & Spivak, McClelland, Maier & Neustadt P.C.
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