Drug – bio-affecting and body treating compositions – Preparations characterized by special physical form – Cosmetic – antiperspirant – dentifrice
Reexamination Certificate
2002-05-07
2004-05-18
Padmanabhan, Sreeni (Department: 1617)
Drug, bio-affecting and body treating compositions
Preparations characterized by special physical form
Cosmetic, antiperspirant, dentifrice
C525S094000, C525S299000, C526S072000, C526S073000, C526S303100
Reexamination Certificate
active
06737071
ABSTRACT:
The present invention relates to a composition, in particular a cosmetic or pharmaceutical composition, comprising, in an appropriate medium, at least one polymer with a highly specific ordered structure. These compositions find a specific application in the field of make-up and are capable of being applied to the skin, semi-mucous membranes and/or mucous membranes.
Compositions to be applied to the skin, semi-mucous membranes and/or mucous membranes, such as lipsticks and foundations, are generally provided in the form of a stick, soft paste or cast paste and comprise fatty substances, such as oils, pasty compounds and/or waxes, and a particulate phase generally composed of fillers and pigments.
However, some of these compositions exhibit the disadvantage of transferring. This is understood to mean that the composition is capable of being deposited, at least partly, on certain substrates with which it is brought into contact, such as, for example, a glass, a cup, an item of clothing or the skin. On being deposited, the composition leaves a mark on the substrate. This therefore results in a mediocre persistence of the composition on the skin, semi-mucous membranes or mucous membranes and the need to regularly renew its application.
Furthermore, the appearance of unacceptable marks on some items of clothing and in particular on blouse collars can dissuade some women from using this type of make-up.
Another disadvantage of these compositions lies in the problem of migration. This is because it has been found that some compositions have a tendency to spread inside the fine lines and/or wrinkles of the skin, in the case of foundations; in the fine lines which surround the lips, in the case of lipsticks; and in the folds of the eyelid, in the case of eyeshadows. There has also been observed, in particular in the case of eyeshadows, the appearance of streaks in the make-up, generated by the movements of the eyelids. It has also been found that eyeliners can also run. All these phenomena produce an unsightly effect which it is very clearly desirable to avoid.
For some years, many cosmetic scientists have been interested in “transfer-free” cosmetic compositions, in particular lipstick or foundation compositions. Thus, “transfer-free” liquid lipstick compositions have been envisaged comprising from 1 to 70% by weight of silicone resin with silicate repeat units, from 10 to 98% by weight of a volatile silicone oil and pulverulent fillers. However, the film obtained on the lips after evaporation of the silicone oil exhibits the disadvantage of becoming uncomfortable over time (feeling of dryness and tightness).
“Transfer-free” lipsticks are also known comprising a volatile silicone and a liquid silicone resin comprising a pendant esterified chain having at least 12 carbon atoms. The lipstick film exhibits in particular the disadvantage of lacking comfort on application, in particular of being too dry.
Furthermore, cosmetic make-up compositions comprising film-forming polymers in aqueous solution have been described; however, these compositions are sensitive to water and therefore cannot, in particular, be applied to the lips. When the polymers are dissolved in alcoholic or aqueous/alcoholic media, it has been found that the composition obtained can lead to problems of irritation and/or dehydration of the skin, resulting in a degree of discomfort for the user.
A composition capable of being applied to the skin, semi-mucous membranes and/or mucous membranes is also known, for example from the document EP820,764, comprising, in a polymeric system, an aqueous dispersion of particles of film-forming polymer, the polymeric system making it possible to obtain a film having a Young's modulus of less than approximately 200 MPa.
The aim of the present invention is to provide a composition which does not exhibit the disadvantages of the prior art and which is in particular comfortable to apply and to wear while not being sticky to the touch (absence of tack).
This is because it has been found that compositions intended to be applied to the skin, such as foundations, lipsticks or care compositions, which comprise film-forming polymers generally cannot be simultaneously comfortable to wear and not very sticky to the touch, even after drying. The inventors have for the first time demonstrated that, by using the novel polymers which are the subject-matter of the present invention, it is possible to obtain a cosmetically satisfactory compromise between these two properties, while retaining, in the compositions, the appropriate cosmetic qualities expected by the consumer.
Thus, a subject-matter of the present invention is a polymer with a “star” structure represented by the following formula (I):
A-[(M1)
p1
-(M2)
p2
. . . (Mi)
pj
]
n
in which:
A represents a polyfunctional centre, with a functionality of “n”, n being an integer greater than or equal to 2,
[(M1)
p1
-(M2)
p2
. . . (Mi)
pj
] represents a polymer chain, also known as a “branch”, composed of identical or different polymerized monomers Mi having a polymerization index pj, each branch being identical or different and being grafted covalently to the centre A;
i being greater than or equal to 2 and pj being greater than or equal to 2; the polymer with a star structure comprising:
one or more monomers Mi chosen from polymerized monomers Mk, which may be identical or different, wherein a homopolymer formed by the corresponding polymerized monomers Mk has a Tg of greater than or equal to 0° C., preferably of greater than or equal to 5° C. and even better still of greater than or equal to 20° C.; this or these monomers Mk being present, in the final polymer, in a minimum amount of approximately 40% by weight, preferably in an amount of between 50 and 99% by weight and even better still in an amount of 60-90% by weight with respect to the total weight of monomers; and
the polymer with a star structure furthermore comprising one or more monomers Mi chosen from polymerized monomers Mj, which may be identical or different, wherein a homopolymer formed by the corresponding polymerized monomers Mj has a Tg of less than or equal to 0° C., preferably of less than or equal to −10° C. and even better still of less than or equal to −15° C.; this or these monomers Mj being present, in the final polymer, in a maximum amount of approximately 60% by weight, preferably in an amount of between 1 and 50% by weight and even better still in an amount of 10-40% by weight with respect to the total weight of monomers.
Another subject-matter of the invention is a composition comprising, in a physiologically acceptable medium, at least one polymer as defined above.
Another subject-matter of the invention is a process for the cosmetic treatment of keratinous substances, such as the skin, hair, scalp, eyelashes, eyebrows, nails or lips, characterized in that it comprises applying, to the latter, a cosmetic composition as defined above.
Another subject-matter of the invention is the use of at least one polymer as above in a cosmetic composition or for the preparation of a pharmaceutical composition for decreasing, indeed even eliminating, the transfer of the composition film which has been deposited.
The compositions according to the invention exhibit a light texture and are very comfortable to wear throughout the day.
Furthermore, these compositions make it possible to obtain a film with very good hold, which does not transfer and which does not stain a substrate with which it would be in contact, and which does not migrate over time.
The film is soft, supple, elastic and flexible on the skin; it follows the movements of the substrate on which it is deposited, without cracking and/or detaching. In particular, it adheres perfectly to the lips of the face.
Another advantage contributed by the present invention is that it is possible to obtain a non-sticky and comfortable transfer-free film.
The composition according to the invention can be readily applied and spreads easily, in particular on the lips of the face. The composition according
Finnegan Henderson Farabow Garrett & Dunner L.L.P.
L'Oreal (S.A.)
Padmanabhan Sreeni
Wells Lauren Q.
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