Drug – bio-affecting and body treating compositions – Preparations characterized by special physical form – Cosmetic – antiperspirant – dentifrice
Reexamination Certificate
1999-06-24
2003-04-01
Dodson, Shelley A. (Department: 1616)
Drug, bio-affecting and body treating compositions
Preparations characterized by special physical form
Cosmetic, antiperspirant, dentifrice
C424S063000, C424S064000, C424S065000, C424S070100, C424S070120, C424S400000
Reexamination Certificate
active
06541017
ABSTRACT:
The subject-matter of the present invention is anhydrous cosmetic compositions for cosmetic or pharmaceutical use.
Make-up compositions comprising a fatty phase are commonly used in cosmetics because of their good adhesion to the epidermis, their feeling of comfort, their protective capability and their ability to form a water-impermeable film. Anhydrous make-up products are generally provided in the form of a compact solid or else in the form of a cream. They can also be provided in the form of a fluid gel.
These compositions can constitute products for caring for the skin, including the scalp, and/or products for making up the skin, mucous membranes (lips or interior of the eyelids), semimucous membranes (lips) or keratinous fibres (hair, eyelashes, nails), or products for making up the body.
However, those skilled in the art still seek to improve the stability of products of this type.
Furthermore, these compositions, when they are applied to the skin, mucous membranes or semimucous membranes, can 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, an item of clothing or the skin.
On being deposited, the said composition leaves a mark on the said substrate. The result of this is therefore a mediocre persistence of the composition on the skin or mucous membranes, resulting in the need to regularly renew its application.
Furthermore, the appearance of unacceptable marks on certain items of clothing and in particular on blouse collars can dissuade some people from using this type of make-up.
Another disadvantage of these compositions can reside in the problem of migration. This is because it has been found that some compositions had a tendency to spread inside the fine lines and/or wrinkles of the skin, in the case of foundations; into the fine lines which surround the lips, in the case of lipsticks; or into the folds of the eyelid, in the case of eyeshadows. In the case in particular of eyeshadows, the appearance of streaks in the make-up, generated by the movements of the eyelids, has also been found.
All these phenomena produce an unsightly effect which it is very clearly desirable to avoid.
With the aim of lessening these phenomena, provision has been made in WO 97/16157 to combine, with a volatile solvent, a polymeric emulsifier of organosiloxane type having at least one hydrophilic radical and at least one lipophilic radical.
However, if it is desired to introduce pigments into these products, a problem of homogeneity of the pigments can be encountered.
In all cases, the compositions of the prior art could be improved regarding both stability and homogeneity of the dispersion of the pigments.
The aim of the present invention is to provide an anhydrous composition which can exhibit good stability, little transfer and very good dispersion of the pigments and thus improved cosmetic properties.
It has now been discovered, unexpectedly and surprisingly, that, with the use of a specific surfactant, it was possible to obtain anhydrous compositions having not only good stability over time but also with respect to temperature variations and furthermore exhibiting excellent cosmetic properties, in particular a homogeneous dispersion of the pigments.
The subject-matter of the present invention is therefore an anhydrous composition, in particular for cosmetic, dermatological, hygienic or pharmaceutical use, comprising at least one silicone oil and at least one pigment, characterized in that it comprises at least one oxyalkylenated silicone substituted at the &agr; and &ohgr; positions.
The invention also relates to a process for the non-therapeutic treatment of the skin and/or of the scalp, in particular a make-up process, which comprises applying, to the skin or mucous membranes and/or to the scalp, a composition as defined above.
The anhydrous composition according to the invention is preferably particularly stable.
The anhydrous composition according to the invention is preferably particularly homogeneous, making possible a uniform and homogeneous make-up.
Preferably, the anhydrous composition according to the invention additionally exhibits good resistance to transfer. Furthermore, when applied to the skin, it can exhibit the advantage of not migrating into the folds of the skin and/or the wrinkles of the face.
It has been found that the composition used according to the invention can be applied and spread easily in a homogeneous way without leaving a feeling of greasiness and can exhibit good cosmetic properties. The film obtained can also exhibit a light texture and remain comfortable to wear throughout the day.
Furthermore, the composition according to the invention can have good sensory qualities, in particular great ease of application, comfort, softness, good mattness and good covering power, uniformity and hold.
The compositions of the invention are anhydrous compositions. The term “anhydrous composition” is understood to mean a composition comprising less than 5% by weight of water with respect to the total weight of the composition, preferably from 1% to 2% of water, more preferably less than 1% of water. Most preferably still, the composition does not comprise water at all. The compositions of the invention are preferably devoid of polyvalent alcohols, that is to say of alcohols comprising at least two OH groups, such as propylene glycol, butylene glycol, glycerol or sorbitol.
In this application, silicone is understood to denote, in accordance with what is generally accepted, all organosilicon polymers or oligomers
with linear or cyclic, branched or crosslinked structure,
of variable molecular weight,
obtained by polymerization and/or polycondensation of suitably functionalized silanes and
essentially composed of a repetition of main units in which the silicon atoms are connected to one another via oxygen atoms (siloxane bond ≡Si—O—Si≡), optionally substituted hydrocarbon-comprising radicals being directly bonded via a carbon atom to the said silicon atoms. The most common optionally substituted hydrocarbon-comprising radicals are alkyl radicals, in particular C
1
-C
10
alkyl radicals and especially methyl radicals, fluoroalkyl radicals or aryl radicals, in particular the phenyl radical.
Thus, the oxyalkylenated silicone substituted at the &agr; and &ohgr; positions which can be used for the composition according to the invention is an organosilicon polymer as defined above, with a linear structure, substituted at the two ends of the main chain by oxyalkylene groups connected to the Si atoms via a hydrocarbon-comprising group. Preferably, the main chain does not comprise a pendant oxyalkylene group.
The oxyalkylenated silicone substituted at the &agr; and &ohgr; positions preferably corresponds to the following general formula (I):
in which:
R=—(CH
2
)
p
—O—(C
2
H
4
O)
x
(C
3
H
6
O)
y
R
1
where:
R
1
represents H, CH
3
or CH
2
CH
3
,
p is an integer ranging from 1 to 5, x varies from 1 to 100 and y varies from 0 to 50,
it being possible for the (C
2
H
4
O) and (C
3
H
6
O) units to be randomly distributed or to be distributed by blocks,
the R
2
radicals represent a C
1
-C
3
alkyl radical or a phenyl radical,
5≦m≦300.
The oxyalkylenated silicone substituted at the &agr; and &ohgr; positions used according to the present invention preferably corresponds to the general formula (I) in which all the R
2
radicals are methyl radicals and:
p ranges from 2 to 4,
x ranges from 3 to 100,
m ranges from 50 to 200.
More preferably, the average molecular weight of R ranges from 800 to 2600.
The ratio by weight of the C
2
H
4
O units with respect to the C
3
H
6
O units preferably ranges from 100:10 to 20:80.
This ratio is preferably approximately 42/58.
More preferably, R
1
is the methyl group.
In an even more preferable way, the composition according to the invention comprises the oxyalkylenated silicone substituted at the &agr; and &ohgr; positions of following formula:
in w
Bara Isabelle
Collette Annick
Lemann Patricia
Dodson Shelley A.
Finnegan Henderson Farabow Garrett & Dunner L.L.P.
L'Oreal (S.A.)
Lamm Marina
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