Drug – bio-affecting and body treating compositions – Preparations characterized by special physical form – Cosmetic – antiperspirant – dentifrice
Reexamination Certificate
1998-05-22
2001-12-11
Page, Thurman K. (Department: 1615)
Drug, bio-affecting and body treating compositions
Preparations characterized by special physical form
Cosmetic, antiperspirant, dentifrice
C424S059000, C424S060000, C424S070110, C424S070170, C514S938000, C514S242000, C514S679000
Reexamination Certificate
active
06328981
ABSTRACT:
Applicants reference herein the patent applications of BOUDIAF BOUSSOUIRA and DIDIER CANDAU for COMPOSITION COMPRISING A CINNAMIC ACID DERIVATIVE AND A POLYAMINO POLYMER (Docket No. 05725.0305) and of BOUDIAF BOUSSOUIRA and CHRISTIAN COLIN for COSMETIC USE OF SELECTED POLYAMINO POLYMERS AS ANTIOXIDANTS (Docket No. 05257.0306), filed on even date herewith and incorporate the disclosures thereof specifically by reference herein.
The present invention relates to novel cosmetic and/or dermatological compositions (hereinafter known as anti-sun compositions) intended for protecting the skin and/or hair against UV radiation, in particular solar radiation. More specifically, it relates to novel cosmetic and/or dermatological compositions exerting an improved photostability and comprising, in a cosmetically and/or dermatologically acceptable vehicle, the combination of at least one UV screening agent derived from dibenzoylmethane and at least one polyamino polymer.
The invention also relates to the use of these compositions in the cosmetic and/or dermatological fields.
It is known that light radiation with wavelengths ranging from 280 nm to 400 nm makes it possible for the human skin to brown and that radiation with wavelengths more particularly from 280 to 320 nm, known under the name of UV-B, causes erythemas and skin burns which can harm the development of natural tanning. For these reasons and for aesthetic reasons, there exists a continual demand for means for controlling this natural tanning, for the purpose of thus controlling the colour of the skin; it is thus advisable to screen out this UV-B radiation.
It is also known that UV-A radiation, with wavelengths ranging from 320 to 400 nm, which causes the skin to brown, is capable of leading to a detrimental change in the latter, especially in the case of sensitive skin or skin which is continually exposed to solar radiation. In particular, UV-A radiation causes a loss of skin elasticity and the appearance of wrinkles, leading to premature skin ageing. It promotes the triggering of the erythemal reaction or accentuates this reaction in certain subjects and can even be the cause of phototoxic or photoallergic reactions. Thus, for aesthetic and cosmetic reasons, such as preservation of the natural elasticity of the skin, for example, more and more people wish to control the effect of UV-A radiation on their skin. It is thus desirable to screen out the UV-A radiation as well.
Thus, with the aim of providing protection of the skin and hair against all UV radiation which is as complete and as efficient as possible, use is generally made, in the manufacture of anti-sun compositions, of combinations of screening agents active in the UV-A and of screening agents active in the UV-B.
In this respect, a particularly advantageous family of UV-A screening agents is currently composed of dibenzoylmethane derivatives, in particular 4-tert-butyl-4′-methoxydibenzoylmethane, because these exhibit a strong intrinsic absorption power. These dibenzoylmethane derivatives, which are now products well known per se as screening agents active in the UV-A, are described in particular in French Patent Applications FR-A-2,326,405 and FR-A-2,440,933, and in European Patent Appliiation EP-A-0,114,607, the disclosures of which are specifically incorporated by reference herein.
However, the inventors have found that these dibenzoylmethane derivatives, in particular 4-tert-buty-4′-methoxydibenzoylmethane, when they are exposed to UV irradiation, exhibit the disadvantage of chemically degrading to a significant extent. In particular, the inventors have found that these dibenzoylmethane derivatives underwent peroxidation reactions when they were exposed to UV radiation.
In addition to the problem of the photodegradation of the dibenzoylmethane derivatives themselves, the inventors have found that the dibenzoylmethane, when it is combined with certain other organic screening agents, exhibits the disadvantage of causing the photodegradation of these screening agents when this combination is exposed to UV radiation.
1,3,5-Triazine derivatives, in particular 2,4,6-tris[p-(2′-ethylhexyl-1′-oxycarbonyl)anilino]-1,3,5-triazine, sold under the tradename “UVINUL T 150” by the company BASF, possess a strong absorbing power for UV-B radiation. It would therefore be very advantageous to be able to use them in combination with the 4-tert-butyl-4′-methoxydibenzoylmethane mentioned above with the aim of obtaining products offering broad and effective protection in the whole range of UV radiation.
However, the inventors have found that these 1,3,5-triazine derivatives, when they are brought together with dibenzoylmethane derivatives, in particular 4-tert-butyl-4′-methoxydibenzoylmethane, and placed under UV irradiation, exhibit the disadvantage of chemically degrading to a significant extent. Under these conditions, the combination of the two screening agents no longer allows prolonged broad anti-sun protection of the skin and hair.
Now, following significant research carried out in the field of the photoprotection mentioned above, the inventors have now discovered that:
the combination of certain polyamino polymers, which will be defined hereinbelow, with a dibenzoylmethane derivative, in particular 4-tert-butyl-4′-methoxydibenzoylmethane, made it possible in an entirely remarkable way to improve the photostability of this dibenzoylmethane derivative when it is exposed to UV radiation and thus to improve the overall efficiency of these screening agents;
the combination of certain polyamino polymers, which will be defined hereinbelow, with a dibenzoylmethane derivative and another organic screening agent selected from 1,3,5-triazine derivatives made it possible in an entirely remarkable way to improve the photostability of the 1,3,5-triazine derivatives in the presence of this dibenzoylmethaine derivative when the combination is exposed to UV radiation and thus to improve the overall efficiency of the dibenzoylmethane derivative+1,3,5-triazine derivative screening combination.
A subject-matter of the present invention is thus novel cosmetic anchor dermatological compositions comprising, in a cosmetically and/or dermatologicially acceptable vehicle:
a) at least one polyamino polymer as defined hereinbelow;
b) at least one dibenzoylmethane derivative corresponding to the following formula (V):
in which R
7
, R
8
, R
9
and R
10
independently represent hydrogen or a hydroxyl radical or a linear or branched C
1
-C
8
alkyl radical or a linear or branched C
1
-C
8
alkoxy radical.
Thus, according to the present invention, cosmetic and/or dermatological compositions can be prepared containing a dibenzoylmethane derivative, in particular 4-tert-butyl-4′-methoxydibenzoylmethane, in which compositions the concentration of dibenzoylmethane derivative remains relatively constant even if these compositions are subjected to the action of light.
Another subject-matter of the invention is a cosmetic and/or dermatological composition comprising, in a cosmetically and/or dermatologically acceptable vehicle:
a) at least one polyamino polymer;
b) at least one dibenzoylmethane derivative corresponding to the following formula (V):
in which R
7
, R
8
, R
9
and R
10
independently represent hydrogen or a hydroxyl radical or a linear or branched C
1
-C
8
alkyl radical or a linear or branched C
1
-C
8
alkoxy radical;
c) at least one 1,3,5-triazine derivative corresponding to the following formula (I):
in which:
X
2
and X
3
independently represent oxygen or the—NH— radical;
R
1
, R
2
and R
3
independently are selected from: hydrogen; alkali metals; ammonium radicals optionally substituted by one or more alkyl or hydroxyalkyl radicals; linear and branched C
1
-C
18
alkyl radicals; C
5
-C
12
cycloalkyl radicals optionally substituted by one or more C
1
-C
4
alkyl radicals; polyoxyethylene radicals comprising from 1 to 6 ethylene oxide units, in which the terminal OH group is methylated; radicals of following formula (II), (II
Boussouira Boudiaf
Candau Didier
Channavajjala Lakshmi
Finnegan Henderson Farabow Garrett & Dunner L.L.P.
L'Oreal
Page Thurman K.
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