Drug – bio-affecting and body treating compositions – Topical sun or radiation screening – or tanning preparations
Reexamination Certificate
1999-02-26
2001-01-09
Dodson, Shelley A. (Department: 1616)
Drug, bio-affecting and body treating compositions
Topical sun or radiation screening, or tanning preparations
C424S060000, C424S400000, C424S401000, C514S241000
Reexamination Certificate
active
06171579
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Technical Field of the Invention
This application claims priority under 35 U.S.C. §§ 119 and/or 365 to Patent Application No. 98-02416 filed in France on Feb. 27, 1998; the entire content of which is hereby incorporated by reference.
The present invention relates to novel cosmetic and/or dermatological compositions which are intended more particularly for photoprotecting the skin and/or the hair against ultraviolet radiation (these compositions being referred to more simply hereinbelow as antisun compositions), as well as to their use in the abovementioned cosmetic application. Even more specifically, the invention relates to antisun compositions comprising, in a cosmetically acceptable support, a combination between a first specific screening agent, i.e. a specific 1,3,5-triazine derivative, with at least a second specific screen agent suitably selected from benzotriazole silicones, this combination giving the said compositions, by means of a synergistic effect, improved sun protection factors.
2. Description of the Prior Art
It is known that light radiation with wavelengths of between 280 nm and 400 nm permit tanning of the human epidermis and that rays with wavelengths of between 280 and 320 nm, which are known as UV-B, cause erythema and skin burns which may be harmful to the development of a natural tan; this UV-B radiation should thus be screened out.
It is also known that UV-A rays, with wavelengths of between 320 and 400 nm, which cause tanning of the skin, are liable to induce an adverse change therein, in particular in the case of sensitive skin or skin which is continually exposed to solar radiation. UV-A rays in particular cause a loss of skin elasticity and the appearance of wrinkles, leading to premature ageing. They promote triggering of the erythemal reaction or amplify this reaction in certain individuals, and may even be the cause of phototoxic or photoallergic reactions. It is thus desirable also to screen out UV-A radiation.
Many cosmetic compositions intended for photoprotecting the skin (against UV-A and/or UV-B) have been proposed to date.
These antisun compositions are quite often in the form of an emulsion of oil-in-water type (i.e. a cosmetically acceptable support consisting of an aqueous dispersing continuous phase and an oily dispersed discontinuous phase) which contains, in various concentrations, one or more standard, lipophilic and/or hydrophilic organic screening agents capable of selectively absorbing harmful UV radiation, these screening agents (and the amounts thereof) being selected as a function of the desired protection factor (SPF), which is expressed mathematically by the ratio of the irradiation time required to reach the erythema-forming threshold with the UV screening agent to the time required to reach the erythema-forming threshold without a UV screening agent.
SUMMARY OF THE INVENTION
Now, after considerable research conducted in the photoprotection field mentioned above, the applicants have discovered, surprisingly and unexpectedly, that a combination of two specific sun screens which are already known per se in the state of the art gives, on account of a synergy effect, antisun compositions whose sun protection factors are markedly improved, and in any case better than those which can be obtained, for an equal concentration of screening agent and for a support of identical nature, with one or other of the screening agents used alone.
This discovery forms the basis of the present invention.
Thus, in accordance with one of the subjects of the present invention, novel cosmetic compositions, in particular antisun compositions, are now proposed which are essentially characterized in that they comprise, in a cosmetically acceptable support, (i) as first screening agent, a specific 1,3,5-triazine derivative which will be defined in greater detail later, and (ii) as second screening agent, a specific silicon derivative containing a specific benzotriazole function, which will be defined in greater detail later; the said first and second screening agents being present in the said compositions in an amount which is effective for producing synergistic activity in terms of the sun protection factors imparted.
A subject of the present invention is also the use of such compositions as, or for the manufacture of, cosmetic compositions intended for protecting the skin and/or the hair against ultraviolet radiation, in particular solar radiation.
Yet another subject of the present invention is a cosmetic treatment process for protecting the skin and/or the hair against ultraviolet radiation, in particular solar radiation, and which consists essentially in applying an effective amount of a composition in accordance with the invention to the skin and/or the hair.
Other characteristics, aspects and advantages of the present invention will become apparent on reading the detailed description which follows.
DETAILED DESCRIPTION OF BEST MODE AND SPECIFIC/PREFERRED EMBODIMENTS OF THE INVENTION
The 1,3,5-triazine derivatives in accordance with the invention correspond to the following general formula:
in which:
X
1
, X
2
and X
3
, which may be identical or different, represent oxygen or a radical —NR—;
the radicals R, which may be identical or different, denote hydrogen or a linear or branched C
1
-C
18
alkyl radical or a C
5
-C
12
cycloalkyl radical which may be substituted with one or more C
1
-C
4
alkyl radicals;
R
1
, R
2
and R
3
, which may be identical or different, are chosen from: hydrogen; an alkali metal; an ammonium radical optionally substituted with one or more alkyl or hydroxyalkyl radicals; a linear or branched C
1
-C
18
alkyl radical; a C
5
-C
12
cycloalkyl radical optionally substituted with one or more C
1
-C
4
alkyl radicals; a polyoxyethylenated radical comprising from 1 to 6 ethylene oxide units and in which the end OH group is methylated; a radical of formula (II), (III) or (IV) below:
in which:
R
4
is hydrogen or a methyl radical;
R
5
is a C
1
-C
9
alkyl radical;
n is an integer ranging from 0 to 3;
m is an integer ranging from 1 to 10;
A is a C
4
-C
8
alkyl radical or a C
5
-C
8
cycloalkyl radical;
B is chosen from: a linear or branched C
1
-C
8
alkyl radical; a C
5
-C
8
cycloalkyl radical; an aryl radical optionally substituted with one or more C
1
-C
4
alkyl radicals;
R
6
is hydrogen or a methyl radical.
A first preferred family of 1,3,5-triazine derivatives is the one described in particular in document EP-A-0,517,104 (the teachings of which are, as regards the actual definition of these products, entirely included in the present description by way of reference) for the 1,3,5-triazines corresponding to formula (I) above and having all of the following characteristics:
X
1
, X
2
and X
3
are identical and represent oxygen;
R
1
is chosen from: a C
5
-C
12
cycloalkyl radical optionally substituted with one or more C
1
-C
4
alkyl radicals; a radical of formula (II), (III) or (IV) above in which:
B is a C
1
-C
4
alkyl radical;
R
6
is a methyl radical;
R
2
and R
3
, which may be identical or different, are chosen from: hydrogen; an alkali metal; an ammonium radical optionally substituted with one or more alkyl or hydroxyalkyl radicals; a linear or branched C
1
-C
18
alkyl radical; a C
5
-C
12
cycloalkyl radical optionally substituted with one or more C
1
-C
4
alkyl radicals; a radical of formula (II), (III) or (IV) above in which:
B is a C
1
-C
4
alkyl radical;
R
6
is a methyl radical.
A second preferred family of 1,3,5-triazine derivatives according to the invention is the one described in particular in document EP-A-0,570,838 (the teachings of which are, as regards the actual definition of these products, entirely included in the present description by way of reference) for the 1,3,5-triazines corresponding to formula (I) and having all of the following characteristics:
X
1
is oxygen; X
2
is an —NH— radical or oxygen;
X
3
is an —NH— radical;
R
3
is chosen from: a linear or branched C
1
-C
18
alkyl radical; a C
5
-C
12
cycloalkyl radical optionally substituted
Allard Delphine
Gombert Christ{grave over (e)}le
Burns Doane Swecker & Mathis L.L.P.
Dodson Shelley A.
Societe L'Oreal S.A.
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