Drug – bio-affecting and body treating compositions – Topical sun or radiation screening – or tanning preparations
Patent
1997-12-05
1999-09-21
Dodson, Shelley A.
Drug, bio-affecting and body treating compositions
Topical sun or radiation screening, or tanning preparations
424 60, 424400, 424401, A61K 742, A61K 744, A61K 700
Patent
active
059550619
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to novel cosmetic compositions which are more particularly intended for the photoprotection of the skin and/or the hair against ultraviolet radiation (compositions referred to hereinbelow more simply as antisun compositions), as well as to their use in the abovementioned cosmetic application. More precisely, the invention relates to novel cosmetic compositions having an improved sun protection factor and comprising, in a cosmetically acceptable support, at least one dibenzoylmethane derivative, at least one alkyl .beta.,.beta.'-diphenylacrylate and at least one specific benzotriazole silicone.
It is known that light radiation with wavelengths of between 280 nm and 400 nm permits tanning of the human epidermis, and that light rays with wavelengths of between 280 nm and 320 nm, known as UV-B rays, cause skin burns and erythema 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 nm and 400 nm, which cause tanning of the skin, are liable to induce an adverse change in the latter, especially in the case of sensitive skin or of skin which is continually exposed to solar radiation. UV-A rays cause in particular a loss of elasticity of the skin and the appearance of wrinkles, leading to premature skin 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 compounds intended for the photoprotection (UV-A and/or UV-B) of the skin have been proposed to date.
These antisun compositions are quite often in the form of an emulsion of oil-in-water type (that is to say a cosmetically acceptable vehicle consisting of a continuous aqueous dispersing phase and a discontinuous oily dispersed phase) which contains, in various concentrations, one or more conventional lipophilic and/or hydrophilic organic screening agents which are capable of selectively absorbing harmful UV radiation, these screening agents (and their amounts) being selected as a function of the desired sun protection factor (SPF) which is expressed mathematically by the ratio of the irradiation time necessary to reach the erythema-forming threshold with the UV screening agent to the time necessary to reach the erythema-forming threshold without UV screening agent.
After considerable research conducted in the abovementioned field of photoprotection, the Applicant has discovered, surprisingly and unexpectedly, that a combination of three specific families of screening compounds which are already known per se in the prior art makes it possible, on account of a synergy effect, to obtain antisun compositions having markedly improved sun protection factors.
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, characterized in that they comprise, in a cosmetically acceptable vehicle, i) at least one dibenzoylmethane derivative as first screening agent, ii) at least one alkyl .beta.,.beta.'-diphenylacrylate derivative as second screening agent, and iii) at least one benzotriazole silicone corresponding to one of the following formulae: ##STR1## in which formulae (1) and (2):
R, which may be identical or different, are chosen from C.sub.1 -C.sub.10 alkyl, phenyl, 3,3,3-trifluoropropyl and trimethylsi-lyloxy radicals, at least 80%, on a number basis, of the radicals R being methyl,
B, which may be identical or different, are chosen from the radicals P, and the radical A,
r is an integer from 0 to 50 inclusive and s is an integer from 0 to 20 inclusive, and if s=0, at least one of the two symbols B denotes A,
u is an integer from 1 to 6 inclusive and t is an integer from 0 to 10 inclusive, it being understood that t+u is equal to or greater than 3,
and the symbol A denotes a monovalent radical
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patent: 5089250 (1992-02-01), Forestier et al.
patent: 5576354 (1996-11-01), Deflandre et al.
patent: 5587150 (1996-12-01), Deflandre et al.
patent: 5618520 (1997-04-01), Hansenne et al.
"L'Oreal"
Dodson Shelley A.
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