Drug – bio-affecting and body treating compositions – Topical sun or radiation screening – or tanning preparations
Reexamination Certificate
2000-02-14
2001-04-10
Dodson, Shelley A. (Department: 1616)
Drug, bio-affecting and body treating compositions
Topical sun or radiation screening, or tanning preparations
C424S060000, C424S400000, C424S401000
Reexamination Certificate
active
06214324
ABSTRACT:
CROSS-REFERENCE TO PRIORITY APPLICATION
This application claims priority under 35 U.S.C. §119 of FR-99/01728, filed Feb. 12, 1999, hereby expressly incorporated by reference.
CROSS-REFERENCE TO COMPANION APPLICATIONS
Copending applications Ser. No. 09/503,169, Ser. No. 09/503,943, Ser. No. 08/503,944, Ser. No. 09/503,940, and Ser. No. 09/503,940, each filed concurrently herewith and each assigned to the assignee hereof.
BACKGROUND OF THE INVENTION
1. Technical Field of the Invention
The present invention relates to novel cosmetic compositions for topical application, for the photoprotection of the skin and/or hair against ultraviolet radiation (such compositions hereinafter simply designated “antisun,” “sunscreen” or “photoprotective” compositions) and to the use of same for the cosmetic applications indicated above.
This invention more especially relates to the aforesaid sunscreen/cosmetic compositions comprising, formulated into a cosmetically acceptable vehicle, diluent or carrier thereof, a binary combination of (a) at least one specific benzotriazole compound, as a first screening agent, and (b) as a second screening agent, at least one compound containing at least two benzoazolyl groups and/or at least one compound containing at least one benzodiazolyl group, said first and second screening agents being present in proportions suitable for eliciting a synergistic effect with regard to the sun protection factors conferred.
2. Description of the Prior Art
It is known to this art that light radiation of wavelengths of from 280 nm to 400 nm promotes tanning of the human epidermis and that irradiation with wavelengths of from 280 to 320 nm, i.e., UV-B irradiation, causes erythemas and skin burns which may be harmful to the development of natural tanning; this UV-B radiation must therefore be screened from the skin.
It is also known to this art that UV-A radiation, with wavelengths of from 320 to 400 nm, which causes tanning of the skin, also adversely affects it, in particular in the case of sensitive skin or of skin continually exposed to solar radiation. UV-A rays cause, in particular, a loss in the elasticity of the skin and the appearance of wrinkles, resulting in premature aging. Such irradiation promotes the triggering of the erythemal reaction or accentuates this reaction in certain individuals and can even be the cause of phototoxic or photoallergic reactions. It is therefore desirable to also screen out UV-A radiation.
A wide variety of cosmetic compositions for the photoprotection (UV-A and/or UV-B) of the skin are known to this art.
These photoprotective/sunscreen compositions are typically emulsions of oil-in-water type (namely, a cosmetically acceptable vehicle, diluent or carrier comprising a continuous aqueous dispersing phase and a non-continuous oily dispersed phase) which comprises, at various concentrations, one or more conventional lipophilic and/or hydrophilic organic screening agents capable of selectively absorbing harmful UV radiation, these screening agents (and their amounts) being selected according to the desired protection factor (the protection factor (PF) being expressed mathematically by the ratio of the irradiation time required to attain the erythemogenic threshold with the UV screening agent to the time required to attain the erythemogenic threshold without UV screening agent).
SUMMARY OF THE INVENTION
It has now surprisingly and unexpectedly been determined that the binary combination of two specific sunscreens already per se known to this art provides synergistically active sunscreen/antisun compositions exhibiting markedly improved protection factors, protection factors which are much higher than those which can be obtained either with one or the other of the screening agents used alone.
Briefly, the present invention features novel cosmetic compositions, in particular photoprotective/sunscreen compositions, comprising, in a cosmetically acceptable vehicle, diluent or carrier (a) a specific benzotriazole compound, as a first screening agent, and (b) at least one compound containing at least two benzoazolyl groups and/or at least one compound containing at least one benzodiazolyl group, as a second screening agent, the said first and second screening agents being present in the subject compositions in proportions eliciting a synergistic effect with regard to the sun protection factors conferred.
The present invention also features the use of the subject compositions in the production of cosmetic compositions suited for the photoprotection of the skin and/or hair against the deleterious effects of ultraviolet radiation, in particular solar radiation.
This invention also features cosmetic regime/regimen for the photoprotection of skin and/or hair against the damaging effects of ultraviolet radiation, in particular solar radiation, which essentially entails topically applying onto the skin/hair a photoprotecting effective amount of a composition in accordance herewith.
REFERENCES:
patent: 0 669 232 A1 (1995-08-01), None
patent: 0 843 995 A2 (1998-05-01), None
patent: 0 860 165 A1 (1998-08-01), None
patent: 0 893 119 A1 (1999-01-01), None
Burns Doane Swecker & Mathis L.L.P.
Dodson Shelley A.
Societe L'Oreal S.A.
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