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
06214323
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Technical Field of the Invention
The present invention relates to novel cosmetic compositions for topical application, for photoprotecting the skin and/or the 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 therefor, a tripartite combination of (a) benzene-1,4-bis(3-methylidene-10-camphorsulfonic acid), optionally in partially or totally neutralized form, as a first screening agent, (b) at least one bisresorcinyltriazine compound as a second screening agent, and (c) as a third screening agent, at least one compound containing at least two benzazolyl groups or a compound containing at least one benzodiazolyl group, the said first, second and third screening agents being present in the subject compositions in proportions suitable for eliciting a synergistic effect with regard to the protection factors imparted.
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 radiation, causes skin burns and erythema which may be harmful to the development of a natural tan; this UV-B radiation should thus 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 which is continually exposed to solar radiation. UV-A rays in particular cause a loss of skin elasticity and the appearance of wrinkles, resulting in premature aging. Such irradiation promotes triggering of the erythemal reaction or amplifies this reaction in certain individuals and may even be the cause of phototoxic or photoallergic reactions. It is thus desirable to also screen out UV-A radiation.
A wide variety of cosmetic compositions for photoprotecting (against UV-A and/or UV-B) the skin are known to this art.
These photoprotective/sunscreen compositions are typically emulsions of oil-in-water type (i.e., a cosmetically acceptable support (vehicle, diluent or carrier) comprising an aqueous dispersing continuous phase and an oily dispersed discontinuous phase) which contains, in various concentrations, one or more conventional 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 (the protection factor (PF) being expressed mathematically by the ratio of the irradiation time required to attain the erythema-forming threshold with the UV screening agent to the time required to attain the erythema-forming threshold without a UV screening agent).
SUMMARY OF THE INVENTION
It has now surprisingly and unexpectedly been determined that a tripartite combination of three specific sunscreens already per se known to this art provides synergistically active sunscreen compositions exhibiting markedly improved protection factors.
Briefly, the present invention features novel cosmetic compositions, in particular photoprotective/sunscreen compositions, comprising, in a cosmetically acceptable vehicle, diluent or carrier, (a) benzene-1,4-bis(3-methylidene-10-camphorsulfonic acid), optionally in partially or totally neutralized form, as a first screening agent, (b) at least one bisresorcinyltriazine compound as a second screening agent, and (c) as a third screening agent, at least one compound containing at least two benzoazolyl groups or a compound containing at least one benzodiazolyl group, the said first, second and third screening agents being formulated into the subject compositions in proportions which elicit a synergistic effect with regard to the protection factors imparted.
The present invention also features the use of the subject compositions for the production of cosmetic compositions suited for photoprotecting the skin and/or the hair against the deleterious effects of ultraviolet radiation, in particular solar radiation.
This invention thus also features a cosmetic regime/regimen for photoprotecting the skin and/or the hair against the damaging effect of ultraviolet radiation, in particular solar radiation, which essentially entails topically applying onto the skin/hair an effective photoprotecting amount of a composition in accordance herewith.
DETAILED DESCRIPTION OF BEST MODE AND SPECIFIC/PREFERRED EMBODIMENTS OF THE INVENTION
More particularly according to the present invention, novel cosmetic or dermatological compositions, in particular sunscreen/antisun compositions, are now provided, comprising, formulated into vehicle, diluent or carrier therefor:
(a) benzene-1,4-bis(3-methylidene-10-camphorsulfonic acid), optionally in partially or totally neutralized form, as a first screening agent;
(b) as a second screening agent, at least one bisresorcinyltriazine compound;
(c) as a third screening agent, at least one compound containing at least two benzoazolyl groups per molecule and/or at least one compound containing, per molecule, at least one benzodiazolyl group, the said first, second and third screening agents being formulated into the subject compositions in proportions which elicit a synergistic effect with regard to the sun protection factors imparted.
By the expression “containing at least two benzazolyl groups” are intended, per molecule, at least two groups of the benzoxazolyl, benzothiazolyl or benzimidazolyl type.
By the expression “containing at least one benzodiazolyl group” is intended, per molecule, one group of the benzodioxazolyl, benzodithiazolyl or benzodiimidazolyl type.
Benzene-1,4-bis(3-methylidene-10-camphorsulfonic acid) and the various salts thereof, described, in particular, in FR-A-2,528,420 and FR-A-2,639,347, are screening agents that are already known per se (so-called broad-band screening agents) which are capable of absorbing ultraviolet radiation with wavelengths of from 280 to 400 nm, with absorption maxima of from 320 to 400 nm, in particular at about 345 nm.
These screening agents have the structural formula (I) below:
in which A is a hydrogen atom, an alkali metal or a radical NH(R)
3
+
in which the radicals R, which may be identical or different, are each a hydrogen atom, a C
1
-C
4
alkyl or hydroxyalkyl radical, or a group M
n+
, wherein M
+
is a multivalent metal cation in which n is equal to 2, 3 or 4, M
+
preferably being a metal cation selected from among Ca
2+
, Zn
2+
, Mg
2+
, Ba
2+
, Al
3+
and Zr
4+
. It will be appreciated that the compounds of formula (I) above also comprehend the “cis-trans” isomer about one or more double bond(s) and that all such isomers are within the scope of the present invention.
The benzene-1,4-bis(3-methylidene-10-camphorsulfonic acid), and/or one of the various salts thereof, is advantageously present in the screening compositions according to the invention in a total concentration ranging from 0.1% to 15% by weight, approximately, and preferably from 0.2% to 10% by weight, approximately, relative to the total weight of the composition.
The bisresorcinyltriazine compounds according to the present invention are preferably selected from among those having the structural formula (II) below:
in which (i) the radicals R
1
and R
2
, which may be identical or different, are each a C
3
-C
18
alkyl radical, a C
2
-C
18
alkenyl radical, or a residue of formula —CH
2
—CH(OH)—CH
2
—OT
1
in which T
1
is a hydrogen atom or a C
1
-C
8
alkyl radical; or (ii) the radicals R
1
and R
2
, which again may be identical or different, are also each a residue of formula (1) below:
in which m
1
is a number ranging from 1 to 3; R
3
is a hydroxyl gr
Burns Doane Swecker & Mathis L.L.P.
Dodson Shelley A.
Societe L'Oreal S.A.
LandOfFree
Photoprotective/cosmetic compositions comprising... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Photoprotective/cosmetic compositions comprising..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Photoprotective/cosmetic compositions comprising... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2499524