Drug – bio-affecting and body treating compositions – Topical sun or radiation screening – or tanning preparations – Aromatic acid or derivative containing
Patent
1995-04-07
1997-06-03
Dodson, Shelley A.
Drug, bio-affecting and body treating compositions
Topical sun or radiation screening, or tanning preparations
Aromatic acid or derivative containing
424 47, 424 59, A61K 744, A61K 742
Patent
active
056351631
DESCRIPTION:
BRIEF SUMMARY
This application is a Rule 371 continuation of PCT/FR94/00751, filed on Jun. 21, 1994.
The present invention relates to substantive and water-resistant cosmetic compositions which are intended to protect the skin and hair from ultraviolet radiation. It relates more particularly to substantive and water-resistant cosmetic compositions containing a hydrophilic UV screening agent comprising at least one sulphonic acid radical. The invention also relates to their use for the protection of skin and hair against ultraviolet radiation.
It is well known that luminous radiation with wavelengths of between 280 nm and 400 nm allow the human skin to tan, and that rays with wavelengths of between 280 and 320 nm, known by the term UV-B, cause erythemas and skin burns which may damage the development of the tan; this UV-B radiation must therefore be screened.
It is also known that UV-A rays, with wavelengths of between 320 and 400 nm, which cause the skin to tan, are capable of harming the latter, especially in the case of a sensitive skin or a skin which is continually exposed to solar radiation. In particular, UV-A rays cause a loss of skin elasticity and the appearance of wrinkles leading to premature ageing. They promote the triggering of the erythemal reaction or accentuate this reaction in certain subjects and can even be the cause of phototoxic or photoallergic reactions. It is therefore desirable to screen the UV-A radiation as well.
In the context of the present invention, substantivity may be characterized by the hydrophobic nature of the screening combination, that is to say its non-dissociation in waters water resistance may be defined by the stability over time, after showering or bathing, of the protection index in UVA and/or UVB.
Proposals have already been made to improve the substantivity and water-resistance of screening compositions by formulating them either with polymers (see in particular patent U.S. Pat. No. 5,041,281 and patent application JP-A-05 032 532), or in a vehicle comprising a water-in-oil emulsion in the presence of emulsifiers having a HLB (hydrophilic-lipophilic balance) varying from 1 to 7 (see in particular patent U.S. Pat. No. 5,047,232).
These two techniques make it possible effectively to enhance the water resistance of the compositions when they contain lipophilic sunscreen agents. However, it is not the case with the compositions containing hydrophilic sunscreen agents, especially acids, since the latter disappear in water, when bathing in the sea or in a swiping pool, under the shower or when engaging in water sports; thus the anti-sun compositions which contain them, alone or combined with lipophilic sunscreen agents, no longer provide the initial protection desired, when the substrate (skin or hair) to which they have been applied comes into contact with water.
In patent application EP A-0275719, an attempt was made to impart substantivity and water-resistance to anti-sun compositions containing acid screening agents, by combining these agents with a fatty amine.
This type of solution is unsatisfactory in certain cases, because of the impossibility of combining certain acidic screening agents with fatty amines and, also, because fatty amines may cause contact allergies, as is described in the work "Adverse reactions to cosmetics" (Anton de Cornelis de Groot--Ed. Rijksuniversiteit Groningen, 1988) chapter 5, p. 170 et seq.
Now, however, the Applicant has discovered a novel screening cosmetic composition of the type employing a hydrophilic screening agent comprising at least one sulphonic acid group, which overcomes the disadvantages of the prior art and which, moreover, is of enhanced substantivity and water-resistance.
The protection index or PI may be expressed by the ratio of the period of irradiation necessary to reach the erythematogenic threshold with the UV screening agent to the period which is necessary to reach the erythematogenic threshold without a UV screening agent.
The enhancement of these properties is particularly advantageous in the case of anti-sun compositi
REFERENCES:
patent: 3670074 (1972-06-01), Doner
patent: 4585597 (1986-04-01), Lang et al.
patent: 4710584 (1987-12-01), Lang et al.
patent: 4775526 (1988-10-01), Lang et al.
patent: 5004594 (1991-04-01), Richard et al.
Patent Abstracts of Japan, vol. 17, No. 185, (C-1047) 12 Apr. 1993 and JP-A-04 338 317 (KAO CORP) 25 Nov. 1992.
Database WPI, Week 9311, Derwent Publications Ltd., London, GB; AN 93-088577 and JP-A-5 032 532 (SHISEIDO CO LTD) 9 Feb. 1993.
"L'Oreal"
Dodson Shelley A.
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