Drug – bio-affecting and body treating compositions – Topical sun or radiation screening – or tanning preparations
Patent
1999-01-28
2000-02-15
Dodson, Shelley A.
Drug, bio-affecting and body treating compositions
Topical sun or radiation screening, or tanning preparations
424 60, 424 7802, 424 7803, 424400, 424401, 514937, 514938, 514943, A61K 742, A61K 744, A61K 700, A61K 3174
Patent
active
060249447
DESCRIPTION:
BRIEF SUMMARY
The invention relates to an antisun composition of emulsion type containing a solid elastomeric organopolysiloxane, having a high degree of protection against solar radiation. The invention also relates to a process for protecting the skin and/or the lips against solar radiation, which consists in applying this composition to the skin and/or the lips.
With the ever-increasing knowledge of the damage caused by solar rays (either natural or artificial) on the skin and the excessive behaviour of human beings who always desire to have a "good complexion", cosmeticians are seeking to manufacture antisun compositions of increasingly high performance, as regards the antisun protection and the remanence or resistance to water of these compositions. This remanence in particular allows human beings to bathe after they have been covered with antisun product, while at the same time being effectively protected against solar rays.
In order to obtain a composition with a high degree of protection, generally represented by the SPF (sun protection factor), emulsions are especially used, in particular oil-in-water emulsions, containing one or more hydrophilic or water-soluble screening agents combined with [lacuna] or more specific lipophilic or liposoluble screening agents in the name of the Applicant. According to this technique, the improvements in the SPF obtained are based on the synergistic combination of specific hydrophilic and lipophilic screening agents (such as benzene-1,4-di (3-methylidene-10-camphorsulphonic acid) and 2-ethylhexyl .alpha.-cyano-.beta., .beta.-diphenylacrylate (which is the case of Application EP-A-0,685,228)) in standard oil-in-water emulsions, such that these improvements cannot be obtained generally, i.e. irrespective of the hydrophilic and lipophilic screening agents used.
Lipophilic screening agents have the advantage of giving the composition good properties of remanence to water. Thus, the higher the concentration of lipophilic screening agents, the greater the properties of remanence to water and screening power. However, the use of these lipophilic screening agents at high concentration has the drawback of giving the composition a greasy and shiny appearance, which is often considered as a drawback, in particular by individuals with greasy skin.
Thus, the need remains for an antisun composition comprising both hydrophilic screening agents and lipophilic screening agents and whose SPF is high and stable over time, irrespective of the hydrophilic and/or lipophilic screening agents used, while at the same time having a non-greasy appearance.
The composition of the invention applies both to the skin and to the lips. It can be in the form of a care or treatment cream, as well as in the form of a make-up product.
More precisely, the subject of the invention is an antisun composition comprising an aqueous phase containing at least one water-soluble screening agent, a fatty phase containing at least one liposoluble screening agent and at least one partially crosslinked, elastomeric, solid organopolysiloxane which serves as gelling agent.
The term "elastomeric" is understood to refer to a flexible, deformable material which has viscoelastic properties and in particular has the consistency of a sponge or of a flexible sphere.
The elastomeric organopolysiloxanes of the composition according to the invention have remarkable oil-gelling power. They do not dry out the skin and they provide good cosmetic properties. These novel elastomers lead to compositions which are comfortable when applied and feel soft, non-greasy and non-sticky. This softness is due in particular to the texture of organopolysiloxanes.
The composition of the invention can be in the form of a paste or a cream. It can be an oil-in-water or water-in-oil emulsion.
The elastomeric organopolysiloxanes of the composition according to the invention are generally partially or totally crosslinked and of three-dimensional structure. When included in a fatty phase, they become converted, depending on the content of fatty phase used, from a p
REFERENCES:
patent: 5266321 (1993-11-01), Shukuzaki et al.
Chemical Abstracts, vol. 126, No. 8, Feb. 24, 1997, Columbus, Ohio, Abstract No. 108664, Kuroda, Akihiro et al, "Sunscreens containing metal oxides, polyoxyalkylene-polysiloxanes, and elastomers or resin waxes" XP002047963.
Chemical Abstracts, vol. 126, No. 3, Jan. 20, 1997, Columbus, Ohio, Abstract No. 36869, Aizawa, Masanori et al, "Cosmetics containing organopolysiloxane elastomers and UV absorbents for prevention of sunburn" XP002047964.
Dodson Shelley A.
Societe l'Oreal S.A.
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