Photoprotective cosmetic compositions comprising photostabilized dibenzoylmethane compounds and merocyanine sulfone compounds
AssigneeL'oreal
InventorHerve Richard
Life of this patent
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Abstract
Photostable, topically applicable cosmetic/dermatological compositions contain at least one dibenzoylmethane compound UV-A sunscreen and at least one merocyanine sulfone compound.
Claims26
A topically applicable photostabilized cosmetic/dermatological composition comprising at least one dibenzoylmethane compound UV-A screening agent and at least one merocyanine sulfone compound of formula (1), formulated into a topically applicable, cosmetically/dermatologically acceptable support therefor:
- in which:
- R1 and R2, which may be identical or different, are each H, a C1-C22 alkyl radical, a C3-C8 cycloalkyl radical, a C6-C20 aryl radical, with the proviso that only one of R1, R2 is H and that R1 and R2 may together form, with the nitrogen from which they depend, a cycle containing the —(CH2)m— group, which may be uninterrupted or interrupted by —O— or by —NH—;
- R3 is a carboxyl group, —COOR4, —CONHR4, —COR4, —CONR1R4, —CN or —SO2R4;
- the radicals R4, which may be identical or different, are each a C1-C22 alkyl Radical, a C3-C8 cycloalkyl radical or a C6-C20 aryl radical;
- m is 1-7:
- n is 1-4;
- with the provisos that:
- (i) when n=2, R1, R4 is an alkyl di-radical or R1 and R2 together form with 2 nitrogen atoms, a divalent —(CH2)m— radical;
- (ii) when n=3, R1 and R4 are a trivalent radical;
- (iii) when n=4, R1, R4 are a tetravalent radical;
- and
- (iv) R1 and R2 are not simultaneously a hydrogen atom.
A topically applicable photostabilized cosmetic/dermatological composition comprising at least one dibenzoylmethane compound UV-A screening agent and at least one merocyanine sulfone compound, formulated into a topically applicable, cosmetically/dermatologically acceptable support therefor, in which said at least one merocyanine sulfone compound has one or another of the following formulae (4) and (6):
- in which:
- X is —O—, —NR5—;
- wherein
- R1 and R2 which may be identical or different are each H a C1-C22 alkyl radical, a C3-C8 cycloalkyl radical, a C6-C20 aryl radical, with the proviso that only one of R1, R2 is H and that R1 and R2 may together form, with the nitrogen from which they depend, a cycle containing the —(CH2)m— group, which may be uninterrupted or interrupted by —O— or by —NH—;
- R3is a carboxyl group, —COOR4, —CONHR4, —COR4, —CONR1R4, —CN or —SO2R4;
- the radicals R4, which may be identical or different, are each a C1-C 22 alkyl radical, a C3-C8 cycloalkyl radical or a C6-C 20 aryl radical;
- m is 1-7;
- R5 is a C1-C5 alkyl radical;
- q=0 or 1;
- Y is a divalent C1-C5 alkyl radical, optionally substituted with C1-C4 alkyl radicals and/or containing —O—, —S— atoms or with an —NR1 group;
- the radicals R, which may be identical or different, are each a linear or branched C1-C20 alkyl radical which may optionally be halogenated, a C6-C12 aryl radical or a C1-C10 alkoxy radical;
- a=0 to 3;
- A is a divalent radical selected from the group consisting of methylene, ethylene and a group having one of the following formulae (7), (8) or (9):
- in which:
- Z is a linear or branched, saturated or unsaturated C1-C6 alkylene radical, optionally substituted with a hydroxyl radical or a linear or branched, saturated or unsaturated C1-C8 alkyl radical;
- W is a hydrogen atom;
- a hydroxyl radical or a linear or branched, saturated or unsaturated C1-C8 alkyl radical;
- p is 0 or 1;
- and
- f=1 or 2.
Dependencies are inferred from the claim text.