| 摘要 |
The use of a dimer derivative of alpha -alkyl styrene as photo-stabilizer of solar filters in preparation of cosmetic or dermatological compositions containing at least one derivative of dibenzoylmethane, to improve its stability against the action of UV irradiation. Process of improving stability of at least one derivative of dibenzoyl methane against UV irradiation comprises association of this derivative with a dimer derivative of alpha -alkylstyrene of formula (I). R<1> and R<2> = H, OH, NH2, 1-12C alkyl, alkoxy, monoalkylamino or dialkylamino radical, or solubilizing substituent selected from carboxylate, sulfonate or ammonium group; R<3> and R<4> = COOR<6>, COR<6>, CONR<6> or CN; R<5> = 1-12C alkyl radical; R<6> and R<7> = H, 1-12C alkyl, 2-10C alkenyl, 3-10C cycloalkyl or cycloalkenyl (optionally carrying one or more O, N or S heteroatoms, 6-18C aryl, 4-7C heteroaryl, all able to carry one or more substituents selected from halogens, cyano, nitro, or amino groups, 1-4C mono- or di- alkylamino, alkyl or alkoxy radical, or OH group); A = O, S or NR<8> group; R<8> = H or 1-12C alkyl, with at least two of R<8>, R<1> and R<2> able to form together 5-6 links cycle with the benzene nucleus to which they are linked; B = 1-12C alkylene radical optionally carrying one or more substituents selected from OH, O -(1-6C) acyl, NH2, NH (1-6C)-alkyl or acyl, CN, COOH, COO (1-6C)-acyl, 4-12C cycloalkylene, 8-22C aralkylene, 9-21C mono-oxo-aralkylene, or (X)n-Y- group; X = -CH2-CH2-Z-, -CH2CH2CH2-Z-, -CH(CH3)-CH2-Z-, -CH2CH2CH2CH2-Z- or -CH2-CH(CH2CH3)-Z-; Y = -CH2-CH2-, -CH2CH2CH2-, -CH(CH3)-CH2-, -CH2-CH2-CH2-CH2- or -CH2-CH(CH2CH3)-; Z = O or S; and n = 1-150. An Independent claim is also included for use of a dimer derivative of alpha -alkylstyrene of formula (I) in preparation of cosmetic or dermatological compositions containing at least one derivative of dibenzoylmethane, to improve its stability against the action of UV irradiation.
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