4,4-diarylbutadienes as water-soluble photostable UV filters for cosmetic and pharmaceutical preparation

A 4,4-diarylbutadiene of the formula I,

• where the diene system has the Z,Z;
• Z,E;
• E,Z or E,E configuration or a mixture thereof, and where the variables independently of one another have the following meanings:
• R1 and R2
• hydrogen, C1-C20-alkyl, C2-C10-alkenyl, C3-C10-cycloalkyl, C3-C10-cycloalkenyl, C1-C12-alkoxy, C1-C20-alkoxycarbonyl, C1-C12-alkylamino, C1-C12-dialkylamino, aryl, hetaryl, unsubstituted or substituted substituents, which confer solubility in water, and are selected from the group consisting of carboxylate, sulfonate or ammonium radicals;
• R3 hydrogen, COOR5, COR5, CONR5R6, CN;
• R4 COOR6, COR6, CONR5R6;
• R5 hydrogen, [X]o-R7, C1-C6-alkylene-SO3Y, C1-C6-alkylene-PO3Y, C1-C6-alkylene-N(R8)3+A−;
• R6 [X]o-R7, C1-C6-alkylene-SO3Y, C1-C6-alkylene-PO3Y, C1-C6-alkylene-N(R8)3+A−;
• X —CH2—CH2-Z-, —CH2—CH2—CH2-Z-, —CH (CH3) —CH2-Z-, —CH2—CH2—CH2—CH2-Z-, —CH2—CH(CH2—CH3)-Z-;
• A Cl, Br, I, SO4R9;
• Y hydrogen, Na+, K+, Mg2+, Ca2+, Li+, Al3+, N(R8)4+;
• Z O, NH;
• R7 and R8
• hydrogen, C1-C6-alkyl, C2-C6-alkenyl, C1-C6-acyl;
• R9 hydrogen, C1-C6-alkyl, C2-C6-alkenyl;
• n 1 to 3;
• o 1 to 150.