Asymmetric stilbene compounds useful as sun protection agents

摘要

The present invention provides, as a first aspect, an asymmetric compound having the formula: in which M is hydrogen, an alkali metal atom, ammonium or a cation formed from an amine; Xa and Xb are the same or different and each is NH2; NH(C1-C4alkyl); NH(C2-C4alkoxyalkyl); N(C1-C4alkyl)2; N(CH2CH2OH)2; a group NH-Z-NR1R2 in which Z is C2-C14alkylene or optionally substituted arylene, and R1 and R2 are the same or different and each is C1-C12alkyl or R1 and R2, together with the nitrogen atom to which they are each attached, form a morpholino, piperidino or piperazino ring; an aminoacid residue; C1-C4alkoxy; hydroxy-substituted-C2-C4alkoxy; or and Ya and Yb are the same or different and each is a substituted amino group having both UVA and UVB-absorbing properties having the formula: in which R3 is CN; SO2R5 in which R5 is , C1-C12alkyl, C1-C12alkoxy, NH2, NH(C1-C4alkyl), N(C1-C4alkyl)2,N(CH2CH2OH)2, C1-C4alkoxy or hydroxy-substituted-C2-C4alkoxy; COR5 in which R5 has its previous significance; COOM in which M has its previous significance or NHCOR5 in which R5 has its previous significance and in which R4 has the same significance as R3 or is H, OH, C1-C4alkyl or C1-C4alkoxy and one of Xa and Xb can be identical to one of Ya and Yb, provided that one of Xa and Xb is different from the other and/or one of Ya and Yb is different from the other. The present invention also relates to a method of improving the sun protection factor (SPF) of textile fibre material, especially cotton, polyamide and wool, comprising treating them with the new compounds.