| abstract |
The present invention provides, as a first aspect, an asymmetric compound having thenformula:n nin which M is hydrogen, an alkali metal atom, ammonium or a cation formed from an amine;nXa and Xb are the same or different and each is NH 2 ; NH(C 1 -C 4 alkyl); NH(C 2 -C 4 alkoxyalkyl);nN(C 1 -C 4 alkyl) 2 ; N(CH 2 CH 2 OH) 2 ; a group NH-Z-NR 1 R 2 in which Z is C 2 -C 14 alkylene ornoptionally substituted arylene, and R 1 and R 2 are the same or different and each is C 1 -C 12 alkylnor R 1 and R 2 , together with the nitrogen atom to which they are each attached, formna morpholino, piperidino or piperazino ring; an aminoacid residue; C 1 -C 4 alkoxy; hydroxy-substituted-C 2 -C 4 alkoxy;n norn nand nYa and Yb are the same or different and each is a substituted amino group having both UVAnand UVB-absorbing properties having the formula:n nin which R 3 is CN; SO 2 R 5 in which R 5 is , C 1 -C 12 alkyl, C 1 -C 12 alkoxy, NH 2 , NH(C 1 -C 4 alkyl),nN(C 1 -C 4 alkyl) 2 ,N(CH 2 CH 2 OH) 2 , C 1 -C 4 alkoxy or hydroxy-substituted-C 2 -C 4 alkoxy; COR 5 innwhich R 5 has its previous significance; COOM in which M has its previous significance ornNHCOR 5 in which R 5 has its previous significance and in which R 4 has the same significancenas R 3 or is H, OH, C 1 -C 4 alkyl or C 1 -C 4 alkoxy and one of Xa and Xb can be identical to one ofnYa and Yb, provided that one of Xa and Xb is different from the other and/or one of Ya andnYb is different from the other. n The present invention also relates to a method of improving the sun protection factor (SPF)nof textile fibre material, especially cotton, polyamide and wool, comprising treating them withnthe new compounds. |