Patent ID: 6482241
Filing Date: 2002-11-19
Classification: C07D,C11D,D06M

Abstract:
A method for increasing the SPF rating of a textile fibre material, comprising treating the textile fibre material with 0.05 to 3.0% by weight, based on the weight of the textile fibre material, of an asymmetric UV-absorbing compound having the formula in which M is hydrogen, an alkali metal atom, calcium, magnesium, ammonium or a cation formed from an amine; Xa and Xb are the same or different and each is NH2; NH(C1-C4alkyl); N(C1-C4alkyl)2; NH(C2-C4alkoxyalkyl); N(CH2CH2OH)2; a group NHâ€”Zâ€”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; or is an aminoacid residue; C1-C4alkoxy; or hydroxy-substituted-C2-C4alkoxy; Ya and Yb are the same or different and each is a substituted amino group having both UVA and UVB-absorbing properties, and in which 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, whereby Ya and Yb each is a group 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-substituted-C2-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 definition and in which R4 has the same definition as R3 or is H, OH, C1-C4alkyl or C1-C4alkoxy.