abstract |
Monosulfonated 2- (2'-hydroxyphenyl) benzotriazoles of the formula wherein R₁ is hydrogen or chlorine and of R₂ and R₃ one chlorine or lower alkyl and the other a radical of the formula R₄ and R₅ are independently hydrogen or methyl and M is hydrogen, alkali metal or ammonium.n n n The compounds of formula (1) are used as UV absorbers for polyamide fibers, wool and their mixtures. |