| abstract |
Polyester, cotton, polyamide and polyacrylonitrile fabrics and foils of polyvinylchloride are optically brightened by the addition of a compound of the formula ##STR1## in which each of R 1 and R 2 represents a hydrogen atom or an aliphatic, alicyclic, araliphatic, halogen- or alkyl-substituted araliphatic, aromatic, or halogen- or alkyl-substituted aromatic radical, n Or n R 1 and R 2 together with the two carbon atoms of the triazole ring form a five or six membered cycloalkyl ring or such a cycloalkyl ring having condensed on it a benzene ring, n R 3 represents a hydrogen or halogen atom or a low molecular weight alkyl or alkoxy radical. |