Sulphonated 2,5-distilbenyl-1,3,4-oxdiazoles - optical brighteners for natural or synthetic polymers

摘要

Distilbenzyl oxidazoles for formula (I): (R1=H, 1-4C alkyl or alkoxy, Cl, SO3H, sulphenyl, CN, COOH or 2-6C carbalkoxy, R2=H, 1-4C alkyl or alkoxy, or Cl; R3=H or 1-4C alkyl; M=H, alkali or alkaline earth metal, NH4 or amine cation). are prepd be. g. by reacting 2,5-di(4-formylphenyl)oxidazole with a sulphobenzylphosphonate or analogue. (I) tare optical brighteners for natural, artificial or synthetic high mol. wt. org. material esp. cellulose or polyamides. They can be applied by padding, incorporation into monomers, spin melts or solns. etc. and may also be used for shading with dyes or pigments, in domestic detergent compsns. or as scintillators for e.g. electrography. (I) are compatible with active chlorine cpds. are nonionic surfactants.