| abstract |
There are new 4-heterocyclyvinyl-4'-styryl-biphenyls of the formula described in which A is an unsubstituted or non-chromophorically substituted isoxazolyl, oxadiazolyl, pyrimidinyl or triazinyl radical, R, hydrogen or a non-chromophoric substituent and R 2 is hydrogen, halogen or alkyl, and processes for their preparation.n n n The new 4-heterocyclyvinyl-4'-styryl-biphenyls can be used as optical brighteners for high-molecular organic materials, in particular made of polyamide and polyester, especially for polyester textiles. |