Verwendung von Cumarinderivaten als optische Aufhellungsmittel für Textilfasern

摘要

The invention comprises compounds of the general formula and quaternization products thereof, where R1 and R2 are hydrogen, alkyl radicals of up to 3 carbon atoms, aralkyl or aryl radicals, R3 and R4 are hydrogen or alkyl radicals of up to 3 carbon atoms. They may be prepared by condensing 4-(1-v-triazolyl)-2-alkoxybenaldehydes with arylacetonitriles and cyclizing after the alkoxy group has been split. Examples are given of the preparation of 7-(1-v-triazolyl)-3-phenyl-coumarin and 7-(1-v-triazolyl)-3-p-tolylcoumarin and their quaternization products with dimethyl and diethyl sulphate.ALSO:Compounds of the general formula where R1 and R2 are hydrogen, alkyl radicals of up to 3 carbon atoms, aralkyl or aryl radicals, R3 and R4 are hydrogen or alkyl radicals of up to 3 carbon atoms, and their quaternization products are useful brightening agents for polyacrylonitrile. In an Example (3), the brightening agent is incorporated in a spinning solution of polyacrylonitrile in dimethyl formamide.ALSO:Compounds of the general formula:- where R1 and R2 are hydrogen, alkyl radicals of up to 3 carbon atoms, aralkyl or aryl radicals, R3 and R4 are hydrogen or alkyl radicals of up to 3 carbon atoms, and their quaternization products, are useful brightening agents for polyester fibres and for polyacrylonitrile fibres. See Examples 1 and 2.