Benzimidazoles
AssigneeCiba-Ceigy Corporation
InventorHans R. Meyer
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Abstract
The novel benzimidazoles have the formula ##STR1## in which A is the radical ##STR2## R.sub.1 is cyanomethyl, 1-cyanoethyl or, if n is the number 1, also 2-cyanoethyl or C.sub.3-6 -carboalkoxymethyl, R.sub.2 is C.sub.1-4 -alkyl or C.sub.3-4 -alkenyl, R.sub.3 is cyanomethyl, cyanoethyl or C.sub.3-6 -carboalkoxymethyl, R.sub.4 and R.sub.5 independently of one another are hydrogen or chlorine, X.sup..crclbar. is a colorless anion of an organic or inorganic acid and n is the number 0 or 1. They are used for the fluorescent brightening of organic materials.
Claims7
A benzimidazole of the formula ##STR41## in which A is the radical ##STR42## R.sub.1 is cyanomethyl, 1-cyanoethyl or 2-cyanoethyl, R.sub.2 is C.sub.1-4 -alkyl, R.sub.3 is cyanomethyl, cyanoethyl or C.sub.3-6 -carboalkoxymethyl, R.sub.4 and R.sub.5 independently of one another are hydrogen or chlorine, X.sup.- is a colorless anion of an organic or inorganic acid and n is the number 0 or 1, provided that when n is 0, R.sub.1 is cyanomethyl or 1-cyanoethyl, and provided that when A is ##STR43## and R.sub.1 is cyanoethyl, R.sub.3 is not cyanomethyl.
Dependencies are inferred from the claim text.