Benzimidazolecarboxanilides of the formula (I) STR1 where R1 and R2 are each H, Cl, alkyl, alkoxy, unsubstitued or alkyl- or alkoxy-substituted phenyl or phenylalkyl, R3 and R4 are each H, uninterrupted or --O-- interrupted alkyl or alkoxy, unsubstituted or alkyl- or alkoxy-substituted phenyl, phenylalkyl, phenoxy, phenylalkoxy hydroxyalkyl, hydroxyalkoxy, alkylcarbonylamino, alkanoyloxy, benzoylamino or benzoyloxy, X is alkylene, n is 1 or 2 and where--if n is 1--R5 is Cl, --OR6 or --NR7 R8 or--if n is 2--R5 is --O--R12 --O-- or --N(R9)--R13 --N(R9)-- where R6 is H, unsubstituted, OH-- or alkanoyloxy-substituted alkyl whose carbon chain may be interrupted by --O-- or --N(R9)--, cycloalkyl, alkenyl, phenylalkyl, phenoxyethyl, hydroxy alkyl, phenylhydroxyalkyl or glycidyl, R7 and R8 are H, alkyl, cycloalkyl, phenyl, naphthyl, alkenyl, phenylalkyl, hydroxyalkyl or --NR7 R8, a saturated 5- or 6- membered heterocycle, R9 is alkyl, cycloalkyl, alkenyl, phenyl, naphthyl or phenylalkyl, R12 is alkylene, alkenylene, cyclohexylene, oxaalkylene and R13 is alkylene, oxaalkylene, diphenylenemethane or dicyclohexylenemethane or --N(R9)--R13 --N(R9)-- is piperazinylene, are excellent light stabilizers for organic materials such as polymers and coating binders.
