Azo dyes having 2,6-diaminopyridine derivatives as coupling components

Claim 1

A dye of the formula ##STR801## wherein: D is phenyl substituted by chlorine, bromine, trifluoromethyl, methyl, methoxy, nitro, cyano, methylsulfonyl, phenylsulfonyl, carbalkoxy of a total of 2 to 5 carbon atoms, carbo-β-alkoxy-ethoxy, said alkoxy having 1 to 4 carbon atoms, or N,N-dialkyl- or N-monoalkyl-substituted sulfamoyl, each alkyl having 1 to 4 carbon atoms; phenylazophenyl; phenylazophenyl substituted by methyl, chlorine, bromine or nitro; benzthiazolyl; benzthiazolyl substituted by nitro, cyano, methylsulfonyl or ethylsulfonyl; benzisothiazolyl substituted by chlorine, bromine, cyano or nitro; thiazolyl substituted by cyano or nitro; thienyl substituted by methyl, cyano, nitro or carbalkoxy of a total of 2 to 5 carbon atoms; or thiadiazolyl substituted by phenyl, methyl, chlorine, bromine, methylmercapto, ethylmercapto or alkoxycarbonylethylmercapto, said alkoxy having 1 to 4 carbon atoms; R is alkyl of 1 to 3 carbon atoms; X is carbamoyl or cyano; R 1 and R 2 may be the same or different with the proviso that one of R 1 and R 2 is C 6 H 5 ; ##STR802## (CH 2 ) 3 OCH 2 CH 2 OH; (CH 2 ) 3 O(CH 2 ) 6 OH; ##STR803## (CH 2 ) 3 OC 2 H 4 OR 7 , (CH 2 ) 3 (OC 2 H 4 ) q OR 8 , (CH 2 ) 3 OR 9 ; ##STR804## C 2 H 4 OC 6 H 5 , C 2 H 4 OC 6 H 4 CH 3 ; ##STR805## and the other of R 1 and R 2 is hydrogen; alkyl of 1 to 8 carbon atoms; alkyl of 2 to 8 carbon atoms substituted by hydroxy, alkoxy of 1 to 8 carbon atoms, formyloxy, acetoxy, propionyloxy, carboxy, cyclohexoxy, benzyloxy, phenylethoxy, phenoxy or pyrrolidonyl; cyclohexyl; methylcyclohexyl; benzyl; phenylethyl; β-phenyl-β-hydroxyethyl; phenyl; tolyl; CH 2 CH 2 OCH 2 CH 2 OH; (CH 2 ) 3 OC 6 H 5 --CH 3 ; (CH 2 ) 3 O(CH 2 ) 4 OH; ##STR806## (CH 2 ) 3 OC 2 H 4 OCH 3 ; (CH 2 ) 3 OC 2 H 4 OC 6 H 5 ; ##STR807## (CH 2 ) 3 OCH 2 CH 2 OH; (CH 2 ) 3 O(CH 2 ) 6 OH; ##STR808## (CH 2 ) 3 OC 2 H 4 OR 7 ; (CH 2 ) 3 (oc 2 H 4 ) q OR 8 ; ##STR809## C 2 H 4 OC 6 H 4 CH 3 ; ##STR810## R 3 is alkyl of one to three carbon atoms, hydroxymethyl or hydroxyethyl; R 4 is hydrogen, alkyl of one to three carbon atoms, hydroxymethyl or hydroxyethyl; R 5 is hydrogen or hydroxyl; R 6 is hydrogen, alkyl of 1 to 4 carbon atoms, methoxy, ethoxy or chloro; one of R 3 to R 5 providing a hydroxy group; R 7 is ethyl, propyl, butyl, cyclohexyl, benzyl, phenylethyl or methylphenyl; R 8 is hydrogen, alkyl of one to four carbon atoms, cyclohexyl, phenyl, methylphenyl, benzyl or phenylethyl; R 9 is cyclohexyl, phenyl, methylphenyl, benzyl or phenylethyl; m is 1 or 2; n is zero, 1 or 2; q is 2, 3 or 4; and p is 1, 2, 3 or 4.