C - Chemistry – Metallurgy – 09 – B
Patent
C - Chemistry, Metallurgy
09
B
260/172, 260/173
C09B 29/00 (2006.01) C09B 29/01 (2006.01) C09B 31/02 (2006.01) C09B 33/02 (2006.01) D21H 21/28 (2006.01)
Patent
CA 1064914
ABSTRACT OF THE DISCLOSURE Water-insoluble azo dyestuffs of the Formula I: Image and water-soluble acid addition salts thereof useful for coloring natural fibers, synthetic fiber-forming material and cellulosic materials as well as in the manufacture of paper, varnishes, inks, coatings and plastics in which A represents an azoic coupling radical derived from a coupling component selected from the group consisting of arylides of hydroxy-substituted carb- cyclic aromatic carboxylic acids, 1-aryl-5-hydroxypyrazoles, 6-amino-1-naphthol-3-sulfonic acid and compounds having an enolizable ketomethylene group of the formula -?-CH?; R is hydro- gen, lower-alkyl, lower-alkoxy or halogen, R2 is hydrogen, lower- alkyl, lower-alkoxy, halogen, aminomethyl or 2-aminoethyl with the proviso that A is other than .beta.-naphthol when R2 is aminomethyl or 2-aminoethyl; R1 and R3 are the same or different and are each hydrogen, lower-alkyl, lower-alkoxy, halogen or aminomethyl with the proviso that at least one of R1 and R3 is aminomethyl when R2 is other than aminomethyl or 2-aminoethyl, and n repre- sents an integer whose value is 1 or 2 and corresponds to the number of azo linkages, which dyestuffs are obtained by coupling a diazotized amine of the Formula VIII (herein).
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