C - Chemistry – Metallurgy – 09 – B
Patent
C - Chemistry, Metallurgy
09
B
8/25.2
C09B 31/02 (2006.01) C09B 33/08 (2006.01) C09B 41/00 (2006.01) C09B 67/26 (2006.01) C09B 69/04 (2006.01) D21H 21/28 (2006.01)
Patent
CA 1073611
ABSTRACT OF THE DISCLOSURE A process for the manufacture of stable, concentrated solutions of water-soluble tertiary ammonium salts of diazo dyestuffs, which comprises: (1) diazotising a mixture selected from the group of (a) 1 mole each of 2-naphthylamine-6-sulphonic acid and 1-amino-2- methoxy-benzene-5-sulphonic acid; (b) 1 mole each of 1-amino-2-methyl- benzene-5-sulphonic acid and aniline; and (c) 1 mole each of naphthionic acid and 1-amino-2-methoxy-benzene-5-sulphonic acid in the presence of sulfuric acid and reacting the diazomixture in the same vessel with 1 mole of 5,5'-dihydroxy-7,7'-disulpho-2,2'-dinaphthyl urea, or (2) diazotising 1 mole each of 1-amino-2-methyl-benzene-5-sulphonic acid and aniline in the presence of sulfuric acid and reacting the diazo mixture in the same vessel with 1 mole of5,5'-dihydroxy-2,2'-dinaphthyl-amino-7,7'-disulphoonic acid in the presence of at least 2 moles of a tertiary amine of the formula Image wherein each R1, R2 and R3 independently represents methyl, ethyl, methoxyethyl or hydroxyethyl, or wherein R2 and R3 together with the nitrogen atom from a pyrrolidine, piperidine, morpholine or thiomorpholine ring. The resulting solutions prove stable even on prolonged storing at room temperature and are not affected by frost. The solutions are miscible in any ratio with water or, in part, also with suitable water-miscible organic solvents.
242281
Hildreth John D.
Potts Herbert A.
Ward Frank
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