Production of azoic pigments

Claim 1

IN THE PROCESS FOR PRODUCING PIGMENTS OF THE AZO CLASS WHEREIN A FRESHLY PREPARED UNSTABILIZED DIAZOTIZED PRIMARY AROMATIC AMINE COMPOUND DEVOID OF WATER-SOLUCOMPONENT DEVOID OF WATER-SOLUBILIZING GROUPS AND SELECTED FROM THE GROUP CONSISTING OF ACYLACETARYLIDES, PYRAZOLONES, AND AROMATIC HYDROXY COMPOUNDS CAPABLE OF COUPLING, THE IMPROVEMENT WHICH COMPRISES EFFECTING THE COUPLING BY ADMIXING AN AQUEOUS BATH CONTAINING SAID FRESHLY PREPARED UNSTABILIZED DIAZOTIZED COMPOUND WITH AQUEOUS BATH CONTAINING SAID COUPLING COMPONENT AND A WATER-SOLUBLE ANIONIC SURFACE ACTIVE AGENT SELECTED FROM THE GROUP CONSISTING OF ORGANIC SULFATES AND SULFONATES OF AT LEAST 9 CARBON ATOMS, AND THEN HEATING THE RESULTING AQUEOUS BATH AT A TEMPERATURE OF ABOUT 90 TO 103* C. UNTIL THE AZOIC PIGMENT IS PRODUCED IN A READILY FILTERABLE FLOCCULANT FORM, SAID SURFACE ACTIVE AGENT BEING EMPLOYED IN AN AMOUNT RANGING FROM ABOUT 25 TO 175 G. PER GRAM MOLE OF AZOIC PIGMENT.