To impart an excellent water solubility and a good aging stability as a powder to C.I. Basic Red 46, a cationic azo triazole dye, which, when produced by a conventional process, becomes oily by converting the dye into a powder form by mixing and kneading it with a dye diluent.
A powdery cationic triazole dye is obtd. by quaternizing a compd. represented by the formula, subjecting the resultant product to dilution and salting-out, separating the precipitated oily dye, and kneading it with a dye diluent. The quaternization is performed with dimethyl sulfate or methyl tosylate. The oily dye is completely made powdery by mixing it with 2-5 pts.wt. dye diluent using a mechanical mixer (e.g. a continuous mixer, a continuous kneader, a ribbon mixer, or a blender). A generally used dye diluent (e.g. anhydrous mirabilite, boric acid, or sulfamic acid) is used. An inorg. salt (e.g. sodium chloride, ammonium sulfate, or ammonium chloride) can also be used as the diluent.
MOROOKA KATSUHIRO
SUZUKI NOBUO
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