Water-reducible nigrosine dye compositions

Details Water-reducible nigrosine dye compositions Water-reducible nigrosine dye compositions

C - Chemistry, Metallurgy

09

B

C09B 17/00 (2006.01) C09B 67/34 (2006.01) C09B 67/40 (2006.01) C09B 67/46 (2006.01)

Patent

CA 2199673

A water-reducible composition comprises A) between about 20 and about 50 wt% of a water-insoluble nigrosine, B) between about 25 and about 40 wt% of a solvent having a flashpoint of at least about 141~F (61~C) and a boiling point of at least about 280~F (138~C.), and C) between about 20 and about 40 wt% of a non-ionic surfactant, the weight percentages being based on total weight of A), B), and C). The composition is prepared by dissolving the nigrosine A) in a C1-C3 alkanol to form an alcohol solution, mixing the alcohol solution with the solvent B) and non-ionic surfactant C, and subsequently stripping the C1-C3 alkanol.

Une composition hydroréductible comprend A) entre environ 20 et environ 50 % en poids d'une nigrosine insoluble dans l'eau, B) entre environ 25 et environ 40 % en poids d'un solvant ayant un point d'éclair d'au moins 141~F environ (61~C) et un point d'ébullition d'au moins 280~F (138~C.) environ, et C) entre environ 20 et environ 40 % en poids d'un surfactant non ionique, les pourcentages en poids étant fondés sur le poids total de A), B) et C). La composition est préparée par dissolution de la nigrosine A) dans un alcanol en C1-C3 pour former une solution d'alcool, par mélange de la solution d'alcool avec le solvant B) et le surfactant non ionique C, suivi de l'élimination de l'alcanol en C1-C3.

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