Water-reducible nigrosine dye compositions
AssigneeMorton International, Inc.
InventorsPeter A. Caputo, Alejandro Zimin, Sr.
Life of this patent
Estimating the term…
Abstract
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.degree. F. (61.degree. C.) and a boiling point of at least about 280.degree. F. (138.degree. 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 C.sub.1 -C.sub.3 alkanol to form an alcohol solution, mixing the alcohol solution with the solvent B) and non-ionic surfactant C, and subsequently stripping the C.sub.1 -C.sub.3 alkanol.
Claims6
A water-reducible composition consisting essentially of A) between about 20 and about 50 wt % of a water-insoluble nigrosine, B) between about 25 and about 40 wt % of a glycol or pyrrolidone solvent having a flashpoint of at least about 141.degree. F. (61.degree. C.) and a boiling point of at least about 280.degree. F. (138.degree. 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).
A method for preparing a water reducible composition consisting essentially of A) between about 20 and about 50 wt % of a water-insoluble nigrosine, B) between about 25 and about 40 wt % of a glycol or pyrrolidone solvent having a flashpoint of at least about 141.degree. F. (61.degree. C.) and a boiling point of at least about 280.degree. F. (138.degree. 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 method comprising,
- dissolving said nigrosine A) in a C.sub.1 -C.sub.3 alkanol to form an alcohol solution,
- mixing said alcohol solution with said solvent B) and said non-ionic surfactant C), and
- subsequently, stripping said C.sub.1 -C.sub.3 alkanol.
A water-reducible composition consisting essentially of A) between about 20 and about 50 wt % of a water-insoluble nigrosine, B) between about 25 and about 40 wt % of a solvent selected from the group consisting of diethylene glycol, triethylene glycol, tetraethylene glycol, propylene glycol, n-methyl-2-pyrrolidone, and mixtures thereof, 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).
A method for preparing a water reducible composition consisting essentially of A) between about 20 and about 50 wt % of a water-insoluble nigrosine, B) between about 25 and about 40 wt % of an organic solvent selected from the group consisting of diethylene glycol, triethylene glycol, tetraethylene glycol, propylene glycol, n-methyl-2-pyrrolidone, and mixtures thereof, 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 method comprising,
- dissolving said nigrosine A) in a C.sub.1-C.sub.3 alkanol to form an alcohol solution,
- mixing said alcohol solution with said organic solvent B) and said non-ionic surfactant C), and
- subsequently, stripping said C.sub.1 -C.sub.3 alkanol.
Dependencies are inferred from the claim text.