Stable, concentrated, liquid dispersions of anionic dyestuffs
AssigneeCiba-Geigy Corporation
InventorThomas M. Mangum
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Abstract
A composition and a process for the production of stable, water dispersions of anionic dyestuffs, for example acid or direct dyestuffs, useful for the dyeing of organic fibers including paper. Highly concentrated, liquid dispersions of at least 15-40% by weight of dry anionic dyestuff are achieved by the use of nonionic dispersing agents and mixing or grinding in a mill until most of the undissolved dyestuff particles are smaller than 10.mu..
Claims6
A stable dyestuff composition which is a water solution of an anionic dye, containing a nonionic dispersing agent, and having dispersed therein undissolved particles of the dye which are 10.mu. or less in diameter, wherein the composition consists essentially of about 40% to about 80% by weight of water, about 15% to about 40% by weight of the dye and about 1% to about 25% by weight of the dispersing agent.
Dependencies are inferred from the claim text.