Process for the production of dustfree granules of dyes and optical brighteners
AssigneeCiba-Geigy Corporation
InventorsHelmut Hohenegger, Hanspeter Baumann, Urs Buchel
Life of this patent
Estimating the term…
Abstract
Described is a process for the production of solid dustfree preparations of water-soluble dyes and optical brighteners, which process comprises subjecting the pulverulent dyes or optical brighteners, together with a melt or a solution of ethylene carbonate or propylene carbonate, to a dynamic treatment. The preparations obtained have in particular the advantage that the dust-binding effect is retained undiminished over a long period of time, and that they are completely soluble when used in aqueous baths of dyes or optical brighteners.
Claims10
Process for the production of solid dustfree preparations of water-soluble dyes and optical brighteners, which comprises subjecting the pulverulent dyes or optical brighteners, together with a melt or a solution of ethylene carbonate or propylene carbonate, to a dynamic treatment.
Granules of water-soluble dyes or optical brighteners, which granules contain 30 to 95 percent by weight of dye or of optical brightener, 1 to 25 percent by weight of ethylene carbonate or propylene carbonate, and 1 to 70 percent by weight of additives selected from the group comprising diluting agents, dyeing auxiliaries or mixtures thereof.
Dependencies are inferred from the claim text.