Dustless, water-soluble, solid, dyestuff or optical brightener compositions and a process of production
AssigneeCiba-Geigy Corporation
InventorsWalter Gunther, Kurt Hintermayr
Life of this patent
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Abstract
Described is a process for the production of substantially dustless water-soluble dye or optical brightener compositions, which process comprises mixing a dry, solid inorganic salt, heated to at least 50.degree. C., with a mixture of at least one dye or optical brightener, an adhesive as e.g. sorbitol, a dust binding surface active agent and further additives. Such compositions are negligibly dusty to dustfree, and retain these properties even after storage for months, particularly in the case where spray-dried material is used.
Claims21
A process for the production of a substantially dustless water-soluble dye or optical brightener composition, which process comprises mixing a dry, solid, alkali metal salt of an inorganic acid, heated to at least 50.degree. C., with a mixture of at least one dry water-soluble dye or optical brightener, an organic adhesive having a softening or melting point in the range of 30.degree. to 150.degree. C. and selected from the group consisting of sorbitol, urea, hydrated dextrose, glucose, lactose, mannitol, mannose, and polyethylene glycol having a molecular weight of above 3000, a dust-binding agent which is a surface-active agent, and one or more further additives selected from the group consisting of a water-soluble organic polyhydroxy compound having a melting point above 100.degree. C., a dispersing agent, and a solid acid, base or buffer for pH adjustment.
Dependencies are inferred from the claim text.