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Title: Process for the production of readily dispersible preparations of dyes and polyvinylacetals
Abstract:
There is described a process for producing readily dispersible, nondusty dye preparations in granulated form, in which process difficultly water-soluble to water-insoluble dyes, pigments or optical brighteners, in a finely dispersed form, and water-insoluble carrier resins from the polyvinylacetal class are added with vigorous shaking or stirring, to a two-phase system composed of water and a polar organic solvent having only limited solubility in the aqueous phase; the organic phase containing the dye and the carrier resin is dissipated by dilution with water; and the particles of the preparation are separated and freed from the aqueous, solvent-containing phase by rinsing and drying; the preparations which contain transferable dyes are especially useful for preparing a printing ink by dispersion in a liquid medium composed of water or of an organic solvent or of a mixture of water and an organic solvent; the printing inks thus obtained are themselves useful for printing paper which can be used in a transfer printing process.
Other info: Inventors: Wegmann, Jacques E. (Bettingen, CH) Application Number: 730967 Filing Date: 1976-10-08 Publication_date: 1978-12-19 Assignee: Ciba-Geigy AG (CH) Primary Class(es): 523/332 8/467, 524/557 Other Classes: US Patent Ref:
Other Refs:
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