Laked high molecular weight dyes
AssigneeDynapol
InventorsNicolo Bellanca, Thomas E. Furia
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Abstract
Organic pigment lakes are prepared by adsorption of a high molecular weight or polymeric dye onto suitable substratum or extender therefor. The properties of the resultant polymeric lakes approach those of true pigments, and said lakes exhibit maximized dye loading capacities and are exceptionally free of bleed. Thus, the applicability of lake colors is extended in the various food systems and their use is also permitted as industrial pigments.
Claims15
A non-bleeding, high load capacity organic pigment color lake, which lake comprises (1) an acid soluble macromolecular polymeric dye, said dye comprising both an organic chromophoric and an organic non-chromophoric moiety chemically linked together in the ratio of from 0.2 to 1.5 parts by weight of non-chromophoric moiety for each part by weight of chromophoric moiety;
- said dye being absorbed onto (2) a particulate, water insoluble solid opaque inorganic oxide extender therefor having a particle size of from 0.5 to 50 microns, and said lake displaying essentially total lack of bleed and being essentially insoluble at acidic pH.
The organic pigment lake as defined by clain 2, wherein the macromolecular dye has a molecular weight within the range of from about 5,000 to about 1,500,000.
Dependencies are inferred from the claim text.