C - Chemistry – Metallurgy – 09 – B
Patent
C - Chemistry, Metallurgy
09
B
8/50
C09B 67/26 (2006.01)
Patent
CA 1274954
ANIONIC DYE DISPERSIONS WITH ENHANCED COLD WATER SOLUBILITY UPON DILUTION ABSTRACT OF THE DISCLOSURE The present disclosure is concerned with enhancing the solubility of dispersed anionic dyes upon the dilution of their dispersions with room temperature water. Concentrated dispersions of such dyes with acceptable stability and low shear viscosities are disclosed which are more readily diluted to dissolve the dispersed dyestuff because they contain certain chelating agents are described. These agents have at least one free or appropriately neutralized acid group, with carboxylic acid groups being preferred. The appropriate cations include ammonium or lithium ions. The free acid groups are subsequently neutralized with these appropriate cations so that the final dispersions are preferably about neutral, i.e have pH values about 7. A further improvement to the dilutability by the addition of a surfactant, preferably a non-ionic surfactant, is also discussed. The preferred disper- sions dilute to a solution free of particles visible to the unaided human eye within three minutes of being combined at a rate of three grams of dispersion per liter of room temperature water.
520626
Sandefur Charles W.
Thomas Thomas J.
Lanxess Corporation
Ogilvy Renault Llp/s.e.n.c.r.l.,s.r.l.
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