Dainichiseika Color and chemicals patents pigment dispersants.Patent No. U.S. 7,393,404 B2 Dainichiseika Color and Chemicals Manufacturing Company has been granted a patent for a pigment dispersant dis·per·sant n. Chemistry A liquid or gas added to a mixture to promote dispersion or to maintain dispersed particles in suspension. comprised of the following component (a) alone or the following components (a) and (b) in combination. Component (a): a composite pigment formed of a diketopyrrolopyrrole pigment having a sulfonic sul·fon·ic adj. Of or relating to the chemical group SO2OH. group and another diketopyrrolopyrrole pigment having no sulfonic group, wherein the number of sulfonic group per molecule of the diketopyrrolopyrrole pigments in the composite pigment is from 0.05 to 0.5; and component (b): a pigment other than the component (a), wherein the pigment has a sulfonic group or a metal salt, ammonium ammonium /am·mo·ni·um/ (ah-mo´ne-um) the hypothetical radical, NH4, forming salts analogous to those of the alkaline metals. ammonium carbonate salt or amine amine (əmēn`, ăm`ēn): see under amino group. amine Any of a class of nitrogen-containing organic compounds derived, either in principle or in practice, from ammonia (NH3). salt thereof. |
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