Making use of the distributed machine which can add to blend shearing stress the water black pigment ink constituent null which contains the water black pigment dispersing element, and the said dispersing element which are obtained

摘要

PROBLEM TO BE SOLVED: To provide a manufacturing method of an aqueous black pigment-dispersed product, which method improves the fluidity of an object to be processed that contains a pigment, thereby improves productivity and brings forth a more uniformly dispersed condition for the pigment dispersed product to enhance the quality of printing.;SOLUTION: The manufacturing method of the aqueous black pigment dispersion comprises dispersing a carbon black which has an average primary particle size of 15-40 nm and a bulk density of 0.3-0.8 g/ml into an aqueous medium obtained by dissolving an alkali-soluble resin in the presence of an alkali, using a dispersion apparatus which can apply shear stress to the mixture by at least a pair of rotor and stator or by passing it through the gap of at least a pair of rotor and stator.;COPYRIGHT: (C)2006,JPO&NCIPI