Water-resistant aluminum pigment, water-resistant aluminum pigment dispersion, aqueous ink composition containing the aforementioned, and method for producing water-resistant aluminum pigment dispersion

摘要

A method for producing a water-resistant aluminum pigment dispersion includes (a) adding a treatment agent containing a compound of general formula (1) described below to an aluminum pigment dispersion containing aluminum pigment particles dispersed in an organic solvent and reacting a hydroxy group present on a surface of each of the aluminum pigment particles with the compound of general formula (1) described below to form a film on the surface of each aluminum pigment particle, (b) removing at least a portion of the organic solvent, and (c) adding an aqueous solution containing at least one selected from polyoxyethylene alkyl ether phosphate and salts thereof, (wherein p represents an integer of 1 to 3, q represents an integer that satisfies the equation p + q = 3, r represents an integer of 2 to 10, R 1 and R 2 each independently represent an alkyl group having 1 to 4 carbon atoms, and R 3 represents an acrylic group, an acryloyl group, or a methacryloyl group).