| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a method for manufacturing a water-based pigment dispersion and water-based pigmented recording liquid using a phthalocyanine pigment, which does not alter the composition of raw materials in a product designing, does not increase granulation so much even if it receives a high temperature history, gives such high dispersion stability as not to cause clogging of a nozzle of and a discharge failure of a recording liquid and gives printed matters excellent in the light resistance and also is excellent in the productivity. <P>SOLUTION: The method for manufacturing a water-based pigment dispersion, comprising the first step of dispersing finely a phthalocyanine pigment, an anionic group-containing noncrosslinkable organic polymer compound, a basic substance, an organic solvent and water, and the second step of removing the above organic solvent from the water-based pigment dispersion obtained in the first step, is characterized by using as the above solvent an alcoholic or ketonic solvent which dissolves the above polymer compound and has a boiling point, under an ordinary pressure, of 100°C or lower and by providing between the above first step and the second step a step of heating the water-based pigment dispersion containing the above solvent at a temperature of higher than 100°C and 150°C or lower in a closed system. <P>COPYRIGHT: (C)2004,JPO |
