Abstract: The invention relates to a process for producing a phosphate, which includes reacting a phosphorus pentaoxide-containing phosphorylating agent with an organic hydroxy compound, the reaction being carried out at a reaction temperature of 50 to 70° C. until the degree (w) of remaining phosphorus pentaoxide undissolved in a reaction solution, defined by the following equation (1), is reduced to 15 wt % or less: W=[1?(AVt?AVp)/AV0]×100??(1) wherein W is the degree [wt %] of remaining phosphorus pentaoxide undissolved in a reaction solution; AVt is the acid value [mg KOH/g] of the reaction solution excluding undissolved phosphorus pentaoxide in an arbitrary time; AVp is the theoretical acid value [mg KOH/g] of the phosphorylating agent excluding undissolved phosphorus pentaoxide; and AV0 is the theoretical acid value [mg KOH/g] of phosphorus pentaoxide.

Abstract: A process for preparing an aqueous dispersion of a pigment, comprising kneading a mixture containing a pigment, a polymer having a salt-forming group, a neutralizing agent for neutralizing the polymer having a salt-forming group, an organic solvent and water, wherein the concentration of the solid matter is 50 to 80% by weight; adding water and/or an organic solvent to the resulting kneaded mixture to dilute the mixture; and dispersing the solid matter in the resulting diluted mixture; and a water-based ink comprising the aqueous dispersion of a pigment.

Abstract: The invention relates to a process for producing a phosphate, which includes reacting a phosphorus pentaoxide-containing phosphorylating agent with an organic hydroxy compound, the reaction being carried out at a reaction temperature of 50 to 70° C. until the degree (w) of remaining phosphorus pentaoxide undissolved in a reaction solution, defined by the following equation (1), is reduced to 15 wt % or less: W=[1?(AVt?AVp)/AV0]×100??(1) wherein W is the degree [wt %] of remaining phosphorus pentaoxide undissolved in a reaction solution; AVt is the acid value [mg KOH/g] of the reaction solution excluding undissolved phosphorus pentaoxide in an arbitrary time; AVp is the theoretical acid value [mg KOH/g] of the phosphorylating agent excluding undissolved phosphorus pentaoxide; and AV0 is the theoretical acid value [mg KOH/g] of phosphorus pentaoxide.

Abstract: A process for preparing a water-based pigment dispersion, including the steps of (A) mixing an emulsified composition containing a water-insoluble polymer having a salt-forming group, an organic solvent having a solubility of 5 to 40 parts by weight in 100 parts by weight of water at 20° C., a neutralizing agent and water with a pigment so that the content of non-volatile components in the mixture of the emulsified composition and the pigment is 15 to 50% by weight, and the weight ratio of the organic solvent to water (weight of organic solvent/weight of water) is 0.1 to 0.9; (B) dispersing the resulting mixture; and (C) removing the organic solvent from the mixture. The water-based pigment dispersion prepared by the process can be suitably used, for instance, in a water-based ink for inkjet recording being capable of giving an ink mechanical energy generated by piezoelectric element or the like, and thermal energy generated by a heating member, thereby jetting the ink from a jetting head.

Abstract: A process for preparing an aqueous dispersion of a pigment, comprising kneading a mixture containing a pigment, a polymer having a salt-forming group, a neutralizing agent for neutralizing the polymer having a salt-forming group, an organic solvent and water, wherein the concentration of the solid matter is 50 to 80% by weight; adding water and/or an organic solvent to the resulting kneaded mixture to dilute the mixture; and dispersing the solid matter in the resulting diluted mixture; and a water-based ink comprising the aqueous dispersion of a pigment.

Abstract: A process for preparing an aqueous dispersion of pigment-containing polymer particles, comprising the steps of (A) removing an organic solvent from a mixture (I) comprising an organic solvent solution of a polymer, water and optionally a neutralizing agent to give a solvent-removed product; and (B) subjecting the solvent-removed product obtained in step (A) to a dispersion treatment, wherein a pigment is added to the mixture (I) or the solvent-removed product. The aqueous dispersion of pigment-containing polymer particles can be suitably used for a water-based ink for inkjet printing.

Abstract: A process for preparing an aqueous dispersion of pigment-containing polymer particles, comprising the steps of (A) removing an organic solvent from a mixture (I) comprising an organic solvent solution of a polymer, water and optionally a neutralizing agent to give a solvent-removed product; and (B) subjecting the solvent-removed product obtained in step (A) to a dispersion treatment, wherein a pigment is added to the mixture (I) or the solvent-removed product. The aqueous dispersion of pigment-containing polymer particles can be suitably used for a water-based ink for inkjet printing.