Patent ID: 8672465
Filing Date: 2014-03-18
Classification: B41J,C09D

Abstract:
1. An ink jet recording method comprising: a step of ejecting a black ink and at least one water-based color ink to a plain paper provided as a recording medium, wherein the black ink comprises water, a plurality of different water-soluble organic solvents, and a water-insoluble coloring material, wherein the water-soluble organic solvents comprise at least one good solvent to the water-insoluble coloring material and a plurality of poor solvents to the water-insoluble coloring material, wherein the total amount A (% by mass) of the good solvent or good solvents in the black ink and the total amount B (% by mass) of the poor solvents in the black ink are in a ratio A:B of from 10:5 to 7:9 both inclusive, wherein at least one of the plurality of poor solvents is selected from the group consisting of diethylene glycol, polyethylene glycol, and 2-pyrrolidone, wherein the water-insoluble coloring material is a self-dispersing pigment having at least one hydrophilic group attached onto a surface of a pigment particle via another group of atoms, wherein the black ink contains no resin dispersant, wherein one of the plurality of poor solvents shows a Ka value determined by the Bristow method which is the largest among the Ka values of all the water-soluble organic solvents in the black ink, and wherein a scanning operation for applying the at least one water-based color ink is performed after a scanning operation for applying the black ink is performed.