INK, INK CARTRIDGE, AND IMAGE-RECORDING METHOD

摘要

An ink contains a pigment dispersed with polymer, a surfactant, a water-soluble organic solvent, and water. The mass ratio of a content of the pigment to a content of the polymer in the ink is more than 3. The surfactant includes a fluorinated surfactant which is represented by Formula (1) and which has an HLB of 11 or less as determined by a Griffin method. The water-soluble organic solvent includes at least one selected from specific Group A. The total content of the water-soluble organic solvents of the Group-A in the ink is larger than the total content of water-soluble organic solvents other than the water-soluble organic solvents of Group A in the ink.

主权项

1. An ink comprising:
a pigment dispersed with polymer; a surfactant; a water-soluble organic solvent; and water, wherein the mass ratio of a content of the pigment to a content of the polymer is more than 3; wherein the surfactant includes a fluorinated surfactant having an HLB value of 11 or less determined by a Griffin method and represented by Formula (1):
R1(CR2R3)nCH2CH2(OCH2CH2)mOHwherein, R1 represents a fluorine atom or a hydrogen atom; R2 and R3 each independently represent a fluorine atom or a hydrogen atom, provided that at least one of R2 and R3 represents fluorine atom; n represents a number of 1 or more and 30 or less; and m represents a number of 1 or more and 60 or less;
wherein the water-soluble organic solvent includes at least one water-soluble organic solvent selected from Group A consisting of glycerin, ethylene glycol, diethylene glycol, polyethylene glycol with a weight-average molecular weight of 10,000 or less, 1,3-propanediol, 1,4-butanediol, and diglycerol; and wherein the total content of the water-soluble organic solvents of the Group-A in the ink is larger than the total content of water-soluble organic solvents other than the water-soluble organic solvents of Group A in the ink.