Patent ID: 9353278
Filing Date: 2016-05-31
CPC Classification: B41J,C08K,C09D

Claim Text:
1. An ink comprising: a self-dispersible pigment; a polyurethane polymer particle; a surfactant; a water-soluble organic solvent; and water, 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): wherein, R 1 represents a fluorine atom or a hydrogen atom; R 2 and R 3 each independently represent a fluorine atom or a hydrogen atom, provided that at least one of R 2 and R 3 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; 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; and wherein the mass ratio of the total content of the water-soluble organic solvents of the Group A to the total content of water-soluble organic solvents other than the water-soluble organic solvents of Group A, based on the total mass of the ink, is 10 or more.