Patent ID: 9315683
Filing Date: 2016-04-19
CPC Classification: B41J,C09D

Claim Text:
1. An ink for ink jet, comprising a first pigment and a second pigment, wherein the first pigment is a self-dispersible pigment to a surface of a particle of which a first functional group containing a phosphonic acid group is bonded; the second pigment is a self-dispersible pigment to a surface of a particle of which a second functional group not containing a phosphonic acid group but containing an anionic group other than the phosphonic acid group, and further containing another atomic group is bonded; and the introduced amount of the functional group of the second pigment is 0.25 mmol/g or more, wherein the introduced amount of the functional group of the first pigment is 0.10 mmol/g or more to 0.33 mmol/g or less.