Ink jet ink and ink jet recording method

Compositions: coating or plastic – Coating or plastic compositions – Marking

Reexamination Certificate

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C106S031600, C106S031580, C106S031860

Reexamination Certificate

active

11219807

ABSTRACT:
Ink jet ink which sufficiently suppresses curling phenomenon of printed matters and satisfies ejection stability, the ink comprising at least water, a colorant, a water-soluble organic compound1and a water-soluble organic compound2, wherein the content X(%) of the water-soluble organic compound1is 10 mass % or more based on the total amount of the ink jet ink and the content X(%) of the water-soluble organic compound1and the content Y(%) of the water-soluble organic compound2based on the total amount of the ink jet ink satisfy the relation of the following formula (I) and formula (II):in-line-formulae description="In-line Formulae" end="lead"?0<Y/X≦0.9,   (I)in-line-formulae description="In-line Formulae" end="tail"?in-line-formulae description="In-line Formulae" end="lead"?X+Y≧15 mass %,   (II)in-line-formulae description="In-line Formulae" end="tail"?and wherein the water-soluble organic compound1is a water-retentive, water-soluble organic compound having a difference between the water retention ability in an environment of a temperature of 23° C. and a humidity of 45% and the water retention ability in an environment of a temperature of 30° C. and a humidity of 80% of 36% or less, and the water-soluble organic compound2is a water-soluble organic compound other than the colorant and the water-soluble organic compound1.

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