Aqueous ink, ink cartridge and ink jet recording method
To provide an aqueous ink that can suppress the dissolution of silicon or a silicon compound contained in a recording head, can be stably, continuously ejected for a long time, and enables the recording of an image having excellent glossiness. An aqueous ink for ink jet includes a pigment, a resin dispersant for dispersing the pigment, an alkanolamine and a urethane resin. The pigment is a solid solution containing C.I. Pigment Red 122 and C.I. Pigment Violet 19, and the proportion (% by mass) of the C.I. Pigment Red 122 is 10% by mass or more to 90% by mass or less based on the total mass of the solid solution.
1. An aqueous ink for ink jet, the aqueous ink comprising:
a pigment;
a resin dispersant for dispersing the pigment;
an alkanolamine; and
a urethane resin, wherein
the pigment is a solid solution including C.I. Pigment Red 122 and C.I. Pigment Violet 19, and in the solid solution, a proportion (% by mass) of the C.I. Pigment Red 122 is 10% by mass or more to 90% by mass or less based on a total mass of the solid solution.
2. The aqueous ink according to claim 1 , wherein in the solid solution, the proportion (% by mass) of the C.I. Pigment Red 122 is 10% by mass or more to 45% by mass or less based on the total mass of the solid solution.
3. The aqueous ink according to claim 1 , wherein the urethane resin has a unit derived from a polyisocyanate, a unit derived from a polyol having no acid group and a unit derived from a polyol having an acid group, and a proportion of a unit derived from the polyol having an acid group present at a molecular terminal relative to the whole unit derived from the polyol having an acid group is 30% or less.
4. The aqueous ink according to claim 3 , wherein the polyisocyanate is isophorone diisocyanate.
5. The aqueous ink according to claim 3 , wherein the polyol having no acid group is a polypropylene glycol.
6. The aqueous ink according to claim 1 , wherein in the urethane resin, a proportion of a urethane bond relative to a total amount of a urethane bond and a urea bond is 85.0% by mole or more.
7. The aqueous ink according to claim 1 , wherein a content (% by mass) of the urethane resin relative to a content (% by mass) of the pigment in terms of mass ratio is 0.10 times or more to 1.00 time or less.
8. The aqueous ink according to claim 1 , wherein the alkanolamine is triethanolamine.
9. An ink cartridge comprising:
an ink; and
an ink storage portion storing the ink,
the ink comprises the aqueous ink according to claim 1 .
10. An ink jet recording method comprising:
ejecting an ink from an ink jet recording head to record an image on a recording medium,
the ink comprises the aqueous ink according to claim 1 .