Aqueous ink set, ink jet recording method and ink jet recording apparatus
AssigneeCanon Kabushiki Kaisha
InventorsSoichi Nagai, Masashi Ogasawara, Fumiaki Fujioka
Life of this patent
Estimating the term…
Abstract
An aqueous ink set for ink jet including a combination of a first ink and a second ink. The first ink includes a self-dispersible pigment to a particle surface of which a functional group that includes a phosphonic acid group is bonded, wherein the redispersion viscosity of the first ink is 5 mPa·s or less. The second ink includes an anionic dye, a lithium ion, and a sodium ion, wherein the total concentration of the lithium ion and the sodium ion in the second ink is 0.050 mol/L or more, and the proportion of the concentration of the lithium ion in the total concentration of the lithium ion and the sodium ion in the second ink is 45% or more to 85% or less.
Claims14
An aqueous ink set for ink jet comprising a combination of a first ink and a second ink,
- wherein the first ink includes a self-dispersible pigment to a particle surface of which a functional group that includes a phosphonic acid group is bonded, and a redispersion viscosity of the first ink as measured according to the following procedure is 5 mPa·s or less,
- wherein measurement of the redispersion viscosity being such that after 1.5 g of the first ink is stored for 15 hours under a temperature of 30° C. and a relative humidity of 10%, the first ink is added thereto in an amount of the thus-reduced mass followed by additional storing for 2 hours to thereby measure the viscosity of the resultant,
- wherein the second ink includes an anionic dye, a lithium ion, and a sodium ion, and a total concentration of the lithium ion and the sodium ion in the second ink is 0.050 mol/L or more, and
- wherein a proportion of a concentration of the lithium ion in the total concentration of the lithium ion and the sodium ion in the second ink is 45% or more to 85% or less.
An ink jet recording method comprising:
- a step of ejecting an ink from an ejection orifice of a recording head of an ink jet system to record an image on a recording medium;
- and
- a step of capping the ejection orifice with a cap,
- wherein the ink comprises an ink included in an aqueous ink set for ink jet which comprises a combination of a first ink and a second ink,
- wherein the first ink includes a self-dispersible pigment to a particle surface of which a functional group that includes a phosphonic acid group is bonded, and a redispersion viscosity of the first ink as measured according to the following procedure is 5 mPa·s or less,
- wherein measurement of the redispersion viscosity being such that after 1.5 g of the first ink is stored for 15 hours under a temperature of 30° C. and a relative humidity of 10%, the first ink is added thereto in an amount of the thus-reduced mass followed by additional storing for 2 hours to thereby measure the viscosity of the resultant,
- wherein the second ink includes an anionic dye, a lithium ion, and a sodium ion, and a total concentration of the lithium ion and the sodium ion in the second ink is 0.050mol/L or more, and
- wherein a proportion of a concentration of the lithium ion in the total concentration of the lithium ion and the sodium ion in the second ink is 45% or more to 85% or less.
An ink jet recording apparatus comprising:
- an ink storage portion within which an ink is stored;
- a unit for ejecting the ink from an ejection orifice of a recording head of an ink jet system to record an image on a recording medium;
- and
- a cap for capping the ejection orifice,
- wherein the ink comprises an ink included in an aqueous ink set for ink jet which comprises a combination of a first ink and a second ink,
- wherein the first ink includes a self-dispersible pigment to a particle surface of which a functional group that includes a phosphonic acid group is bonded, and a redispersion viscosity of the first ink as measured according to the following procedure is 5 mPa·s or less,
- wherein measurement of the redispersion viscosity being such that after 1.5 g of the first ink is stored for 15 hours under a temperature of 30° C. and a relative humidity of 10%, the first ink is added thereto in an amount of the thus-reduced mass followed by additional storing for 2 hours to thereby measure the viscosity of the resultant,
- wherein the second ink includes an anionic dye, a lithium ion, and a sodium ion, and a total concentration of the lithium ion and the sodium ion in the second ink is 0.050 mol/L or more, and
- wherein a proportion of a concentration of the lithium ion in the total concentration of the lithium ion and the sodium ion in the second ink is 45% or more to 85% or less.
Dependencies are inferred from the claim text.