Water-based ink for ink-jet recording, ink cartridge, ink-jet recording apparatus and method for producing water-based ink for ink-jet recording
There is provided a water-based ink for ink-jet recording including: a colorant including a self-dispersible pigment modified by a carboxylic acid group; a highly polymerized compound containing a carbodiimide group; an ether sulfate-based anionic surfactant; water; and a water-soluble organic solvent.
1. A water-based ink for ink jet recording comprising:
a colorant including a self-dispersible pigment modified by a carboxylic acid group;
a highly polymerized compound containing a carbodiimide group;
an ether sulfate-based anionic surfactant;
water; and
a water-soluble organic solvent,
wherein a blending amount of the highly polymerized compound containing the carbodiimide group with respect to an entire amount of the water-based ink is from 0.1% to 0.5% by weight.
2. The water-based ink for ink jet recording according to claim 1 , wherein the ether sulfate-based anionic surfactant is an alkyl ether sulfate-based anionic surfactant.
3. The water-based ink for ink jet recording according to claim 1 , wherein the ether sulfate-based anionic surfactant contains a polyoxyethylene structure.
4. An ink cartridge comprising a water-based ink for ink jet recording, wherein the water-based ink for ink jet recording is the water-based ink for ink-jet recording as defined in claim 1 .
5. The ink cartridge according to claim 4 , wherein the water-based ink for ink-jet recording is a water-based black ink.
6. An ink jet recording apparatus comprising:
an ink accommodating section which accommodates the ink cartridge as defined in claim 4 ; and
an ink discharge mechanism which discharges the ink included in the ink cartridge.
7. A method for producing a water-based ink for ink jet recording which includes a colorant including a self-dispersible pigment modified by a carboxylic acid group; a highly polymerized compound containing a carbodiimide group; an ether sulfate-based anionic surfactant; water; and a water-soluble organic solvent, the method comprising:
preparing a mixed liquid containing the ether sulfate-based anionic surfactant and one of the self-dispersible pigment modified by the carboxylic acid group and the highly polymerized compound containing the carbodiimide group; and
adding, to the mixed liquid, the other of the self-dispersible pigment modified by the carboxylic acid group and the highly polymerized compound containing the carbodiimide group,
wherein a blending amount of the highly polymerized compound containing the carbodiimide group with respect to an entire amount of the water-based ink is from 0.1% to 0.5% by weight.
8. The water-based ink for ink jet recording according to claim 1 , wherein a blending amount of the ether sulfate-based anionic surfactant with respect to an entire amount of the water-based ink is from 0.05% to 0.5% by weight.