Patent ID: 8741048

Claim:
A water-based ink for ink jet recording comprising: a self-dispersible pigment modified by phosphate group; water; a water-soluble organic solvent; a cationic surfactant which is contained at 0.001% by weight to 0.05% by weight in the water-based ink for ink-jet recording; and at least one selected from the group consisting of boric acids or a salt thereof, a chelate agent, a reducing sugar and a sugar alcohol, wherein a weight ratio of the boric acids or salt thereof with respect to the cationic surfactant ranges from 10:1 to 100:1, a weight ratio of the chelate agent with respect to the cationic surfactant ranges from 10:1 to 100:1, a weight ratio of the reducing sugar with respect to the cationic surfactant ranges from 40:1 to 670:1, and a weight ratio of the sugar alcohol with respect to the cationic surfactant ranges from 40:1 to 540:1.