Patent ID: 7135062

Claim:
An image-recording, hydrophilic colorant represented by the following formula (1): (organic pigment)−(linking group)−(hydrophilic compound) (1) wherein the organic pigment is a hydrophobic pigment selected from the group consisting of perinone, dioxazine, quinacridone, diketopyrrolopyrole, quinophthalone, isoindolinone, and metal complex; the linking group is selected from the group consisting of an alkylene group. s-triazinyl group. s-triazinyl-2.4-diamino group. s-triazinyl-2.4-dioxy group. s-triazinyl-2-amino-4-oxy group, s-triazinyl-2.4-diaminoalkyl group, and s-triazinyl-2-aminoalkyl-4-oxy group; and the hydrophilic compound comprises one or more carboxyl groups, sulfone groups, sulfate ester groups, phosphate ester groups, primary amino groups, primary quaternary ammonium groups, secondary amino groups, secondary quaternary ammonium groups, tertiary amino groups, tertiary quaternary ammonium groups; alcoholic hydroxyl groups, polyethylene glycol grouos, polyethylene glycol monoalkyl ether groups; polyethylene glycol, monophthalate, polyethylene glycol monosulfate or polyethylene glycol monophosphate