| 摘要 |
PURPOSE: Provided is a method for solubilization for certain classes of pigments in which a fairly acidic proton is substituted for a water-soluble group on the surface of the pigment particle. CONSTITUTION: The method for self-dispersing a pigment in an aqueous solution, comprises (a) providing a pigment having an azo group and either a beta-diketo structure or a hydroxyl group, each conjugatively associated with the azo group; (b) treating the pigment with a base having sufficient strength to generate a negative charge on the pigment; and (c) reacting the negatively charged pigment with either (1) a first hydrophilic molecule containing at least one functional group comprising a carbon-carbon double bond and a carbonyl that is alpha to the carbon-carbon double bond which reacts via addition to form a hydrophilic group on the pigment or (2) a second hydrophilic molecule containing at least one functional group which is an anionic functional group, a cationic functional group, or a zwitter-ionic functional group and at least one leaving group which reacts via substitution to form a hydrophilic group on the pigment.
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