| 主权项 |
1. An ink composition comprising:
a dispersion medium, wherein the dispersion medium is water-based and contains at least one hydrophilic solvent; at least one pigment dispersed in the dispersion medium; at least one dispersant, wherein the at least one dispersant is present at from about 0.05 wt % to about 15 wt % of the ink composition; at least one durable polymer; and at least one dispersion additive, wherein the at least one dispersion additive is a quinacridone derivative according to Formula Iwherein R1 and R2 are independently hydrogen; R3 and R4 are independently selected from the group consisting of hydrogen, alkyl, halogen, sulphonic acid or salts thereof, carboxylic acid or salts thereof, and a group -A-B; A is selected from the group consisting of alkyl and aryl; B is selected from the group consisting of alkyl, aryl, heteroaryl, cycloalkyl, heterocycloalkyl, —NHCOR5; R5 is selected from the group consisting of alkyl and aryl; wherein alkyl, aryl, heteroaryl, cycloalkyl, heterocycloalkyl, and R5 are independently further substituted or unsubstituted with alkyl, aryl, halogen, cyano, sulphonic acid or salts thereof, carboxylic acid or salts thereof. |
