The pigment dispersants, pigment compositions, polymerizable compositions and modified pigments

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PROBLEM TO BE SOLVED : To provide a pigment dispersant which can easily disperse an organic pigment or even a pigment poor in dispersion stability such as carbon black, has high affinity to various dispersion media and can obtain a pigment dispersion body which is stable over a long period of time and to provide a pigment dispersion composition using the same.SOLUTION : There is provided a pigment dispersant represented by the general formula (1) : (A is a polymerizable group; Rand Rare each independently a single bond or a divalent hydrocarbon group having 1 to 16 carbon atoms; Xis a single bond, -O-, -CO-, -CO-O- or the like; Rto Rare each independently H, a halogen atom, a hydroxyl group or the like; B is a polymer chain.)