Ester wax and toner using the wax

An ester wax obtained by a process comprising a condensation reaction of carboxylic acid and alcohol,

• wherein the carboxylic acid contains a single kind of saturated linear monocarboxylic acid having 14 to 30 carbon atoms as a main component, and the single kind of carboxylic acid is contained in a ratio of 60 wt % or more of the entire carboxylic acid,
• the alcohol contains a single kind of saturated linear monohydric alcohol having 14 to 30 carbon atoms or a single kind of polyhydric alcohol having 2 to 6 hydroxyl groups and having 2 to 30 carbon atoms as a main component, and when the monohydric alcohol is the main component, the monohydric alcohol is contained in a ratio of 60 wt % or more of the entire alcohol, and when the polyhydric alcohol is the main component, the polyhydric alcohol is contained in a ratio of 80 wt % or more of the entire alcohol, and
• the process comprises adding a water-soluble organic solvent to an esterified crude product obtained by the condensation reaction in a ratio of 3 to 50 parts by weight with respect to 100 parts by weight of the esterified crude product, and performing neutralization with an aqueous alkali solution,
• wherein the water-soluble organic solvent has a boiling point that is a temperature exceeding a melting temperature of the esterified crude product but not more than 300° C., and has a specific gravity of 0.9 or more.