Patent ID: 8163455

Claim:
A toner for image formation granulated by dispersing, emulsifying, or both dispersing and emulsifying an oil phase containing toner constituting materials in an aqueous medium, the toner constituting materials comprising: a binder resin comprising a polyester resin; a colorant; and a pigment dispersant which is a polyester derivative having an acid value ranging from 28 mgKOH/g to 50 mgKOH/g, and an amine value ranging from 1 mgKOH/g to 50 mgKOH/g, wherein the toner constituting materials satisfy the following Expressions 1 and 2: Binder resin:Pigment dispersant=100:5 Expression 1 0° C.≦α−β≦10° C. Expression 2 where Expression 1 represents a mass ratio, α is a glass transition temperature of the binder resin, and β is a glass transition temperature of a mixture of the binder resin and the pigment dispersant in the ratio of Expression 1.