| abstract |
[PROBLEMS] To provide a crystalline polyester resin of a new composition, a toner using the same, and a toner using the same, which achieves low-temperature fixing, secures chargeability under high temperature and high humidity, and is applicable to the aggregation and coalescence method. Provided image forming method. SOLUTION: As an acid-derived component constituting a polymer, two or more kinds of dicarboxylic acid-derived components are contained, and among all acid-derived components, an aromatic dicarboxylic acid-derived component having no sulfonic acid group. When the content is in the range of 0.5 to 30 constituent mol% and further contains a dicarboxylic acid-derived constituent component having a sulfonic acid group, it has the sulfonic acid group of all the acid-derived constituent components. A crystalline polyester resin having a dicarboxylic acid-derived constituent content of 5 constituent mol% or less. [Selection diagram] None |