Polymerized toner having low-temperature fixing ability

A polymerized toner produced by polymerizing a polymerizable monomer composition comprising a polymerizable monomer, a colorant and a release agent in an aqueous medium, in which the toner is used as a core layer and a shell layer is formed around the core layer by covering the core layer, the core layer comprising a substance having a low-softening point and the shell layer comprising a substance having a high-softening point,

• wherein the polymerizable monomer comprises a crosslinkable polymerizable monomer in an amount of from 0.1 part by weight to 5 parts by weight per 100 parts by weight of a monovinyl monomer in the polymerizable monomer, and wherein:
• (1) the release agent is an ester compound;
• (2) the release agent is in the content from 1 part by weight or more to 9 parts by weight or less per 100 parts by weight of a monovinyl monomer in the polymerizable monomer;
• (3) a maximum endothermic peak temperature in a DSC curve of the release agent is in the range from 55° C. or more to 90° C. or less;
• and
• (4) a melt index value of the polymerized toner at 150° C. under load of 98 N (10 kgf) is in the range from 1 g/10 min or more to 30 g/10 min or less.