Colored polymer particles, method for producing the same, and toner and developer using the same

A method for producing colored polymer particles, comprising:

• adding a colorant-containing composition comprising a radically polymerizable monomer and a colorant in a supercritical fluid or a subcritical fluid and polymerizing the radically polymerizable monomer, so as to produce colored polymer particles which are insoluble in the supercritical fluid or subcritical fluid,
• wherein the supercritical fluid or subcritical fluid is a supercritical fluid or subcritical fluid in which at least the radically polymerizable monomer is soluble, but polymer particles resulted from polymerization of the radically polymerizable monomer are insoluble, and wherein the supercritical fluid or subcritical fluid further comprises a releasing agent, and the colored polymer particles contain the releasing agent, wherein the releasing agent is dispersed in the radically polymerizable monomer so as to form a dispersion liquid of the releasing agent, and the dispersion liquid of the releasing agent is added in the composition, and
• wherein the colorant is at least one selected from the group consisting of a pigment, a dye and a polymer dye.