Polymerization toner and process for producing the same

The present invention relates to a polymerized toner and a production process thereof, and more particularly to a polymerized toner of a core-shell structure, which is suitable for use in developing an electrostatic latent image formed by an electrophotographic process, electrostatic recording process or the like, and a production process thereof. A polymerized toner of a core-shell structure that colored polymer particles containing a colorant are covered with a polymer layer, wherein the polymerized toner has features that (1) the content of tetrahydrofuran-insoluble matter is 60 to 95 wt. %, and (2) the weight average molecular weight of tetrahydrofuran-soluble matter as determined by gel permeation chromatography is 50,000 to 400,000, and a production process thereof.