Toner for developing electrostatic image and process for production thereof.

摘要

A toner for developing an electrostatic image is provided as a pulverized mixture which includes a binder resin and a colorant. The binder resin is characterized by the following molecular weight distribution on a GPC chromatogram for that part of the resin which is soluble in tetrahydrofuran (THF). This soluble part includes: 15% to 35% of a resin component in a molecular weight region of at most 5000 and at least 3 wt. % of a resin component in a molecular weight region of at least 5x10<6> and showing a main peak in a molecular weight region of 5000 to 10<5>. The binder resin also has an acid value of 2 - 100 mg KOH/g. The THF-soluble resin component in the molecular weight region of at least 5x10<6> is enriched during a melt-kneading step during the toner production. <IMAGE>