Method for manufacturing magnetically attractive toner particles and particle

摘要

A method for manufacturing magnetically attractive toner particles utilized for developing electrostatic latent images includes a first step of thermally kneading a mixture of a first resin material and minute particles of magnetizable material, and a second step of thermally kneading, with a second resin material having a higher softening temperature and/or a physically harder nature being further added at the same time, so that a mixture of these three materials, as a whole, is to constitute a composite material having a specific crushing nature. The composite material thus treated is consequently solidified, and then crushed, to form the toner particles, whereby minute particles of magnetizable material comprising each toner particle are respectively to be exposed from an outer boundary of the toner particle.