TONER FOR DEVELOPING ELECTROSTATIC CHARGE IMAGE

摘要

PURPOSE: To obtain a toner excellent in aging stability and heat resistance by sticking two kinds of fine particles different from each other in particle diameter to toner particles so that the surfaces of the toner particles are almost perfectly coated with the fine particles. CONSTITUTION: Fine particles whose particle diameter is smaller than that of toner particles are stuck to the surfaces of the toner particles to obtain the objective toner. The fine particles stuck to the toner particles are two kinds of fine particles different from each other in particle diameter and the surfaces of the toner particles are almost perfectly coated with the fine particles. The fine particles are preferably fine resin particles having 80-100 deg.C glass transition temp. or inorg. fine particles as 1st fine particles and fine resin particles having 50-70 deg.C glass transition temp. as 2nd fine particles. The particle diameter of the 2nd fine particles is smaller than that of the 1st fine particles. The particle diameter of the 1st fine particles is preferably 0.2-3μm and that of the 2nd fine particles is preferably 0.03-0.1μm.