TONER COMPOSITION FOR DEVELOPING ELECTROSTATIC IMAGE

PURPOSE:To prevent fog in developing, and to render image density stable and uniform, by using a toner composn. contg. a polyvalent metal salt of polyvalent org. acid as a charge controller, and a colorant, and a binding resin. CONSTITUTION:A polyvalent org. acid, such as phthalic acid, and a salt of polyvalent metal, such as aluminum, e.g., aluminum phthalate, 3pts.wt., is used as a charge controller, together with 92pts.wt. styrene-acrylic resin and 5pts.wt. copper phthalocyanine pigment are kneaded, pulverized, and classified to obtain a toner. This 4pts.wt. toner is mixed with 100pts.wt. iron powder carrier, and dispersed to obtain a toner composn. for developing an electrostatic image. As a result of a series of successive copying test using a dry type electrophotographic copier, good images were obtained up to at least 10,000 cycles, and each had image quality free from image density.