Abstract: A colored toner for developing electrostatic images which has a degree of gelation of 2.0% or less and comprises an association of secondary particles containing polymer particles having acidic polar groups or basic polar groups and an organic pigment and/or an organic dye treated with a treatment agent containing a surface treatment agent which has the same ionic character as the polymer particles so that the absolute value of .zeta.-potential becomes 10 to 100 mV at pH 5, and a developer for electrostatic images which comprises this colored toner and a carrier.

Abstract: A colored toner for developing electrostatic images which has a degree of gelation of 2.0% or less and comprises an association of secondary particles containing polymer particles having acidic polar groups or basic polar groups and an organic pigment and/or an organic dye treated with a treatment agent containing a surface treatment agent which has the same ionic character as the polymer particles so that the absolute value of .zeta.-potential becomes 10 to 100 mV at pH 5, and a developer for electrostatic images which comprises this colored toner and a carrier.

Abstract: A toner for developing an electrostatic image comprises primary colored resin particles having a mean particle size of 0.6 to 10 microns which have been agglomerated to form secondary particles having a particle size of 1.2 to 20 microns. The primary colored resin particles are formed from fine elementary particles comprised of one or more polymers and a colorant. Thus, the toner can be economically prepared, is excellent in resolution, does not cause much fogging or scattering, and is excellent in fixability and image density.

Abstract: This invention provides a toner composed of associated particles of secondary particles comprising primary particles of a polymer having an acidic or basic polar group and particles of a coloring agent and optionally a charge controlling agent and a process for producing the toner. Preferably, the contacting portions among the secondary particles are at least partly melt-adhered by film formation. The toner of the invention has excellent advantages. It has a much higher resolution than conventional products. It has excellent chargeability and causes hardly any occurrence of fogging.