Patent ID: 7723006

Claim:
A method for making a toner for electrostatic development by a suspension process accompanied with reverse-neutralization, the method comprising: (a) reacting a linear low molecular weight polymer having carboxyl groups at the end of a polymer chain with a basic compound to convert the polymer into neutral salt form and adding distilled water to the reaction product to prepare a water-dispersible resin composition as a dispersant; (b) mixing the water-dispersible resin composition with a colorant, a charge control agent, and a releasing agent using high shear force to form a colored resin dispersion; (c) pouring the colored resin dispersion into an aqueous acidic solution containing at least one acid compound while applying a high shear force to the acidic solution to reverse neutralize the neutral salt of the linear low molecular weight polymer and heating and stabilizing the solution to obtain toner particles; and (d) filtering and washing the toner particles two or three times repeatedly, and vacuum drying to form dried toner particles and mixing the dried toner particles with hydrophobic silica particles or titanium oxide particles in the range of 1-5 wt % based on the amount of the toner particles.