A process for producing spherical composite cured melamine resin particles
excellent in water resistance, in which colloidal silica is localized
near the surface thereof, comprising (a) a step of reacting a melamine
compound with an aldehyde compound in an aqueous medium under a basic
condition in the presence of a suspension of colloidal silica having an
average particle size of 5 to 70 nm to produce an aqueous solution of a
precondensate of water-soluble melamine resin; and (b) a step of adding
an acid catalyst to the aqueous solution produced in the step (a) to
separate out spherical composite cured melamine resin particles.