Patent ID: 8222324

Claim:
A process for producing a curable epoxy resin composition comprising polymer particles (B) and a curable epoxy resin (A), the polymer particles (B) comprising 5 to 50% by weight of a shell layer (B-2) and 50 to 95% by weight of a rubber particle core (B-1), and the polymer particles (B) being in an independently dispersed state of substantially primary particles in the epoxy resin (A); the process comprising the steps of bringing an organic medium (C) showing partial solubility in water into contact with an aqueous latex of polymer particles (B), then bringing an organic medium (D) having lower partial solubility in water than that of (C) into contact therewith to separate an aqueous layer substantially from the polymer particles (B), discharging the aqueous layer to obtain a dispersion (F) consisting essentially of the polymer particles (B) and the mixed organic mediums (C) and (D), without isolating the polymer particles (B) as a coagulated material, dissolving a curable epoxy resin (A) in the dispersion (F), and removing volatile components; and the polymer particles (B) being in an independently dispersed state of substantially primary particles in the dispersion (F).