Functional core-shell impact modifiers of glycidyl methacrylate (GMA) functionalized methyl methacrylate-butadiene-styrene (MBS) have been prepared via a seeded semi-continuous emulsion polymerization. These functional MBS-GMA particles were blended with polyamide-6. Investigations by transmission electron microscopy showed a very good dispersion of the particles in the polymeric matrix, compared with blends of MBS with polyamide-6 where a third functional polymer styrene-maleic anhydride was added.