Abstract: A process for making ABS and related resins which involves grafting an alkadiene elastomer with styrene-type and/or acrylonitrile-type monomers by emulsion polymerization to produce a grafted rubber latex, mixing with such grafted latex a mixture of at least one of the same monoethylenically unsaturated monomers and at least one saturated styreneacrylonitrile copolymer solvent in an amount of at least 5 percent by weight of such saturated solvent based upon the total weight of monomers and solvent, coagulating the grafted rubber particles from the latex, separating water from said mixture and subjecting the resulting dispersion of grafter rubber in said solvent and monomer mixture to continuous mass polymerization.