Abstract: Process for making elastomer-resin masterbatch using an ester gum type resin and an elastomer in latex form, process that involves the following steps: (a) fine grinding of the ester gum resin; (b) adding of the finely grinded resin to latex contained in a reactor, while maintaining a low temperature and continuous agitation of the ingredients within the reactor, in order to produce an emulsion; (c) coagulating the emulsion produced in the reactor by adding a saturated solution of sodium chloride until reaching a sodium chloride concentration in the batch between 1 to 10% and then adding sulphuric acid to complete coagulation of the batch; (d) separating the coagulated solid formed in crumbs from the liquid phase, which is discarded; (e) washing repeatedly the formed crumbs with water until obtaining the desired purity; (f) eliminating the excess water contained in the crumbs until a predetermined degree of moisture is obtained; (g) bagging of the final product for its handling and sale.