biodegradable polymeric composition and method for producing a biodegradable polymeric composition , comprising poly or copolymers thereof , a plasticizer obtained from a renewable source , a nucleant additive , a flow aid additive , and a thermal stabilizer additive . the process of obtention comprises the steps of mixing to a load of phb or phbv in powder , from about 2 % to 30 % of a plasticizer based on vegetable oils of natural origin and fatty acids of animal and vegetable origin , distilled and hydrogenated ; mixing to the biopolymer already containing the plasticizer a thermal stabilizer additive , a nucleant additive ; and a flow aid additive ; and extruding the composition obtained in the previous step to promote , in the melt state , the incorporation of the additives in the matrix of phb or phbv and its subsequent granulation .