The concern about the environment and natural resources has been one of the most outstanding restlessness of contemporary worldwide society. For this reason, the polymer recycling materials emerges as an option that implies benefits and ecological improvement both in the reduction of waste and conservation of natural resources. The systems that have received most attention are those in which the constituents are reactive with each other, such as mixtures of polyethylene terephthalate (PET) and polycarbonate from bisphenol A (PC). In the present work, blends were developed from PET and PC from post-consumer residues formulated with the incorporation of a molecular chain extender additive, through the extrusion-ultrasound process, with the objective of revitalizing the recycled material through both polymers compatibilization. The study was divided into four stages: base formulations, percentage of suitable extender additive, adequate fill percentage, and single screw extrusion-sonication parameter process determinations. The structural molecular modifications were evaluated through tensile mechanical properties, differential scanning calorimetry, infrared spectroscopy, melt flow index and rheological measurements. It was found that the addition of a chain extender additive and extrusion–ultrasound process causes an increase in blend melt viscosity due at higher molecular weight produced. Also, it improved the compatibility between PET and PC, effect attributed to the copolymer generated by transesterification reaction. Additionally, this copolymer contributes to PET-PC miscibility observed by the glass transition temperature displacement. Blends with a filler material such as CaCO3 leaded to highest values of Young's modulus because the excellent particles dispersion through entire polymer matrix by the effect of extrusion-ultrasound technique