In order to apply the recycled poly(vinyl butyral) (PVB) film as a compatibilizer, the effects of PVB on the morphology and mechanical properties of PP/Nylon 6 blends have been investigated. The morphology of PP/PVB blends show that the PVB particles are large and segregated from the PP matrix, whereas in Nylon 6/PVB blends, the PVB particles are uniformly dispersed in the Nylon 6 matrix as small spherical particles. The morphology of the binary PP/Nylon 6 blends showed a wide range of dispersed particles which were pulled away from the matrix, indicating no evidence of interfacial adhesion between the constituents. However, in the ternary PP/Nylon 6/PVB blends with 5∼10 wt % PVB, a reduction in the dispersed particle size was observed and the empty holes pulled away from the matrix were disappeared. In addition, the blends with 20 wt % PVB exhibited coarser and larger dispersion of the phases than the other blend compositions. As PVB was added, the elongation at break of the ternary blend was higher than that of PP/Nylon 6 system, implying better flexibility Although PVB is worth while as a toughening agent or impact modifier in PVB/Nylon 6 binary system, the role as a compatibilizer in PP/Nylon 6/PVB ternary blend is not so excellent as maleic anhydride modifiers.