The present work is dealing with a deep understanding on the migration phenomenon of small macromolecules on the post-consumer agricultural waste multilayer films. Through a classical and new developed experiments, the surface and bulk properties were systematically investigated on both model and recycled multiphase systems based on different polyethylene matrices and polyisobutylene (PIB) as a minor phase. The PIB is as pressure sensitive adhesive (PSA) added to the primitive multilayer systems in order to obtain an autohesive surface for bale wrapping films applications. However, this PIB migration to the surface is not required in the recycled multiphase system. Subsequent, the shear, elongation and morphological properties were firstly explored and studied. Secondly, a quantitative investigation was performed and particularly developed, using Tack test and Tribology to quantify and model the diffusion process. Therefore, it was shown that the polyethylene shear rheological properties were influenced despite the small PIB amounts. Meanwhile, this migration influence drastically the slippage properties at long migration times. Furthermore, the elongation properties were indeed very sensitive in uniaxial flow especially for low molar masses of PIB, which seems to hold back the strain hardening properties of polyethylene. Moreover, the influence of the polyethylene crystallization morphology on the migration of PIB molecules was studied, showing that the diffusion is different for each type of polyethylene matrix used and their the branching architecture. Hence, the obtained results contributed to highlighting a new insight of macroscopic effects that were governed by PSA migration effects depending on the polyethylene architectures, temperature and aging times. Finally, mineral fillers of different nature, size and shape were therefore added, demonstrating their role to inhibit the diffusion process of the PIB in the recycled films.