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In this study, MMT-Cu²⁺ has been prepared via an ion exchange process. After its characterization to prove the effective intercalation of copper into the MMT, and the confirmation of its antibacterial activity, the modified nanoclay is used to formulate PP/MMT-Cu²⁺ composites, PLA/MMT-Cu²⁺ composites and (50/50) PP/PLA blend composites by varying the MMT-Cu²⁺ ratios. These materials were subjected to several investigations such as X-rays diffraction, antimicrobial activity and environmental tests. The characterization of the modified MMT by XRD analyses showed an increase in the basal space. An additional evidence of the presence of copper ions into the mineral is provided by the inhibitory activity against the bacterial growth revealed by the PLA composites. The incorporation of MMT-Cu²⁺ to the PLA and (50/50) PP/PLA blend accentuated their aptitude to water absorption and ensured an efficient antimicrobial activity over a satisfactorily long period of around six months.