Composition, pellet, and processes of making polypropylene foams

The present disclosure provides improved polypropylene-based compositions (formulations). The present disclosure further provides improved micro-pellets (non-foamed), which comprise the improved polypropylene-based composition. The improved polypropylene-based compositions have a reduced melting point (Tm) for the polypropylene resin while maintaining the stiffness of the micro-pellets for use infoaming procedures. Also, the disclosure further provides a new, dry method of preparing expanded polypropylene beads from micro-pellets without a liquid medium or steam, which thereby simplifies theproduction process and saves both energy and production costs.