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Expandable Foam from Amorphous Polyester Resin

A resilient foam that is both expandable and moldable was prepared from an amorphous polyester resin using a mixed blowing agent of a high-solubility compound and a low-permeability compound. The high-solubility compound permits a high degree of expansion, while the low-permeability compound renders secondary expandability. The polyester foam remedies the deficiencies of existing bead products. Polystyrene beads retain blowing agents but lack resilience. Polyolefin beads are resilient but do not retain blowing agent. The polyester foam board has a low thermal conductivity as well as excellent dynamic cushioning.