PRE-EXPANDED POLYAMIDE BEADS, MOLDED POLYAMIDE FOAM, AND PRODUCTION METHOD THEREFOR

摘要

Polyamide pre-expanded particles of this disclosure have a peak temperature of a maximum endothermic peak of 150 °C or higher and 275 °C or lower on a DSC curve obtained while being heated from 30 °C to 280 °C under a condition of a heating rate of 10 °C/min using a differential scanning calorimeter. The width of the maximum endothermic peak is 30 °C or greater and 80 °C or smaller when a straight line approximating the DSC curve on a high-temperature side relative to the maximum endothermic peak after an end of melting is used as a baseline. The width corresponds to a difference between an extrapolated melting start temperature which is a temperature at an intersection point between a tangent line at an inflection point of the maximum endothermic peak on a low-temperature side and the baseline, and an extrapolated melting end temperature which is a temperature at an intersection point between a tangent line at an inflection point of the maximum endothermic peak on a high-temperature side and the baseline.