abstract |
Pre-expanded polypropylene-based resin particles include a polypropylene-based resin. The polypropylene-based resin satisfies tan δ≤0.32×V+0.1, where tan δ represents a loss tangent at an angular frequency of 0.1 rad/s in dynamic viscoelastic behavior measurement at 200° C. and V represents a melt fracture take-up speed (m/min) at 200° C. |