PREPARATION OF FOAMED PROPYLENE RESIN MOLDING HAVING INTERCONNECTED VOIDS

摘要

PURPOSE:To prepare a foamed propylene resin molding having a satisfactory water permeability. CONSTITUTION:This resin molding is prepared by packing foamed propylene resin particles having a crystalline structure in which a high-temperature peak appears on the higher-temperature side of the intrinsic peak in the DSC curve and having an S/(6V<2/3>) value of 1 to 3 (wherein V [mm<3>] and S [mm<2>] represent the volume and surface area, respectively), a high-temperature peak heat quantity of 5-30J/g and a bulk density of 0.012-0.2g/cm<3> in a mold without application of internal pressure and heated at a temperature ranging from the melting point minus 30 deg.C to that plus 10 deg.C to effect secondary foaming.