| 摘要 |
PURPOSE:To obtain the titled molded article having improved dynamic buffering characteristics, permanent compression set resistance, etc., by foaming a specific propylene resin under specific conditions, foaming the resultant uncrosslinked foamed particles in a mold, and fusing and integrating the surfaces of the particles together. CONSTITUTION:(B) A volatile organic foaming agent having -50-+110 deg.C boiling point in the surface parts of foamable resin particles containing (A) propylene-ethylene random copolymer, consisting of 90wt% or more propylene component and 10wt% or less ethylenic component, and having <=0.7 randomness factor (R), <40% stereoregularity (II) and 50-35 deg.C Vicat softening point under 5kg/cm<2> load and (B) the volatile organic foaming agent is preferentially volatilized, and the whole particles are then foamed to give foamed particles having a thick-wall skin. The foaming ability is then given to the foamed particles, which are in an uncrosslinked state foamed under heating in a mold to fuse and integrate the surfaces of the particles together so that the thickness of the fused film may be 8 times or more that of the cellular wall of the particles in the molded article. Thus, the aimed molded article is obtained. |
