EXPANDABLE POLYPROPYLENE RESIN PARTICLE AND MOLDED OBJECT OBTAINED THEREFROM BY IN-MOLD MOLDING

A specific relationship must be satisfied in case of: (a) a structural unit containing 100 to 85 mole % derived from propylene and 0 to 15 mole % derived from ethylene and/or alpha-olefin having 4 to 20 carbons; (b) the content of position irregularity units formed by 2, 1-insertions of propylene monomer units with respect to all propylene insertions is 0.5% to 2.0% as measured by 13C-NMR and the content of position irregularity units formed by 1,3-insertions of propylene monomer units with respect to all propylene insertions is 0.005% to 0.4% as measured by 13C-NMR; and (c) the water vapor transmission rate, which is Y Äg/m/24 hrÜ as a film, and the melting point TmÄ DEG CÜ exhibit a specific relationship.