| 摘要 |
PROBLEM TO BE SOLVED: To obtain a molding reduced in compression set by molding expandable particles comprising a base resin being a mixture comprising a specified amount of a PP resin, a specified amount of a PS resin, and a specified amount of other polymer components so as to produce a molding having a specified apparent density and a specified SV value. SOLUTION: Expandable particles comprising a base resin being a mixture comprising 60-95 wt.% PP resin, 5-40 wt.% PS resin, and 0-30 wt.% other polymer components are molded to obtain a molding having an apparent density of 0.009-0.045 g/cm3 and an SV value of below 4.0. SV(%)=(VO-V)×100/VO (wherein VO is the volume (mm3) of a cut sample of the molding; and V is the volume of the sample as measured after it is subjected to drying, pressure reduction, and pressure restoration to normal pressure under specified conditions). The PP resin is a propylene (co)polymer resin containing at least 70 wt.% propylene component, and the other polymer components are polymers at least one of which is a compatibilizer and are exemplified by a high-density PE and a low-density PE.
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