| 摘要 |
The present invention is concerned with expanded propylene resin beads including a core layer being in a foamed state and constituted of a propylene-based resin composition (a) and a cover layer constituted of an olefin-based resin (b), the propylene-based resin composition (a) satisfying the following (i) and (ii), and the olefin-based resin (b) satisfying the following (iii) or (iv).
(i) A mixture of 75% by weight to 98% by weight of a propylene-based resin (a1) having a melting point of 100°C to 140°C and 25% by weight to 2% by weight of a propylene-based resin (a2) having a melting point of 140°C to 165°C.
(ii) A difference between the melting point of the resin (a2) and the melting point of the resin (a1) is 15°C or more.
(iii) A crystalline olefin-based resin having a melting point TmB that is lower than a melting point TmA of the composition (a) and having a relation of 0°C < [TmA - TmB] ‰¤ 80°C.
(iv) A non-crystalline olefin-based resin having a softening point TsB that is lower than TmA and having a relation of 0°C < [TmA - TsB] ‰¤ 100°C. |
