| 摘要 |
PROBLEM TO BE SOLVED: To provide a molded product having a small shrinkage ratio for a mold and a small deformation ratio of a molded product, and being excellent in surface quality, in case of an in-mold expansion molded product that is produced by filling a polypropylene resin expandable particle in a mold and heat-forming with water vapor. SOLUTION: This polypropylene resin expandable particle comprises a polypropylene resin as a base resin, in which ethylene and/or butene-1 of 1-10 wt.% as a comonomer component is included, Z average molecular weight (Mz) is≥7.2×10<SP>5</SP>and <1.2×10<SP>6</SP>, and a ratio (Mz/Mw) of the Z average molecular weight (Mz) to weight average molecular weight (Mw) is >2.5 and≤3.0. COPYRIGHT: (C)2009,JPO&INPIT
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