| 摘要 |
PROBLEM TO BE SOLVED: To provide a foamed molding made of a polypropylene-based resin, which is excellent in heat resistance, strengths and moisture proof property because of its low pearmeability for water vapor or moisture. SOLUTION: This foamed molding made of the polypropylene-based resin is produced by heat molding of expandable particles containing as a base resin a propylene-based polymer satisfying the following requirements (a) and (b), and the foamed molding made of the polypropylene-based resin satisfies also the following requirement (c).(a) To have a 100-85 mol% structure unit obtained from propylene and a 0-15 mol% structure unit obtained from ethylene and/or a 4-20Cα-olefin. (b) The ratio of regioirregular units in total propylene insertion measured by 13C-NMR is within a specified range.(c) The moisture permeability and the density of the forming molding are in a specified relation. COPYRIGHT: (C)2004,JPO&NCIPI |
