| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a polypropylene resin porous sheet exhibiting excellent workability and vacancy formation in drawing and having good air permeability characteristics. <P>SOLUTION: The polypropylene resin porous sheet principally consists of a polypropylene resin composition, wherein a loss tangent peak temperature is observed at least two temperatures in a temperature range from -60 to 20°C when measured at a frequency of 10 Hz by dynamic viscoelasticity measurement, and has porosity of 1.1-5 times. <P>COPYRIGHT: (C)2013,JPO&INPIT |
