| 摘要 |
PROBLEM TO BE SOLVED: To obtain a sheet of good thermoformability having very excellent rigidity and heat resistance by using a composition obtained by compounding a specified amount of tale having a specified particle size to polypropylene that has a specified melt flow rate value and an isotactic pendat fraction of a specified value or over. SOLUTION: The composition used comprises 90 to 50 wt.% of polypropylene having melt flow rate of 0.1 to 5/10 minutes and an isotactic pendat fraction (mmmm) of 0.97 or over, and 10 to 50 wt.% of tale having an average particle size of 0.5 to 9μm. It is preferred to further compound 0.1 to 5 pts.wt. of a polytetrafluoroethylenecontaining mixed powder made of polytetrafluoroethylene particles and organic polymer particles, each having a particle size of 10μm or below. The mixing ratio of the respective polymer particles in the mixed powder is such that 10 to 300 pts.wt. of the organic polymer particles are used per 100 pts.wt. of the polytetrafluoroethylene particles.
|
