| 摘要 |
PROBLEM TO BE SOLVED: To obtain a polypropylene-based sheet having a wide thermally moldable temperature range and extremely improved heat shrinkage in a cooling process after thermal molding. SOLUTION: This polypropylene-based sheet is obtained by dispersing a noncrystalline resin into two or more kinds of propylenes having 3-40 deg.C difference in melting point measured by a differential scanning calorimeter dispersed in a laminar state. The noncrystalline resin includes, for example, a noncrystalline polyolefin, a polymethyl methacrylate, a percarbonate, a polystyrene, etc. Preferably a noncrystalline polyolefin having >=80 deg.C glass transition temperature has an excellently improving effect on heat shrinkage in a cooling process after thermal molding among them. The dispersion of the noncrystalline resin in a laminar state comprises dispersing the noncrystalline resin into the polypropylenes in the flow direction of sheet (MD) in a laminar state. |
