| 摘要 |
PROBLEM TO BE SOLVED: To provide a polypropylene-based (multilayer) expanded sheet of a non-crosslinked type which comprises uniform fine cells and is excellent in appearance and thermoformability, and a thermoformed product using the same. SOLUTION: The polypropylene-based expanded sheet is obtained by extrusion-molding a propylene-based resin composition comprising a propylene-based polymer (X) and a foaming agent (F). The propylene-based polymer (X) comprises a component (A) which becomes insoluble in p-xylene at 25°C and a component (B) which dissolves in p-xylene at 25°C, and satisfies the following (i) to (iv); (i) a weight average molecular weight (Mw) measured by GPC is 100,000-1,000,000, (ii) a component insoluble in hot p-xylene occupies≤0.3 wt.%, (iii) a degree of stain hardening (λmax) in measurement of elongation viscosity is≥2.0, and (iv) an MFR (230°C, 2.16 kg load) is 0.1-20 g/10 min. COPYRIGHT: (C)2010,JPO&INPIT |
