| 摘要 |
PROBLEM TO BE SOLVED: To provide a sheet excellent in balance among flexibility, transparency and heat resistance.SOLUTION: A sheet consists of a propylene-based thermoplastic elastomer composition containing a propylene-ethylene block copolymer (X) satisfying following (i) to (v) of 20 to 50 pts.wt. and a thermoplastic elastomer (Y) of 50 to 80 pts.wt. based on total 100 pts.wt. of (X)(Y), and the thermoplastic elastomer (Y) contains a propylene/α-olefin copolymer (Y1) of 65 to 95 pts.wt. and an ethylene/α-olefin copolymer (Y2) of 5 to 35 pts.wt. based on total 100 pts.wt. of (Y1)(Y2). (i) The propylene-ethylene block copolymer obtained by sequentially polymerizing propylene only or a propylene-ethylene random copolymer component (A) having an ethylene content of 7 wt.% or less of 30 to 95 wt.% in a first process and a propylene-ethylene random copolymer component (B) having 3 to 20 wt.% more ethylene than the component (A) of 70 to 5 wt.% in a second process by using metallocene catalyst. (ii) MFR is 0.5 to 100 g/10 min. (iii) A melting peak temperature of 110 to 150°C. (iv) A molecular weight distribution (Mw/Mn) is 1.5 to 4. (v) tanδ curve in a temperature-loss tangent curve has a single peak at 0°C or lower. |
