Packaging material for flat electrochemical cell

摘要

In a packaging material for electrochemical cell, a thermally adhesive resin layer 8 is configured of a resin having a propylene based elastomer resin in a propylene based resin. This propylene based elastomer resin is a copolymer composed of a constitutional unit derived from propylene and a constitutional unit derived from an ±-olefin having from 2 to 20 carbon atoms; when the total sum of the constitutional unit derived from propylene and the constitutional unit derived from an ±-olefin is defined as 100 % by mole, contains 50 % by mole or more of the constitutional unit derived from propylene; and is satisfied with (a) a Shore A hardness (ASTM D2240) of from 65 to 90, (b) a melting point of from 130 to 170°C, (c) a density (ASTM D1505) of from 860 to 875 kg/m 3 and (d) a glass transition temperature as measured by DSC of from -25°C to -35°C.