| abstract |
A purpose of the invention is to provide a solar cell sealing material which is excellent in various characteristics such as transparency, flexibility, adherence, heat resistance, appearance, crosslinking characteristics, electrical characteristics, and calendaring formability. To achieve the purpose, a solar cell sealing material of ethylene. α -olefin copolymer is made, which satisfies the following requirements (a1) to (a4): (a1) the ratio of constituent units derived from ethylene is 80 mol% to 90 mol%, and the ratio of constituent units derived from α -olefin having 3 to 20 carbon atoms is 10 mol% to 20 mol%. (a2) the measured MFR at 190 DEG C and 2.16 kg load according to ASTM D1238 is no less than 2 g/10 min and less than 10 g/10 min. (a3) the measured density according to ASTM D1505 is 0.865 g/cm<SP>3</SP> to 0.884 g/cm<SP>3</SP>. a4) the measured Shore A hardness according to ASTM D2240 is 60 to 85. |