Patent ID: 7935884

Claim:
An encapsulant layer for photovoltaic module, wherein the encapsulant layer for photovoltaic module is used in a photovoltaic module formed by laminating: a transparent front face substrate; a photovoltaic cell carrying a wiring electrode and a takeoff electrode, and the encapsulant layer is placed on at least one surface of the photovoltaic cell; and a rear face protecting sheet, in this order, wherein the encapsulant layer for photovoltaic module comprises a separable layer, formed mainly of a thermoplastic resin which is a copolymer of a polyethylene for polymerization and an ethylenically unsaturated silane compound, has a gel fraction of 10% or less, has no silanol catalyst added, and has: (a) a peeling strength from the transparent front face substrate, measured in a 180° peeling test under a 25° C. atmosphere, in a range of 1 N/15 mm width to 150 N/15 mm width, (b) a Vicat softening temperature, measured based on JIS standard K7206, in a range of 60° C. to 128° C., and (c) a melt mass flow rate, measured based on JIS standard K7210, in a range of 0.1 g/10 min to 50 g/10 min, and further wherein (d) an output maintenance factor of photoelectronic power, before and after a test measured based on a standard, of the photovoltaic module using the encapsulant layer is in a range of 80% to 100%.