| 摘要 |
A resin composition for a solar cell encapsulant containing an ethylene·±-olefin copolymer and an organic peroxide or a silane coupling agent or the like, and having superior heat resistance, transparency, flexibility and adhesion property to a glass substrate, as well as good balance between rigidity and cross-linking efficiency, a solar cell encapsulant and a solar cell module using the same. The resin composition for a solar cell encapsulant characterized by containing the ethylene·±-olefin copolymer (A), having the characteristics of the following (a1) to (a4), along with characteristics of (a5) or (a6), and the organic peroxide (B) or the silane coupling agent (C).
(a1) a density of 0.860 to 0.920 g/cm 3
(a2) a ratio, (Mz/Mn), of Z average molecular weight (Mz) and number average molecular weight (Mn) determined by a gel permeation chromatography (GPC), of 8.0 or less(a3) a melt viscosity (· * 1 ) measured at 100°C under a shear rate of 2.43×10 s -1 of 9.0×10 4 poise or less
(a4) a melt viscosity (· * 2 ) measured at 100°C under a shear rate of 2.43×10 2 s -1 of 1.8×10 4 poise or less
(a5) a branch number (N) derived from a comonomer in a polymer satisfying the expression (a):
(a6) a flow ratio (FR): a ratio (I 10 /I 2.16 ) of I 10 which is an MFR measured value at 190°C under a load of 10 kg, and I 2.16 which is an MFR measured value at 190°C under a load of 2.16 kg, of below 7.0. |
