30-05-2013 дата публикации
Номер: US20130137833A1
A resin composition for a solar cell encapsulant containing an ethylene.α-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, the solar cell encapsulant and a solar cell module using the same. 1. A resin composition , comprising: [{'sup': '3', '(a1) a density of 0.860 to 0.920 g/cm,'}, '(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,', {'sub': '1', 'sup': −1', '5, '(a3) a melt viscosity (η*) measured at 100° C. under a shear rate of 2.43×10 sof 1.2×10poise or more,'}, {'sub': '2', 'sup': 2', '−1', '4, '(a4) a melt viscosity (η*) measured at 100° C. under a shear rate of 2.43×10sof 2.0×10poise or more,'}, {'br': None, 'i': N≧−', 'E+, '0.67×53\u2003\u2003(a),'}, '(a5) a branch number (N) derived from a comonomer in a polymer that satisfies expression (a), 'wherein N represents the branch number per total 1000 carbon atoms in a main chain and a side chain, measured by NMR, and E represents a modulus of elasticity in tension of a sheet, measured in accordance with ISO1184-1983 and', {'sub': 10', '2.16', '10', '2.16, '(a6) a flow ratio (FR): a ratio (I/I) of Iwhich is an MFR measured value at 190° C. under a load of 10 kg, and Iwhich is an MFR measured value at 190° C. under a load of 2.16 kg, of below 7.0;'}], '(A) an ethylene.α-olefin copolymer satisfying (a1) to (a4) and one of (a5) and (a6)(B) an organic peroxide; and/or(C) a silane coupling agent.2. The resin composition of claim 1 , wherein (a5) the branch number (N) derived from a comonomer in a polymer satisfies expression (a′):{'br': None, 'i': E+', 'N≧−', 'E+, '−0.67×100≧0.67×53\u2003\u2003(a′).'}3. The resin composition of claim 1 , wherein (a5) the branch number (N) derived from a ...
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