SEALING MATERIAL FOR SOLAR CELL, SHEET FOR SOLAR-CELL SEALING, AND SOLAR CELL MODULE EMPLOYING THESE

摘要

[PROBLEMS] To provide a sealing material for solar cells which comprises olefin (co)polymers and is excellent in flexibility, stress-absorbing ability, transparency, low-temperature impact strength, etc. and the crosslinking of which can be omitted according to need to improve productivity. [MEANS FOR SOLVING PROBLEMS] The sealing material for solar cells comprises 1-40 parts by weight of polypropylene (i) having a propylene unit content of 90 mol% or higher and 60-99 parts by weight of a propylene/ethylene copolymer (ii) comprising 45-90 mol% propylene units, 10-25 mol% ethylene units, and 0-30 mol% units (a) derived from a C_4-20 a-olefin ((i)+(ii)=100 parts by weight). It further contains an ethylene/a-olefin copolymer (B) in an amount of 5-95 parts by weight per 95-5 parts by weight of the sum of (i) and (ii) ((i)+(ii)+(B)=100 parts by weight).