Patent ID: 9537035
Date: 2017-01-03
CPC Classifications: B32B,H01L,Y02E

Claim:
1. A back face protection sheet for solar cell modules comprising a hydrolysis resistant polyethylene terephthalate film laminated with a white polyethylene film which is a three-layered film with a structure of A1 layer/B1 layer/C1 layer, wherein, the A1 layer is comprises a resin containing an ethylene/α-olefin copolymer with a density of 0.92 g/cm 3 to 0.95 g/cm 3 as a primary component mixed with a low density polyethylene and a propylene based resin, the B1 layer comprises an ethylene/α-olefin copolymer material containing 100 parts by weight of a resin component and 5 to 30 parts by weight of rutile titanium oxide particles coated with an inorganic oxide and having an average particle diameter of 0.2 to 0.5 μm, and the C1 layer comprises an ethylene/α-olefin copolymer with a density of 0.92 g/cm 3 to 0.95 g/cm 3 mixed with a low density polyethylene, propylene based resin, and inorganic and/or organic particles with an average particle diameter of 1 to 5 μm by an adhesive produced by mixing 100 parts by weight a polyester polyol (a) with 5 to 30 parts by weight of an epoxy resin (b), 1 to 10 parts by weight of a carbodiimide compound (d), 10 to 30 parts by weight of a polyisocyanate compound (e), and 5 to 30 parts by weight of a polycarbonate polyol (c).