Multilayer films containing a fluorinated copolymer resin layer and an encapsulant layer

摘要

A multilayer film comprises a layer consisting essentially of a fluorinated copolymer resin film and a layer consisting essentially of a blend of two ethylene copolymers. The first ethylene copolymer comprises copolymerized units of ethylene, optionally a first olefin having the formula CH₂═C(R¹)CO₂R², and a second olefin having the formula CH₂═C(R³)COOH. The second ethylene copolymer consists essentially of copolymerized units of ethylene, optionally a first olefin having the formula CH₂═C(R¹)CO₂R², and a third olefin having the formula CH₂═C(R⁴)D. R¹, R³ and R⁴ represent hydrogen or an alkyl group; R² represents an alkyl group; and D represents a moiety containing an epoxy group. The multilayer film is useful as an integrated frontsheet or backsheet for photovoltaic modules. Methods for preparing the multilayer film and the photovoltaic modules are also included.