A BACK SHEET FOR PHOTOVOLTAIC MODULES

摘要

A back sheet (1) for a photovoltaic module (5) comprising a polymeric support (10) and a weather resistant layer (13), the weather resistant layer comprising a binder containing a crosslinkable group and an aliphatic isocyanate crosslinking agent, characterized in that the weather resistant layer further comprises an aromatic or an alicyclic isocyanate crosslinking agent, and wherein the molar ratio of the isocyanate groups of the aliphatic isocyanate crosslinking agents to the isocyanate groups of the aromatic and/or alicyclic crosslinking agents is ≤ 3.