BACKSHEET FILM WITH IMPROVED HYDROLYTIC STABILITY

摘要

This disclosure generally relates to films capable of use in photovoltaic modules, to films, to methods of use and manufacture of these films, and to photovoltaic cells and/or modules including these films. One exemplary embodiment of such a film is a barrier layer having a moisture vapor transmission rate of less than 3.0 g/m2-day, wherein the barrier layer includes a polyethylene terephthalate having an apparent crystal size of less than 65 angstroms. Another exemplary embodiment of such a film is a multilayer film for use as a backsheet in a photovoltaic module including: a first layer including a fluoropolymer; a second layer including a polyethylene terephthalate having an apparent crystal size of less than 65 angstroms; and a third layer including an olefinic polymer. The first layer and the third layer are bonded to opposing major surfaces of the second layer.

主权项

1. A multilayer film for use as a backsheet in a photovoltaic module, comprising:
a first layer including a fluoropolymer; a second layer including a polyethylene terephthalate having an apparent crystal size of less than about 65 angstroms; and a third layer including a polymer, wherein the first layer and the third layer are bonded to opposing major surfaces of the second layer; wherein the polyethylene terephthalate in the polyethylene terephthalate layer is crystallized; and wherein the polyethylene terephthalate layer shrinks less than 1.5% of its total length in either planar direction when exposed to a temperature of 150° C. during a period of 15 minutes.