Multilayered film and photovoltaic module including the same

摘要

A multilayered film, a back sheet for a photovoltaic cell, methods of manufacturing the film and cell, and a photovoltaic module including the film and cell are provided. The multilayered film includes a resin layer formed on a substrate, and the resin layer contains a fluorine-based polymer and a reactive functional group having an equivalent weight of 30,000 or less. The resin layer containing the fluorine-based polymer has good durability and weatherability and is highly adhesive to the substrate at an interface between the resin layer and the substrate. Also, since a drying process may be performed at a low temperature during manufacture of the multilayered film, manufacturing costs may be reduced, productivity may be increased, and degradation in the quality of products due to thermal deformation or thermal shock may be prevented. The multilayered film may be effectively used as, for example, a back sheet for various photovoltaic modules.

主权项

1. A multilayered film comprising:
a substrate; and a resin layer directly disposed on the substrate and including a fluorine-based polymer and an acrylic polymer containing a reactive functional group, wherein an equivalent weight of the reactive functional group with respect to a mixture of the fluorine-based polymer and the acrylic polymer of the resin layer is 2,000 to 20,000, wherein the acrylic polymer has a weight-average molecular weight of a hundred thousand to five million, and wherein the acrylic polymer is contained at a content of 2 to 30% by weight in the mixture of the fluorine-based polymer and the acrylic polymer containing the reactive functional group, which are included in the resin layer.