HYDROLYSIS RESISTANT POLYESTER FILMS

摘要

A biaxially oriented polyester film comprising polyethylene terephthalate (PET) and at least one hydrolysis stabiliser selected from a glycidyl ester of a branched monocarboxylic acid, wherein the monocarboxylic acid has from 5 to 50 carbon atoms, wherein said hydrolysis stabiliser is present in the film in the form of its reaction product with at least some of the end-groups of said polyester; a process for making the same; and use of the film as a layer in a photovoltaic cell.