BIAXIALLY ORIENTED POLYESTER FILM FOR MULTIPURPOSE AND PROCESS FOR PRODUCING THE SAME

摘要

PURPOSE: A biaxially stretched polyester film is provided to have excellent adhesion at post-processing process and adhesion to a substrate after coating primer layer, and to maintain excellent transparency while improving traversability. CONSTITUTION: A biaxially stretched polyester film comprises a biaxial stretched polyester film as a substrate of which thickness is 100-250 micron and not includes inorganic particles. In one side or both sides of the biaxially stretched polyester film, a primer layer is formed as a polymer adhesive layer. The polymer primer layer uses a polyurethane resin which contains branched monomers as compositional components, and contains silica particle of which average particle diameter is 80-140 nm, or composite oxide particle of which alumina-silica composite oxide.