POLYESTER FILM FOR OPTICAL APPLICATION

摘要

PURPOSE: A polyester film for optical application is to provide a polyurethane coating layer and acryl coating layer for the improvement in adhesive force between layers. CONSTITUTION: A polyester film for optical application comprises a polyester film, polyurethane resin coating layer, and acryl resin coating layer. The polyester film has the refractive index of 1.6 ~ 1.7. The polyurethane resin coating layer is formed on the one side of the polyester film. The acryl resin coating layer is formed on the other side of the polyurethane resin coating layer. The refractive index difference between the polyester film and each coating layer is 0.05 or greater. The thickness of each coating layer is 0.3 ~ 0.1 μm. The total light transmittance of the whole film is 91% or greater.