POLYESTER FILM HAVING PRIMER LAYER AND PROCESS FOR PRODUCING THE SAME

摘要

PURPOSE: Provided is a polyester film having a primer layer, which is excellent in adhesive strength to an aqueous resin such as an ink aqueous layer of an inkjet film and a subbing layer of a photo film. CONSTITUTION: The polyester film comprises: a polyester base film layer; the primer layer comprising a polyester of which the both ends are blocked by isocyanate groups and an epoxy silane in the weight ratio of 50:1-1:1, which is formed on one or both sides of the base film layer, wherein the thickness of the primer layer is 0.001-1 micrometer. Additionally, the primer layer contains 4-18wt. (based on the total weight of the primer layer) of colloidal silica having a particle size of 50-200nm and 0.4-18wt. (based on the total weight of the primer layer) of an anionic surfactant.