A MANUFACTURING METHOD OF POLYVINYLALCOHOL FILM, A POLYVINYLALCOHOL FILM FORMED THEREFROM AND A POLARIZER HAVING THE SAME

摘要

A method for preparing a poly(vinyl alcohol)-based film, a PVA-based film prepared by the method, and a polarizer using the film are provided to prevent the problem due to the tension difference between the both interfaces of casting substrate/plasticizer layer and plasticizer/PVA film, thereby improving the processability without the damage of a PVA-based film. A method for preparing a poly(vinyl alcohol)-based film comprises the steps of dissolving a poly(vinyl alcohol)-based polymer, a plasticizer and a first nonionic surfactant and a second nonionic surfactant whose HLB difference is 3 or more in a solvent to prepare a poly(vinyl alcohol)-based polymer solution; solution casting the prepared poly(vinyl alcohol)-based polymer solution on a casting substrate; and removing the solvent from the obtained one. Preferably the first nonionic surfactant has an HLB of 1-12; and the second nonionic surfactant has an HLB of 8-20.