HIGHLY TRANSPARENT POLYESTER FILM FOR OPTICS HAVING EXCELLENT ADHESION BETWEEN POST-PROCESSED LAYERS, AND IMPROVED SURFACE STRUCTURE WHILE MAINTAINING HIGH WHOLE TRANSMITTANCE, AND A MANUFACTURING METHOD THEREOF

摘要

PURPOSE: A manufacturing method of a polyester film is provided to improve the quality of an optical film by minimizing defect due to slip and adhesion in processes, thereby manufacturing highly transparent biaxial elongated polyester film suitable for an optical base film.;CONSTITUTION: A manufacturing method of a polyester film comprises a step of inputting ethylene glycol, and terephthalic acid or dimethylene terephthalate; a step of inputting an antimony catalyst, a magnesium compound, and a phosphorous compound, and manufacturing a lyester resin(A) with the equivalent ratio of Mg^2+/P^3- of 2.0-6.5; a step of manufacturing a polyester resin(B) by inputting 30-1000 ppm of cross-linked organic particles; a step of manufacturing a sheet through coextrusion of the polyester resin A and B with the shape of B/A/B; and a step of elongating the sheet.;COPYRIGHT KIPO 2012