Patent ID: 10471755

Abstract:
A polyester film constituted of a polyester resin which has an intrinsic viscosity (IV value) of 0.640-0.700, wherein the polyester resin constituting the polyester film contains a P element and further contains at least one element selected from among Mn, Mg, Ca, K, and Na elements, and when the content of the P element in the whole polyester resin is expressed by P (mol/t) and the total content of the Mn, Mg, Ca, K, and Na elements is expressed by M (mol/t), then the following relationships (1) and (2) are satisfied: 1.00≤M−P≤2.50  (1)1.60≤M/P≤4.00  (2)A polyester film satisfactory in terms of local heat resistance, printing sensitivity, processability, and manufacturability is provided.