| abstract |
A polyester film including a cyclic carbodiimide compound represented by the following Formula (O-1) has good film thickness uniformity without increase in viscosity. R 1 and R 5 represent an alkyl group, an aryl group, or an alkoxy group; R 2 to R 4 and R 6 to R 8 represent a hydrogen atom, an alkyl group, an aryl group, or an alkoxy group; X 1 and X 2 represent a single bond, —O—, —CO—, —S—, —SO 2 —, —NH—, or —CH 2 —; and L 1 represents a divalent linking group. |