| 摘要 |
PROBLEM TO BE SOLVED: To provide a polyester film for display members and the like requiring high quality, excellent in transparency after thermal processing, having a little precipitation of a cyclic oligomer and excellent in heat resistance and durability.SOLUTION: The polyester film is formed of a polyethylene terephthalate resin. The intrinsic viscosity of the polyethylene terephthalate resin is 0.60 dl/g or more, and a ratio WCy3/WCy4 of the weight fraction (WCy3) of a cyclic trimer oligomer to the weight fraction (WCy4) of a cyclic tetramer oligomer in the film is 5 or less. |
