Polyester film

摘要

A polyester film having uniform surface and excellent running property and transparency is disclosed. Said polyester film is characterized by containing 0.01-5 wt% of porous precipitated silica particles which are coagulates of primary particles having an average particle diameter of 0.01-0.1 mu m and have a pore volume of 0.05-0.5 ml/g, a specific surface area of 30-150 m<2>/g and an average particle diameter of 0.1-0.5 mu m.