Polyester film, release film, and method for producing polyester film

Abstract

The object of the present invention is to provide a polyester film for the manufacture of a release film, which can suppress the formation of transfer marks on the surface of the release layer and has excellent conveyability and coating properties of the release layer. Furthermore, the object of the present invention is to provide a method for manufacturing a release film and a polyester film. The polyester film of the present invention is a polyester film for the manufacture of a release film, which comprises: a polyester substrate substantially free of particles; and a coating layer containing particles arranged on one surface of the polyester substrate, and has a first main surface and a second main surface, and a release layer is formed on the first main surface for the manufacture of a release film, in which the second main surface is the surface of the coating layer on the side opposite to the polyester substrate side, the maximum protrusion height Sp of the second main surface is greater than 1 nm and less than 60 nm, and the surface free energy of the second main surface is 25 to 60 mJ / m 2 .

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