Polyester membranes and separation membranes including these polyester membranes.

Abstract

Polyester film according to a design of the invention consists of a first polyester resin layer containing no particles and a second polyester resin layer lying on one side of the first polyester resin layer and containing organic particles. By achieving a predetermined surface roughness relationship, the polyester film has high smoothness along with operating and winding characteristics, thereby limiting the appearance of marks on the surface of the separation layer during the winding process of the manufactured separation film.

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