Aliphatic polyester film and gas barrier film

摘要

A film of the present invention includes, as its main component, an aliphatic polyester whose primary repeating unit is represented by a general formula -O-CHR-CO- (where R denotes H or an alkyl group having a carbon number of 1-3). A three-dimensional surface roughness SRa of at least one side of the film is about 0.01 µm to about 0.1 µm. PCC value denoting the number of projections on the film per a unit of area along a mean roughness plane and the three-dimensional surface roughness SRa satisfy the following relationship: PCC value ‰ 7000-45000×SRa.