Film containing 10 to 50 wt.% of a component A and 50 to 90 wt.% of a component B, based on the sum of the components A and B, wherein component A is selected from the group consisting of polymers that are obtainable from ring-opening polymerization and have a glass transition temperature (Tg) lower than -30°C, wherein the glass transition temperature is the mid-point temperature T mg of the stage of the second heating step in the DSC diagram and the measurement was carried out with heating and cooling rates of 10°C/min in each case and with an equilibration time at the temperature end points of 2 minutes in each case and component B is selected from the group consisting of thermoplastic aliphatic copolyesters and mixtures thereof, wherein the film is formed as a single-layer film, wherein the film has a total thickness of 1 to 200 μm and at least one of the following mechanical properties: - tensile strength in the dry state in the extrusion direction of at least 15 MPa according to EN ISO 527; - tensile strength in the dry state transversely to the extrusion direction of at least 15 MPa according to EN ISO 527; - elongation at tear in the dry state in the extrusion direction of at least 100% according to EN ISO 527; - elongation at tear in the dry state transversely to the extrusion direction of at least 100% according to EN ISO 527; and wherein after introduction into salt water for a period of 12 weeks under controlled test conditions, according to the method ASTM D6691-09, and after sieving through a sieve having a mesh size of 2.0 mm, the film has a maximum of 30 wt.% of the original dry weight, and/or wherein after introduction into salt water, at least 30% of the organic carbon of the film is converted to carbon dioxide within 180 days at a temperature of 30 ± 2°C, according to the method ASTM D6691-09. wherein component A is selected from the group consisting of polymers that are obtainable from ring-opening polymerization and have a glass transition temperature (Tg) lower than -30°C, wherein the glass transition temperature is the mid-point temperature T mg of the stage of the second heating step in the DSC diagram and the measurement was carried out with heating and cooling rates of 10°C/min in each case and with an equilibration time at the temperature end points of 2 minutes in each case and component B is selected from the group consisting of thermoplastic aliphatic copolyesters and mixtures thereof, wherein the film is formed as a single-layer film, wherein the film has a total thickness of 1 to 200 μm and at least one of the following mechanical properties: - tensile strength in the dry state in the extrusion direction of at least 15 MPa according to EN ISO 527; - tensile strength in the dry state transversely to the extrusion direction of at least 15 MPa according to EN ISO 527; - elongation at tear in the dry state in the extrusion direction of at least 100% according to EN ISO 527; - elongation at tear in the dry state transversely to the extrusion direction of at least 100% according to EN ISO 527; - tensile strength in the dry state in the extrusion direction of at least 15 MPa according to EN ISO 527; - tensile strength in the dry state transversely to the extrusion direction of at least 15 MPa according to EN ISO 527; - elongation at tear in the dry state in the extrusion direction of at least 100% according to EN ISO 527; - elongation at tear in the dry state transversely to the extrusion direction of at least 100% according to EN ISO 527; and wherein after introduction into salt water for a period of 12 weeks under controlled test conditions, according to the method ASTM D6691-09, and after sieving through a sieve having a mesh size of 2.0 mm, the film has a maximum of 30 wt.% of the original dry weight, and/or wherein after introduction into salt water, at least 30% of the organic carbon of the film is converted to carbon dioxide within 180 days at a temperature of 30 ± 2°C, according to the method ASTM D6691-09.