Biologically degradable film

A single-layer film, wherein the single-layer film comprises:

• 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 component B is selected from the group consisting of thermoplastic aliphatic copolyesters and mixtures thereof,
• wherein the film has a total thickness of 1 to 200 μm, and
• wherein the film is free of starch,
• wherein
• the component B is selected from the group consisting of poly(3-hydroxybutyrate-co-3-hydroxyvalerate), poly(3-hydroxybutyrate-co-3-hexanoate), poly(butylene adipate-co-succinate), and mixtures thereof, the poly(butylene adipate-co-succinate) having a number-average molecular weight of 50,000 to 500,000 g/mol;
• and
• wherein
• the film comprises 0.1 to 30 wt. % poly(butylene adipate-co-terephthalate), based on the total weight;
• or
• the film comprises 0.1 to 30 wt. % poly(butylene sebacate-co-terephthalate), based on the total weight.