Abstract: A central aspect of the present invention relates to a film of biodegradable material plasticized with a plasticizer of low vapour pressure, the film comprising on one or both surfaces a coating of glass or metal. Hereby a dilemma is solved: Glass and metal can only be vapour-deposited on polymers that do not contain plasticizers, as the plasticizer evaporates during the vacuum process. By selecting plasticizers with a low vapour pressure, the problems due to evaporation are solved.

Abstract: The present invention discloses the construction of a biodegradable film that has barrier towards faeces odour and with no cracking sounds. This is obtained through using a substantially exfoliated silicate filler material, which is applied with water (evaporating under mild conditions) such that the softener of the biodegradable material can be maintained in the film.