abstract |
The present invention is a film comprising polyvinyl-co-acetal, characterized in that the thickness is 1 µm to 1000 µm and has at least one plasticizer of less than 10% by weight, wherein the polyvinyl-co-acetal is at least one polyvinyl. It relates to a membrane obtained by reacting an alcohol with at least two different aliphatic keto compounds each containing 2 to 10 carbon atoms. |