| abstract |
Polyvinyl-co-acetal films having a thickness of 1 μm to 1000 μm and containing less than 10 wt. % plasticizer are suitable for use as a hot melt in molding operations, exhibiting shorter cycle times as compared to conventional polyvinyl acetals. The polyvinyl-co-acetals are obtained by reacting at least one polyvinyl alcohol with at least two different aliphatic keto compounds, each containing 2 to 10 carbon atoms. |