Abstract
AbstractTo ensure more comfort, dosage units of active ingredients may be packed in water soluble film prior to application. In the mean time plasticised polyvinylalcohol (PVAL), with limited metabolitic degradability in common water epuration units, is used for present purpose. In this work we found that the reducing chain ends of degraded starch molecules form semi acetals with the hydroxyl moieties of (PVAL). Reaction conditions could be selected for processing in a twin screw extruder. Due to replacement of around 50% of the polyvinylalcohol by starch the production costs are significantly lower than that of pure PVAL‐films. The acetal films show better mechanical properties, seal easier, dissolve faster in water and mineralise at lower temperatures if compared with pure PVAL.
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