TECHNOLOGY FOCUS - POLYMERS - Preferred Components: The first layer comprises: at least one first plasticizer and a first polyvinyl (iso)acetal with the proportion of polyvinyl (iso)acetal groups of (50-80 wt.%) and the content of polyvinyl alcohol groups of (10-25 wt.%); at least one first plasticizer and a first polyvinyl (n) acetal with the proportion of polyvinyl alcohol groups of (10-25 wt.%); or a third plasticizer and a second polyvinyl (iso)acetal with the proportion of polyvinyl (iso)acetal groups of (50-80 wt.%) and the content of polyvinyl alcohol groups of (10-25 wt.%). The second layer comprises: at least one plasticizer and a second polyvinyl (n) acetal with the proportion of polyvinyl alcohol groups of (10-25wt.%); at least one second plasticizer and polyvinyl (iso)acetal with the proportion of polyvinyl (iso)acetal groups of (50-80wt.%) and the content of polyvinyl alcohol groups of (10-25 wt.%); or at least one second plasticizer and second polyvinyl (iso)acetal with the proportion of polyvinyl (iso)acetal groups of (50-80wt.%) and the content of polyvinyl alcohol groups of (10-25 wt.%). The third layer is formed as a partial film, which comprises: at least one third plasticizer and the second polyvinyl (iso)acetal with the proportion of polyvinyl (iso)acetal groups of (50-80wt.%) and the content of polyvinyl alcohol groups of (10-25 wt.%); at least one third plasticizer and the second polyvinyl (n) acetal with the proportion of polyvinyl alcohol groups of 10-25 wt.%; at least one third plasticizer and a third polyvinyl (iso)acetal with the proportion of polyvinyl (iso)acetal groups of (50-80wt.%) and the content of polyvinyl alcohol groups of (10-25 wt.%). The respective adjacent layers comprise plasticizer contents, which differ by not greater than 2 phr. The respective adjacent layers comprise polyvinyl acetals, which differ in their proportions of polyvinyl alcohol groups by not greater than 0.5 wt.%. Preferred Method: The polyvinyl (iso)acetals result from the reaction of at least one polyvinyl alcohol with at least one aliphatic keto compound with 4-10C having at least one branch at the alpha- or beta-position to the keto group. The polyvinyl (s) acetals result from the reaction of at least one polyvinyl alcohol with at least one aliphatic, unbranched keto compound with 2-10C. The film laminate is produced by co-extrusion of the layers. The film laminate is produced by folding of the layers. EXAMPLE - No suitable example given.