Polyvinyl(iso)acetal film containing softeners

摘要

Film comprises a mixture of: at least one non-aromatic plasticizer having a polarity, expressed by the formula (100x O/ (C+H)), of = 9.4, where O, C and H are number of oxygen, carbon and hydrogen atoms in the plasticizer molecule, respectively; and a polyvinyl (iso)acetal having a proportion of polyvinyl (iso)acetal groups of 60-85 wt.% and a proportion of polyvinyl alcohol groups of 14-40 wt.%.