FIELD: chemistry; construction.
SUBSTANCE: invention relates to multilayer polymer materials for use in safe glazing. High-strength film multilayer material is formed from at least three layers A, B and C, containing at least one plasticiser and at least one polyvinyl acetal. At least one layer A, B or C as polyvinyl acetal contains at least one polyvinyl(iso)acetal with average polymerisation degree less than 3,000, with content of polyvinyl alcohol groups 10-25 wt% and content of polyvinyl(iso)acetal groups 50-80 wt%, and layer B has content of plasticise less than 32 wt%.
EFFECT: invention provides creation of multilayer films with improved mechanical properties which, due to selection of polyvinyl acetal, have high plasticiser compatibility.
13 cl, 3 tbl, 4 ex
