Film laminates having damping properties containing a sub-layer made of plasticizer-containing polyvinyl (iso)acetal

摘要

Film laminates are formed from at least three layers A, B and C, each containing at least one plasticizer and at least one polyvinyl acetal, wherein two outer layers A and C each contain at least one identical or different polyvinyl acetal having a proportion of polyvinyl alcohol groups of 18.5 to 23% by weight, at least one inner layer B contains a polyvinyl acetal having a proportion of polyvinyl alcohol groups of 12 to 18% by weight, and at least one of the layers A, B or C contains at least one polyvinyl (iso)acetal. The film laminates can be used for the production of glass/film laminate/glass composites for motor vehicles, aircraft, ships, architectural glazings, façade components, or for the production of photovoltaic modules.

主权项

1. A film laminate, comprising at least three layers A, B and C, each containing at least one plasticizer and at least one uncrosslinked polyvinyl acetal, wherein
two outer layers A and C each comprising at least one identical or different polyvinyl acetal having a proportion of polyvinyl alcohol groups of 18.5 to 23% by weight one or more inner layer(s) B comprising a polyvinyl acetal having a proportion of polyvinyl alcohol groups of 12 to 18% by weight, and wherein at least one of the layers A, B or C is a polyvinyl iso-acetal layer, wherein the film laminate satisfies at least one of the following conditions I and II: I. said polyvinyl acetal of layer B is polyvinyl iso-butyral and said polyvinyl acetal of layer A or C is polyvinyl n-butyral II. said polyvinyl acetal of layer B is polyvinyl n-butyral and said polyvinyl acetal of layer A or C is polyvinyl iso-butyral.