Multilayer interlayer film with improved optical and sound insulation properties

摘要

Disclosed are multilayer interlayers having good acoustic properties, including one or more hard skin layers and one or more soft core layers. The multilayer interlayer film includes: a first polymer layer (skin layer) containing a plasticized poly (vinyl acetal) resin; a second polymer layer (core layer) containing a plasticized poly (vinyl acetal) resin; One plasticizer is a high refractive index plasticizer. The multilayer interlayer film has low color spots and resists the formation of color spots. [Selection figure] None