Multi-layer films based on polyvinyl acetal with high plasticizer content
AssigneeKuraray Europe GmbH
InventorsUwe KELLER, Jan BEEKHUIZEN, Philipp LELLIG, Michael HAERTH
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Abstract
An interlayer film for laminated glazing has at least one first and at least one second layer, each layer containing plasticized polyvinyl acetal, the first layer comprising polyvinyl acetal having a polyvinyl alcohol content from 10 to 16% by weight and a plasticizer content of at least 33% by weight, wherein the interlayer film has a total plasticiser content of at least 29% by weight and, when laminated between two glass panes of 2.1 mm thickness, exhibits after at least 4 weeks aging after lamination, a second mode frequency f2 according to ISO PAS 16940 of less than 720 Hz.
Claims14
-10. (canceled)
An interlayer film for laminated glazing, comprising at least one first and at least one second layer, each of said at least one first and second layers containing plasticized polyvinyl acetal, wherein said at least one first layer comprises polyvinyl acetal having a polyvinyl alcohol content from 10 to 16% by weight, a plasticizer content of at least 33% by weight and wherein the interlayer film has a total plasticiser content of at least 29% by weight and, when laminated between two glass panes of 2.1 mm thickness, exhibits after at least 4 weeks aging at 20° C. after lamination a second mode frequency f2 according to ISO PAS 16940 of less than 720 Hz.
Dependencies are inferred from the claim text.