MULTI-LAYER FILMS BASED ON POLYVINYL ACETAL WITH HIGH PLASTICIZER CONTENT
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United States of America
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Feb 13, 2020
app pub date -
Oct 1, 2017
filing date -
Oct 1, 2017
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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.
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