MULTI-LAYER FOILS COMPRISING PLASTICIZED POLYVINYL ACETAL, FEATURING PENETRATION RESISTANCE AND SOUND-DAMPING PROPERTIES
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United States of America Patent
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Oct 29, 2015
app pub date -
Nov 13, 2013
filing date -
Nov 16, 2012
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Abstract
The invention relates to an intermediate layer film for laminated glazing, constructed from at least one first and at least one second sub-film containing plasticiser-containing polyvinyl acetal each with different plasticiser content, wherein the first sub-film consists of plasticiser-containing polyvinyl acetal with a polyvinyl alcohol content from 17 to 22% by weight, and the second sub-film consists of plasticiser-containing polyvinyl acetal with a polyvinyl alcohol content from 11 to 14% by weight, and the intermediate layer film has a total plasticiser content of less than 28% by weight. The film can be used in particular for windscreens with use of glasses with a total thickness of less than 3.7 mm.
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