MULTILAYER FILM COMPRISING LAYER OF PLASTICIZED POLYVINYL ACETAL WITH REDUCED FLOWABILITY
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United States of America Patent
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May 23, 2019
app pub date -
Apr 5, 2017
filing date -
Apr 5, 2017
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Abstract
A multilayer laminating film contains at least one first and one second layer of plasticized polyvinyl acetal, wherein the first layer comprises a first plasticizer and a first polyvinyl acetal with a degree of acetalization of 75.1-84.0 mol % and a molar ratio of continuous sequences of vinyl alcohol groups with 5 members with a stereochemical sequence of rrrr of more than 0.23 based on the total amount of continuous syndiotactic sequences of vinyl alcohol groups with 3 members in the polyvinyl acetal, and the second layer comprises a second plasticizer and a second polyvinyl acetal with a degree of acetalization of 60-84 mol %.
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