Process for preparing polyvinyl acetal by acid-catalyzed reaction
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United States of America Patent
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Apr 5, 2016
Grant Date -
Apr 10, 2014
app pub date -
Dec 11, 2013
filing date -
Dec 18, 2009
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Abstract
The invention relates to polyvinyl acetals obtainable by reacting polyvinyl alcohol with at least one aldehyde with a degree of acetalization of at least 75 mol %, characterized by an OH blockiness of the polyvinyl acetal, defined as a quotient from the number of methylene groups of two adjacent alcohol sequences (VV) and the sum of the number of methylene groups of adjacent alcohol/acetal sequences and acetal/acetal sequences (VB+BB), of more than 0.151, as well as a process for the preparation thereof.
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