POLYVINYL ACETALS CONTAINING UNSATURATED ACETAL UNITS
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United States of America Patent
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Issued Date -
May 7, 2009
app pub date -
Oct 20, 2005
filing date -
Nov 4, 2004
priority date (Note) -
Abandoned
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Abstract
Polyvinyl acetals with unsaturated acetal units are obtained by means of acetalization of partly hydrolysed or fully hydrolysed vinyl ester polymers having >50 mol % of vinyl alcohol units with one or more saturated, aliphatic aldehydes and one or more unsaturated, acyclic aliphatic aldehydes, the aldehydes optionally used in the form of their hemiacetals or full acetals.
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