Polyvinyl ester dispersions, process for preparation thereof and use thereof
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United States of America Patent
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Mar 31, 2015
Grant Date -
Feb 12, 2009
app pub date -
Jul 15, 2008
filing date -
Jul 19, 2007
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Abstract
What are described are polyvinyl ester dispersions which are prepared in a multistage process and have a low content of polymerized acids or acid anhydrides. They can be obtained by a multistage process in which a polyvinyl ester dispersion is obtained in a first stage, monomers in dissolved or pure form are added to the reaction mixture in a second stage and then the polymerization is started again. The polymer dispersions obtained in this way are notable for a low coagulum content and for increased tensile strengths of the films formed therefrom.
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