Process to produce polyvinyl-ester compositions with low residual monomer and the use thereof
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United States of America Patent
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Oct 13, 2020
Grant Date -
Dec 3, 2015
app pub date -
Dec 3, 2013
filing date -
Dec 5, 2012
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Abstract
A process for reducing the amount of residual monomer in aqueous polymerization emulsion by using a sequential polymerization steps, The first step consists in adding an emulsion, of vinyl ester of alkyl of C1 to C18 carboxylic acids, to water containing a radical initiator, the second step consists in adding further an emulsion of alkyl acrylate and/or methacrylate, and the third step consists in c) adding to polymeric emulsion, resulting of the steps a) and b), pure liquid acrylate or methacrylate with alkyl chain of C1 to C12.
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