Stable aqueous dispersion of particle polymers containing structural units of 2-(methacryloyloxy)ethyl phosphonic acid and composites thereof
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United States of America Patent
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Oct 11, 2016
Grant Date -
Nov 5, 2015
app pub date -
Nov 26, 2013
filing date -
Dec 5, 2012
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Abstract
The present invention is a composition comprising a stable aqueous dispersion of polymer particles comprising structural units of a nonionic monoethylenically unsaturated monomer; 2-(methacryloyloxy)ethyl phosphonic acid (MEP) or a salt thereof; and a sulfur acid monomer or carboxylic acid monomer or a combination thereof or a salt thereof, as well as a composite comprising the polymer particles adsorbed to the surface of a pigment particle such as TiO2. The composition and composite are prepared using the phosphorus acid monomer MEP, which can be prepared in high purity with low residual non-polymerizable phosphorus acid, thereby reducing the load of neutralizing agent required to achieve the targeted pH as compared with phophoethyl methacrylate (PEM).
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