HYDROPHOBIC VINYL ESTER COPOLYMER DISPERSIONS
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United States of America Patent
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Jun 4, 2015
app pub date -
Jun 18, 2013
filing date -
Jun 22, 2012
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Abstract
An aqueous copolymer dispersion is obtained by emulsion polymerization of a monomer mixture comprising, as main monomers, 10 to 35 weight % of ethylene, 30 to 60 weight % of a vinyl ester of a carboxylic acid having 1 to 9 carbon atoms and 15 to 50 weight % of a vinyl ester of a branched carboxylic acid having 3 to 15 carbon atoms. The monomer mixture also contains 0.1 to 10 weight % of an ethylenically unsaturated monocarboxylic or dicarboxylic acid having 3 to 4 carbon atoms and 0.1 to 10 weight % of a methacrylic or acrylic acid ester modified with epoxide groups and/or hydroxyl groups. The dispersion is stabilized with 0.02 to 2 weight % of a protective colloid, 0.01 to 5 weight % of a non-ionic surfactant and 0.01 to 5 weight % of an anionic surfactant. All weight percentages are based on the total weight of the main monomers.
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