Manufacture of polymer dispersions
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United States of America Patent
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Feb 28, 1984
Grant Date -
N/A
app pub date -
Mar 8, 1982
filing date -
Mar 19, 1981
priority date (Note) -
Expired
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Abstract
Stable dispersions of halogen-containing addition polymers, such as polyvinylidene fluoride, in water-dilutable liquid media, for example 2-butoxyethanol, are produced by dispersing pre-formed particles of the polymer, of a number-average size in the range 0.1-10 microns, in the liquid medium in the presence of a polymeric dispersant containing in the molecule a hydrophobic polymer chain and strongly ionized groups, in particular quaternary ammonium groups, the strongly ionized groups being present in such a proportion as to provide a charge density of from 0.05 to 6.0 milliequivalents per gram of the total dispersant. The dispersions thus obtained are valuable as a basis for water-borne coating compositions.
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