Aqueous dispersions containing multi-stage emulsion polymers
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United States of America Patent
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Oct 23, 2007
Grant Date -
May 19, 2005
app pub date -
Nov 13, 2003
filing date -
Nov 13, 2003
priority date (Note) -
Expired
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Abstract
Aqueous dispersions are disclosed, having a minimum film formation temperature no greater than about 50.degree. C., that include a multi-stage emulsion polymer made by a process that includes a first polymerization stage, in which a first monomer mixture having a calculated glass transition temperature of at least about 50.degree. C. is polymerized via free radical emulsion polymerization to obtain a first-stage emulsion polymer, and a second polymerization stage, in which a second monomer mixture, having a calculated glass transition temperature from about -30.degree. C. to about 10.degree. C., is polymerized via free radical emulsion polymerization, in the presence of the first-stage emulsion polymer. The dispersions are useful in a variety of coating compositions that exhibit improved block resistance.
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