Polyester water-based defoamer
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United States of America Patent
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Oct 15, 2002
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N/A
app pub date -
Mar 1, 2000
filing date -
Mar 1, 1999
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Abstract
Polyester water-based defoamers are prepared by reaction of a dimer fatty acid, a fatty acid and two different polyalkylene polyols, e.g. polypropylene glycol and polyethylene glycol. The resulting polyesters are readily dispersible in water to form a water-based macroemulsion in the absence of any oil or short chain alcohols. The macroemulsion is an effective defoamer in ground-wood and thermomechanical pulping operations.
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