Method for producing polyesterpolyols of polyvalent alcohols
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United States of America Patent
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Jul 10, 2007
Grant Date -
Sep 15, 2005
app pub date -
May 21, 2003
filing date -
May 24, 2002
priority date (Note) -
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Abstract
The invention provides a process for preparing polyester polyols of polyhydric alcohols by mono- or polyesterification of at least one carboxylic acid having at least two acid groups and/or at least one derivative of a dicarboxylic acid with polyhydric alcohols, optionally with the addition of a catalyst, while removing the water of reaction, wherein the polyhydric alcohol used has a formaldehyde acetal content of less than 500 ppm.
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