Polyurethane dispersions with high acid content
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United States of America Patent
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Issued Date -
Dec 29, 2005
app pub date -
Jun 25, 2004
filing date -
Jun 25, 2004
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
A polyurethane dispersion prepared by: A) forming an isocyanate functional prepolymer containing acid functional groups by reacting a first polyol, a second polyol having carboxylic acid functionality and a polyisocyanate; and optionally B) reacting an amino acid with the prepolymer. The dispersion is used in coating compositions that include (i) the above-described polyurethane dispersion and (ii) a cross-linking agent for the polyurethane which does not contain free isocyanate groups. The coating composition is used to coat substrates by: (a) mixing components (i) and (ii); and (b) applying the mixture to a surface of the substrate.
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