Polyurethane dispersions with high acid content

Details Polyurethane dispersions with high acid content Polyurethane dispersions with high acid content

C - Chemistry, Metallurgy

08

J

C08J 3/02 (2006.01) B05D 1/00 (2006.01) C08L 75/04 (2006.01) C09D 175/04 (2006.01)

Patent

CA 2510205

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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