Cross-linked aqueous polyurethane dispersions containing dimer/trimer
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United States of America Patent
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Dec 12, 2000
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N/A
app pub date -
Jan 23, 1995
filing date -
Jun 24, 1994
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Abstract
The present invention relates to a composition being an aqueous dispersion of a polyurethane in water, said composition comprising water and the reaction product of (a) a water-dispersible isocyanate-terminated polyurethane prepolymer having an NCO content of between 2.1 and 10% by weight, (b) an organic polyisocyanate adduct mixture comprising a polyisocyanate dimer and a polyisocyanate trimer and having an average isocyanate functionality of between 2.1 and 4.0, and (c) an amine chain extender having a specified ratio of NH2 relative to the NCO index of the polyisocyanate adduct mixture. Also disclosed is a process for preparing this composition, and a method for coating a substrate with the composition.
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