Aqueous polyurethane compositions

An aqueous polyurethane composition comprising a polyurethane which is the reaction product of: (A) an isocyanate-terminated prepolymer and (B) at least one active-hydrogen chain-extending compound comprising at least 0.20 stoichiometric equivalents with respect to the isocyanate content of the isoc...

Ausführliche Beschreibung

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Bibliographische Detailangaben
Hauptverfasser: Steenwinkel, Pablo, Goos, Andreas Jacobus Josine, Hönen, Paulus Johannes Maria, Overbeek, Gerardus Cornelis
Format: Patent
Sprache:eng
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Beschreibung
Zusammenfassung:An aqueous polyurethane composition comprising a polyurethane which is the reaction product of: (A) an isocyanate-terminated prepolymer and (B) at least one active-hydrogen chain-extending compound comprising at least 0.20 stoichiometric equivalents with respect to the isocyanate content of the isocyanate-terminated prepolymer (A), of an active-hydrogen chain-extending compound selected from the group consisting of hydrazine, hydrazine derivatives and mixtures thereof; and wherein at least 0.2 stoichiometric equivalents of the anionic or potentially anionic water-dispersing groups are neutralised with ammonia.