Process for producing solid polyurethane curing agents

The present invention relates to a process for producing a solid, internally and externally blocked polyurethane curing agent based on a (cyclo)aliphatic polyisocyanate, in which, in the sequence of steps a) to d),a) i) at least one internally blocked (cyclo)aliphatic polyisocyanate andii) at least...

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Bibliographische Detailangaben
Hauptverfasser:	Spyrou, Emmanouil, Schüller, Jessika, Gollan, Elke, Henschke, Andrea, Fresmann, Nicole
Format:	Patent
Sprache:	eng
Schlagworte:	CHEMISTRY COMPOSITIONS BASED THEREON MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONSONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS METALLURGY ORGANIC MACROMOLECULAR COMPOUNDS THEIR PREPARATION OR CHEMICAL WORKING-UP
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Beschreibung
Zusammenfassung:	The present invention relates to a process for producing a solid, internally and externally blocked polyurethane curing agent based on a (cyclo)aliphatic polyisocyanate, in which, in the sequence of steps a) to d),a) i) at least one internally blocked (cyclo)aliphatic polyisocyanate andii) at least one lactam and/or at least one aliphatic alcohol are dissolved in a solvent to produce a reaction mixture,b) the reaction mixture is heated and reacted,c) the reacted reaction mixture is cooled until product precipitates, andd) liquid solvent and any unreacted dissolved reactants and precipitated product are mechanically separated from one another.