VERFAHREN ZUR HERSTELLUNG VON ZELLIGEN POLYURETHANEN

The prodn of cellular polyurethanes (PU) comprises reacting (a) polyisocyanate(s) and/or modified polyisocyanate(s), (b) high-mol wt cpd(s) with at least two reactive H atoms, and opt (c) low-mol wt chain extenders and/or crosslinkers in the presence of (d) acetal(s) as blowing agent, (e) catalysts...

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Bibliographische Detailangaben
Hauptverfasser:	HENDREICH, REGINA, WENZEL, MARION, FALKE, PETER, TINTELNOT, DIETER
Format:	Patent
Sprache:	ger
Schlagworte:	AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F,C08G CHEMISTRY COMPOSITIONS BASED THEREON GENERAL PROCESSES OF COMPOUNDING METALLURGY ORGANIC MACROMOLECULAR COMPOUNDS THEIR PREPARATION OR CHEMICAL WORKING-UP WORKING-UP
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Beschreibung
Zusammenfassung:	The prodn of cellular polyurethanes (PU) comprises reacting (a) polyisocyanate(s) and/or modified polyisocyanate(s), (b) high-mol wt cpd(s) with at least two reactive H atoms, and opt (c) low-mol wt chain extenders and/or crosslinkers in the presence of (d) acetal(s) as blowing agent, (e) catalysts and opt (f) additives etc. Also claimed is the same process for the prodn of (i) PU mouldings with a compact surface zone and a cellular core, and (ii) flexible PU foam.