PROCESS FOR THE PRODUCTION OF POLYISOCYANATES OF THE DIPHENYLMETHANE SERIES WITH A REDUCED COLOR VALUE

A method for the production of polyamines of the diphenylmethane series involves acid-catalyzed reaction of aniline with formaldehyde. The reaction mixture is neutralized with a base at above 110 degrees C, or heated to above 110 degrees C after neutralization with a base. An Independent claim is al...

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Hauptverfasser:	DANIEL KOCH, TORSTEN HAGEN, HEINZ-HERBERT MULLER, FRIEDHELM KAMPER
Format:	Patent
Sprache:	eng
Schlagworte:	ACYCLIC OR CARBOCYCLIC COMPOUNDS CHEMISTRY COMPOSITIONS BASED THEREON MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONSONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS METALLURGY ORGANIC CHEMISTRY ORGANIC MACROMOLECULAR COMPOUNDS THEIR PREPARATION OR CHEMICAL WORKING-UP
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Beschreibung
Zusammenfassung:	A method for the production of polyamines of the diphenylmethane series involves acid-catalyzed reaction of aniline with formaldehyde. The reaction mixture is neutralized with a base at above 110 degrees C, or heated to above 110 degrees C after neutralization with a base. An Independent claim is also included for a method for the production of polyisocyanates of the diphenylmethane series, by phosgenation of the polyamines obtained by the new method.