PRODUCTION OF METHYLENE-CROSSLIKED POLYPHENYLENE POLYISOCYANATE

PURPOSE:To provide a process for the production of a methylene-crosslinked polyphenylene polyisocyanate having low acid and hydrolyzable chlorine contents and excellent hue. CONSTITUTION:A methylene-crosslinked polyphenylene polyisocyanate is produced by condensing aniline with formaldehyde and reac...

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Bibliographische Detailangaben
Hauptverfasser:	MIYATA KATSUJI, ISHIDA NORITOSHI, SHIMAMATSU MITSUNORI, KURODA KAZUMOTO
Format:	Patent
Sprache:	eng
Schlagworte:	ACYCLIC OR CARBOCYCLIC COMPOUNDS APPARATUS THEREFOR CHEMISTRY COMPOSITIONS BASED THEREON GENERAL METHODS OF ORGANIC CHEMISTRY 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:	PURPOSE:To provide a process for the production of a methylene-crosslinked polyphenylene polyisocyanate having low acid and hydrolyzable chlorine contents and excellent hue. CONSTITUTION:A methylene-crosslinked polyphenylene polyisocyanate is produced by condensing aniline with formaldehyde and reacting the produced polyamine mixture with phosgene in an inert solvent in the presence of an acid catalyst. In the above process, the phosgenation is carried out at