PROCESS FOR THE PRODUCTION OF POLYISOCYANATES HAVING A BIURET STRUCTURE

A process for the production of polyisocyanates having a biuret structure, comprising continuously combining organic diisocyanates having aromatically attached isocyanate groups in a mixing chamber with organic diamines having aromatically attached amino groups in a molar ratio of at least 8:1 to fo...

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Bibliographic Details
Main Authors WOYNAR, HELMUT, SCHMIDT, MANFRED, GR NEN, JUERGEN
Format Patent
LanguageEnglish
French
Published 26.08.1998
Edition6
Subjects
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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Summary:A process for the production of polyisocyanates having a biuret structure, comprising continuously combining organic diisocyanates having aromatically attached isocyanate groups in a mixing chamber with organic diamines having aromatically attached amino groups in a molar ratio of at least 8:1 to form a reaction mixture; and reacting said reaction mixture at a temperature of above 180.degree.C, wherein a residence time of said reaction mixture in the mixing ch amber from when said organic diisocyanates and said organic diamines are combined is at most 60 seconds.
Bibliography:Application Number: CA19982230148