PROCESS FOR THE PREPARATION OF POLYISOCYANATES WITH BIURET STRUCTURE

PROCESS FOR THE PREPARATION OF POLYISOCYANATES WITH BIURET STRUCTURE The present invention relates to a process for the preparation of polyisocyanates which have a biuret structure by reacting excess quantities of aliphatic diisocyanates with biuretizing agents at elevated temperature, characterized...

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Bibliographic Details
Main Authors WOYNAR, HELMUT, KOENIG, KLAUS, PEDAIN, JOSEF
Format Patent
LanguageEnglish
French
Published 10.01.1989
Edition4
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:PROCESS FOR THE PREPARATION OF POLYISOCYANATES WITH BIURET STRUCTURE The present invention relates to a process for the preparation of polyisocyanates which have a biuret structure by reacting excess quantities of aliphatic diisocyanates with biuretizing agents at elevated temperature, characterized in that the biuretizing agent contains a) .alpha.,.alpha.,.alpha.-trisubstituted acetic acids which do not contain isocyanate-reactive groups apart from the carboxyl group, and optionally b) water, wherein the molar ratio of biuretizing components a) to b) is within the range of from 1:0 to 1:2.5.
Bibliography:Application Number: CA19850472918