PROCESS FOR PREPARING CARBODIIMIDES

The invention relates to a new process for the preparation of carbodiimides comprising the steps of a) carbodiimidisating isocyanates in the presence of a catalyst, b) separating the catalyst and/or monomeric isocyanate from the carbodiimide by distillation or extraction in order to obtain a crude c...

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Bibliographic Details
Main Author LAUFER, WILHELM
Format Patent
LanguageEnglish
French
Published 27.10.2022
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:The invention relates to a new process for the preparation of carbodiimides comprising the steps of a) carbodiimidisating isocyanates in the presence of a catalyst, b) separating the catalyst and/or monomeric isocyanate from the carbodiimide by distillation or extraction in order to obtain a crude carbodiimide containing monomeric isocyanate, c) adding one or more alcohols and partial or complete reaction of the alcohol with the monomeric isocyanate of the crude carbodiimide. L'invention concerne un nouveau procédé de préparation de carbodiimides comprenant les étapes consistant à a) mettre en oeuvre une carbodiimidisation des isocyanates en présence d'un catalyseur, b) séparer le catalyseur et/ou l'isocyanate monomère du carbodiimide par distillation ou extraction, afin d'obtenir un carbodiimide brut contenant un isocyanate monomère, c) ajouter un ou plusieurs alcools et mettre en réaction partielle ou complète l'alcool avec l'isocyanate monomère du carbodiimide brut.
Bibliography:Application Number: CA20223216684