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US 11,447,447 B2Granted
Method for producing carbodiimides
AssigneeLANXESS Deutschland GmbH
InventorWilhelm Laufer
Life of this patent
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Abstract
The present disclosure provides new methods for preparing carbodiimides including steps of carbodiimidizing monomeric aromatic isocyanates in the presence of a catalyst, separating low boilers and catalyst from the reaction product in a thin-film evaporator, and distilling the residue from the thin-film evaporation in a further thin-film evaporator.
Claims11
A method for preparing monomeric aromatic carbodiimides, the method comprising:
- a) carbodiimidizing monomeric aromatic isocyanates in the presence of a catalyst,
- b) separating low boilers and catalyst from the reaction product from a) in a thin-film evaporator leaving a residue comprising monomeric carbodiimides and byproducts from the carbodiimidization, and
- c) distilling the residue from b) in a further thin-film evaporator.
Dependencies are inferred from the claim text.