Process for the preparation of an aryl mono-, di-, and/or polyurethane
AssigneeBASF SE
InventorsFranz Merger, Friedrich Towae, Wolfgang Harder
Life of this patent
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Abstract
A process for the preparation of an aryl mono-, di-, and/or polyurethane comprising the steps of A. reacting a primary aromatic mono-, di-, and/or polyamine with an O-alkyl carbamate in the presence of an alcohol at temperatures greater than 160.degree. C., and B. separating the ammonia and other by-products from the aryl mono-, di-, and/or polyurethane. The reaction is preferably carried out in the presence of urea. The aryl mono-, di-, and/or polyurethanes produced are valuable end and intermediate products. They can be transferred into the corresponding isocyanates which can then be used for the preparation of polyurethanes.
Claims12
A process for the preparation of an aryl mono-, di-, and/or polyurethane comprising the steps of
- A. reacting a primary aromatic mono-, di- and/or polyamine with a carbamate of the formula H.sub.2 N-COOR in which R represents an unsubstituted or substituted aliphatic, cycloaliphatic or aromatic-aliphatic radical in the presence of an alcohol at temperatures greater than 160.degree. C., and
- B. separating the ammonia and other by-products from the aryl mono-, di-, and/or polyurethane.
A process for the preparation of an aryl mono-, di-, and/or polyurethane comprising reacting a primary aromatic amine with an unsubstituted carbamic acid ester in the presence of an alcohol and an urea at a temperature of greater than 160.degree. C.
A process for the preparation of an aryl mono-, di-, and/or polyurethane which comprises reacting a primary aromatic mono-, di-, and/or polyamine with an unsubstituted carbamic acid ester in the presence of an alcohol at temperatures greater than 160.degree. C.
Dependencies are inferred from the claim text.