| 摘要 |
Diphenylmethane dicarbamates and polymethylene polyphenyl carbamate homologs and derivatives of these compounds are produced by the acid catalyzed condensation of an N-aryl carbamic acid ester, such as ethylphenylcarbamate, with a carbonyl compound, such as formaldehyde, at a reaction temperature of from about 30 DEG C. to 170 DEG C. while removing any water added with the reactants and the water of condensation formed in the reaction, by azeotropic distillation with an azeotroping solvent which is non-reactive with the reactants and products of the condensation and which form a binary minimum-boiling azeotrope with water within the condensation, temperature range at atmospheric, sub-atmospheric or super-atmospheric pressure.
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