The present invention relates to a process to prepare ethyleneamines of the formula NH.sub.2(C.sub.2H.sub.4NH).sub.pH wherein p is at least 3 or derivatives thereof wherein one or more units NHC.sub.2H.sub.4NH may be present as a cyclic ethylene urea unit or between two units NHC.sub.2H.sub.4NH a carbonyl moiety is present, by reacting an ethanolamine-functional compound, an amine-functional compound in the presence of a carbon oxide delivering agent, wherein the molar ratio of ethanolamine-functional compound to amine-functional compound is at least 0.7:1 and the molar ratio of carbon oxide delivering agent to amine-functional compound is at least 0.05:1.

The present invention provides a process for preparing radiation-curing allophanates having residual monomer contents of less than 0.5% by weight and an NCO content of less than 1% by weight, wherein (A) compounds containing isocyanate groups, (B) hydroxy-functional compounds which contain groups which react, with polymerization, with ethylenically unsaturated compounds on exposure to actinic radiation (radiation-curing groups) and (C) optionally further compounds containing NCO-reactive groups, also optionally in the presence of a catalyst, are used to form NCO-group-containing urethanes having radiation-curing groups, which are subsequently reacted, without further addition of compounds containing isocyanate groups, in the presence of an allophanatization catalyst, the ratio of NCO groups of the compounds from A) to the OH groups of the compounds from B) and, where used, C) being 1.45:1.0 to 1.1:1.0.

A method for producing an alkylamine derivative having a urea bond represented by formula (I), or a salt thereof, comprises the following steps (a) and (b), step (a):

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and step (b): deprotecting as necessary the reaction product obtained in step (a). The production method suitable for industrialization of the alkylamine derivative having a urea bond represented by formula (I), which is a compound highly useful as an agent having CaSR agonist effects is provided.

A method for producing a carbamic acid salt, including contacting a carbon dioxide-containing mixed gas having a partial pressure of carbon dioxide of 0.001 atm or more and less than 1 atm with an amino group-containing organic compound in the presence of a base in at least one organic solvent selected from the group consisting of an organic solvent having 2 or more and 8 or less carbon atoms, and a method for producing a carbamic acid ester or a urea derivative using the carbamic acid salt.