| 摘要 |
N-substituted aspartic acid monoesters of the formula I <IMAGE> (I) wherein for example R1 is an alkyl group having 1 to 12 C atoms, cyclohexyl, phenyl, tolyl or benzyl, x is 2 or 3, R2 and R3 are each a methyl or ethyl group, or together with the N atom they form an N-heterocyclic ring, are obtained by adding, by means of an addition reaction, to 1 mol of a maleic acid monoester of the formula II <IMAGE> (II) 1 mol of an amine of the formula III <IMAGE> (III) in the presence of a tertiary amine. The novel N-substituted aspartic acid monoesters are valuable curing accelerators for epoxide resin mixtures containing dicyandiamide or a polycarboxylic acid anhydride as curing agent. They are also suitable alone as catalytically acting curing agents for epoxide resins.
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