The dependence of processing parameters of the reaction between diethylenetriamine (DETA) and crotonaldehyde (CR) or cinnamaldehyde (CA) on reaction time were followed by calorimetric and viscosity measurements. Resins with molecular weights up to 800 g/mol and content of unreacted monomers under 1% were formed. The most reactive were the amino and aldehyde groups. The aldehyde groups are five times more reactive than double bonds. -NHCHOH, -CH2NH-, -CHNH-, and -N=CH- groups were formed. The rates of the reactions and the rate constants decrease with increasing molar ratio between DETA and unsaturated aldehydes. The heat of the addition of DETA to CR was up to 54 KJ/mol and the total heat of reaction was up to 71 KJ/mol. The heat of addition of DETA to CA was up to 32 KJ/mol and the total heat of reaction was up to 61 KJ/mol. For DETA and CR the activation energy of condensation were 57.3 KJ/mol, and 42.0 KJ/mol for DETA and CA. The viscosity of the final products increased up to hard resins.