New oligoetherols with 1,3,5-triazine ring were obtained from melamine-formaldehyde-butanone resins using 12 molar excess propylene oxide (with respect to the amount of introduced melamine). The resins were obtained from melamine solutions in reactive solvent obtained from simple chemical compound-methyl ethyl ketone (butan-2-one) in its reaction with 3 molar excess formaldehyde. Physical and chemical properties of obtained oligoetherols were determined and their structure was confirmed on the basis of proton magnetic resonance, infrared spectral data and MALDI-ToF mass analysis. The amount of by-products was specified on the basis of chromatographic analysis. Initial tests proved that obtained oligoetherols can constitute a potential substrate for obtaining polyurethane foams of increased thermal resistance.