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5966263 
Journal Article 
Urea-formaldehyde resins: 3. Formation and reactions of monourea methylol compounds during resin preparation 
Kumlin, K; Simonson, R 
1980 
0 
Die Angewandte Makromolekulare Chemie
ISSN: 0003-3146 
86 
1 
143-156 
English 
WOS:A1980JU15500010 
The content of each individual monourea methylol compound, as well as that of urea and free formaldehyde, respectively, in urea‐formaldehyde (UF) resins is given. The reaction was carried out in concentrated UF solution at elevated temperature. The influence of the pH, the F/U molar ratio, the reaction temperature, and the reaction time was studied.

To obtain a low formation of condensed products, the pH had to be kept around 8.5 during the preparation (F/U = 1.4).