Some condensates of urea and formaldehyde were prepared from solutions of pH 2‐7 at temperatures of 20‐76° C. These products have been analysed with respect to their content of methylene groups, methylol groups and urea groups. The average molecular weights could be estimated. The analytical data are in harmony with the occurrence of methylene bridges between the urea fragments. The condensates will be formed by a stepwise condensation reaction. “Methylene urea” may be a mixture of condensates with an average molecular weight of 300‐500.
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Jong et al. (1953) studied this question.
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