| http://www.w3.org/ns/prov#value | - Such a substituted nitrogen-containing compound can be prepared by subjecting the starting nitrogen-containing compound, i.e. melamine, urea and the like, to a methylolation reaction with formaldehyde in boiling water followed, if desired, by alkoxylation of the methylol groups by the reaction with a lower alcohol such as methyl, ethyl, n-propyl and isopropyl alcohols.
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