The Journal of Coatings Technology, January 1st, 1992
Acid catalyzed self-condensation reactions and NMR
spectra of three model compounds for methylolated
melamine-formaldehyde resins were studied. The
model compounds had a single --N(H) [CH.sub.2] [OCH.sub.3]
dyad, a single --N([[CH.sub.2] [OCH.sub.3]).sub.2] dyad, and three
--N([[CH.sub.2] [OCH.sub.3]).sub.2] dyads. Evidence from model
compound studies indicates that: (1) All self-condensation
reactions are reversible. (2) Acyclic methylene
bridges from readily from --N(H) [CH.sub.2] [OCH.sub.3] dyads
and from all dyads in the presence of water, but are
unstable. (3) Methylene bridg...
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