Ideas for New Uses of HMMM (Disclaimer please read it)
Improved Chemical Resistance (Acid Etch)
There is a lot of activity in replacing the conventional hydroxyl functional polymers which produces with HMMM crosslinking an acid sensitive ether bond with a more stable linkage. Functional groups such as carbamate, phenol and urea are being patented as potential sites with improved acid resistance. The secondary carbamate group of a urethane linkage is also reactive with HMMM, although the reaction rate is slower and self condensation is a major side reaction. A resin with only urethane groups in its backbone produces excellent acid resistance and exterior durability. 
Alkylated melamine formaldehyde resins are used as crosslinker in  high solids and waterborne coatings. 


Electrocoating Amino Cross-Linking Agents in Anodic Electrocoating Paints
Electrocoating Turnover of Amino-Cross-linked Electrocoating Paints
Waterborne coatings Amino-Cross-linking Agents in Water Based Coatings
Mechanism Reaction Mechanism of Amino Resins
Low VOC coating Cross-linking Agents for High Solids and Water-Borne Coatings
High Solids Amino Resins in High Solids Coatings
Review Urea, Benzoguanamine, and Melamine Resins
Improved Chemical Resistance Melamine Formaldehyde Networks 
Blocked Isocyanates Malonate Blocked Isocyanates and with Melamine Resin
Low VOC coating High Solids Methylated Urea-Formaldehyde Coating
Electrocoating Cross-Linking Agent and their Use in Electrophoretic Coating
Electrocoating Composition with Butylated Melamine Resin

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