Hexamethoxymethyl melamine

These materials are effective for textile sizing imparting soft and full hand to rayon interliners. They also have uses in conjunction with hexamethoxymethyl melamine as a water soluble baking enamel. 

Chem. Desaip. Hexamethoxymethyl melamine Uses Crosslinking agent for use in paper coatings and catalyzed wood finishes... 

Chem. Descrip. Hexamethoxymethyl melamine (95%) in ethanol UN NA1993... 

If melamine is converted to methylol melamine with formaldehyde and then acidified and etherified with a very large excess of methanol, polymerization can be largely avoided and the end product is essentially hexamethoxymethyl melamine (HMMM) ... 

Hexamethylmethoxymelamine Hexamethyl methylolmelamine. See Hexamethoxymethyl melamine Hexamethylolmelamine. See Hexamethylol melamine resin... 

Waterborne poly(ester amide) resins based on dehydrated castor oil and niger seed oil have been prepared from fatty amides of oils with isophthalic acid, followed by neutralisation with varying percentages of triethylamine. The neutralised polymers were dispersed in water. These water dispersible resins were cured with hexamethoxymethyl melamine in varying proportions at a high temperature. ... 

Polymerization Chemistry. Melamine has six amine hydrogens, all of which can react readily with formaldehyde to produce methylol melamines (Fig. 3.11). For different applications, the degree of methylolation is controlled by the melamine/ formaldehyde ratio, pH, temperature, and time. Polymerization reactions are buffered at pH 8 to 10 by use of sodium earbonate or borax, and polymerization temperature 80 to 100°C. Lower pH and higher temperature produce faster reaction. Trimethylol melamine is most common, but hexamethoxymethyl melamine (HMMM) is popular for coatings, because it is more stable and soluble in organic solvents (Fig. 3.12). 

There are other methylene donors that can be used in HRH. Hexamethoxymethyl-melamine (HMMM) is the most common choice for use in HRH. However, the resulting adhesion characteristics will be different when HMMM is used in place of HMT. 

When neutralised with amine and blended with crosslinking agents such as hexamethoxymethyl melamine the following formulation is suitable for clear or pigmented stoving lacquers. 

Hexamethoxymethyl melamine (HMMM) resins are less reactive than butylated melamine resins and always require the incorporation of acid catalysts to cure the coating. Para-toluene sulphonic acid (1-2% on total resin) is used extensively in hydroxy aciylic/HMMM formulations. 

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