Cymel 3749 Partially methylated melamine resin Cytec Amino Resins >> Urea based (incl. UF) Coatings >> Solventborne Coatings >> Waterborne Isobutanol Slightly soluble in water and xylene HIGH SOLIDS METHYLATED MELAMINE RESINS PARTIALLY METHYLATED MELAMINE RESINS Partially methylated melamine resins are highly methylolated and partially alkylated. They cure well at 125-150°C without the need to add a strong acid catalyst. The acidity of most polymers used in thermoset coatings is sufficient to catalyze their reaction. Their film perf o rmance pro p e rties are similar to those of the high imino resins in the previous category. In addition to reacting with the hydroxyl, carboxyl and amide functionality of polymers they, too, can self-condense readily. Their practical equivalent weight is also 180-240. As with all melamine resins, they can be stabilized by adding amine and stabilizing alcohol to the formulation. The major limitation of these products is high formaldehyde release on baking, primarily due to their high free methylol content. CYMEL 3749 General purpose melamine resin. Fast cure. No need for strong acid catalyst. Highly methylolated, partially alkylated, high solids imino melamine resin. Used in thermoset coatings. Cures well at 125-150°C without need to add a strong acid catalyst. Offers fast cure and high film hardness. Reacts with hydroxyl, carboxyl and amide functionality on polymers. Gives high formaldehyde release on baking.