Cymel 254 Mixed ether melamine resin Cytec Amino Resins >> Urea based (incl. UF) Coatings >> Waterborne n-Butanol HIGH SOLIDS MIXED ETHER MELAMINE RESINS HIGH IMINO MELAMINE RESINS The high imino melamine resins in this category are similar to those in the high imino methylated melamine series in that they are partially methylolated and highly alkylated. They differ from methylated melamine resins in the type of alkylation alcohol, and they contain combinations of methoxy sites and n-butoxy sites. The butoxy sites impart improved flow and leveling and intercoat adhesion properties. As in the methylated series, their composition contains primarily alkoxy/ imino or alkoxy/NH functionality. The advantages are fast cure response at 120-150°C without the need for strong acid catalyst addition; fast cure response in waterborne formulations; high film hardness; and low formaldehyde release on cure. In addition to reacting with hydroxyl, carboxyl and amide functional polymers, the resins also self-condense readily. Therefore, their practical equivalent weight is typically 200-250. They, too, can be stabilized by amine and stabilizing alcohol addition to the formulation. CYMEL 254 Medium MW resin. Good balance of reactivity, film flex properties and humidity resistance. Medium molecular weight, high solids, partially methylolated, highly alkylated, high imino melamine resin. Contains combination of methoxy sites and n-butoxy sites. Imparts improved flow and leveling and intercoat adhesion properties. Offers fast cure response at 120-150°C without need for strong acid catalyst addition, fast cure response in waterborne formulations, high film hardness and low formaldehyde release on cure. Reacts with hydroxyl, carboxyl and amide functional polymers. Provides good balance of reactivity, film flex properties and humidity resistance.