Cymel 1141 Alkylated mixed ether melamine resin Cytec Crosslinking / Coupling / Curing Agents >> Amine >> Melamine-formaldehyde Coatings >> Waterborne Isobutanol HIGH SOLIDS MIXED ETHER MELAMINE RESINS HIGHLY ALKYLATED MELAMINE RESINS The highly alkylated melamine resins in this category a re similar to the commercial versions of hexam-ethoxymethylmelamine (HMMM), except for the type of alkylation alcohol. The resins contain combinations of methoxy sites and longer chain length alkoxy sites (ethoxy, n-butoxy or iso-butoxy). They also differ from each other in their degree of alkylation and monomer content. Longer chain length alkoxy sites impart lower viscosity, improved flow and leveling, and inter-coat adhesion properties. All of the resins in the series are efficient crosslinking agents for hydroxyl, carboxyl and amide functional polymers. The practical equivalent weight for most is 140-200. Other advantages are low VOCs; high film flexibility and toughness when used with inherently flexible backbone resins; excellent formulation stability, especially in waterborne systems at a pH of 8-9; and good mar resistance properties. Because of their high extent of alkylation, the resins in this series require the addition of a strong acid catalyst for acceptable cure response when baked at 125-150°C. Typically, 0.2-0.4% p-toluene sulfonic acid based on total binder solids is recommended. The optimum concentration of acid catalyst depends on the basicity of the other components in the formulation and should be determined experimentally. The use of a blocking amine for the acid catalyst and the addition of a stabilizing alcohol to the formulation should enhance formulation stability. CYMEL 1141 Carboxy functionality. Excellent adhesion to metals. High solids, highly alkylated mixed ether melamine resin. Contains carboxy functionality. Used as an efficient crosslinking agent for hydroxyl, carboxyl and amide functional polymers. Imparts low viscosity, improved flow and leveling and intercoat adhesion properties. Gives low VOC, high film flexibility and toughness, very good formulation stability especially in waterborne systems and good mar resistance properties. Requires addition of a strong acid catalyst. Provides very good adhesion to metals.