Cymel UI-38-I Isobutoxymethyl methylol urea Cytec Crosslinking / Coupling / Curing Agents >> Amine Acrylic/Acrylate Resins Alkyd Resins Cellulosic Resins Polyester Vinyl Coatings >> Electrodeposition Coatings >> Solventborne Wood & Furniture Coatings Isobutanol DELIVERY FORM Viscous liquid 69% in isobutanol APPLICATION PROPERTIES In solvent borne systems CYMEL Ul-38-I resin is an isobutylated urea-formaldehyde crosslinking agent with a medium degree of alkylation, a medium methylol content and low imino functionality. CYMEL Ul-38-I resin is a very effective crosslinking agent for backbone polymers containing hydroxyl, amide and, to some extent, carboxyl functional groups such as alkyd/polyester or acrylic resins. CYMEL Ul-38-I resin is designed for use in fast curing wood coating systems, providing excellent stackability and very good chemical resistance properties. Due to its high electrostatic resistivity, CYMEL Ul-38-I resin is recommended for electrostatic spray applications. In water borne systems CYMEL Ul-38-I resin is insoluble in water and, because of its polymeric and hydrophobic nature, is not recommended in water borne systems. Catalysis CYMEL Ul-38-I resin requires weak acid catalysts for cure at normal baking schedules. The acidity of the primary film former is usually sufficient to initiate the curing process. In two-pack acid curing systems, strong acids like paratoluene sulphonic acid are recommended as the best catalysts. In one-pack acid curing finishes, weak acids with a pKa value higher than 1.9 are strongly recommended. Stability Formulated systems containing CYMEL Ul-38-I resin have to be stabilised with primary alcohols, amines or with a combination of these. Acid curing systems are usually stabilised only by addition of adequate amounts of primary alcohols. SOLUBILITY Alcohols Complete Ketones Complete Esters Complete Aromatic hydrocarbons Complete Aliphatic hydrocarbons Partial Water Not dilutable COMPATIBILITY Alkyd resins Very good Polyester resins Good Acrylic resins Very good Nitrocellulose Very good Cellulose acetate butyrate Very good Polyvinyl butyral Very good FDA STATUS CYMEL UI-19-I resin has FDA acceptance for food-contact use as directed in the following section of the Code of Federal Regulations: 21 CFR 175.300 (Resinous and polymeric coatings). Isobutylated urea-formaldehyde crosslinking agent with a medium degree of alkylation, a medium methylol content and low imino functionality. In solvent borne systems, very effective crosslinking agent for backbone polymers containing hydroxyl, carboxyl or amide functional groups such as alkyd/polyester or acrylic resins. Designed for use in fast curing wood coating systems, providing excellent stackability and very good chemical resistance properties. Due to its high electrostatic resistivity, is recommended for electrostatic spray applications. Insoluble in water and, because of its polymeric and hydrophobic nature, is not recommended in water borne systems. Requires weak acid catalysts for cure at normal baking schedules. The acidity of the primary film former is usually sufficient to initiate the curing process. In two-pack acid curing systems, strong acids like paratoluene sulphonic acid are recommended as the best catalysts. In one-pack acid curing finishes, weak acids with a pKa value higher than 1.9 are strongly recommended. Formulated systems containing it have to be stabilised with primary alcohols, amines or with a combination of these. Acid curing systems are usually stabilised only by addition of adequate amounts of primary alcohols. Complete solubility in ketones, esters, alcohols. Not dilutable in water. Partial solubility in aromatic hydrocarbons, aliphatic hydrocarbons. Very good compatibility with alkyd resins, polyester resins, acrylic resins, nitrocellulose, cellulose acetate butyrate, polyvinyl butyral.