Cymel 1168 Methoxymethyl, isobutoxymethyl melamine-formaldehyde resin Cytec Crosslinking / Coupling / Curing Agents >> Amine >> Melamine-formaldehyde Acrylic/Acrylate Resins Alkyd Resins Cellulosic Resins Epoxy Resins Polyester Vinyl Coatings >> Solvent-Free/ High-Solids Automotive OEM >> Top coats Automotive refinishing >> Enamels Metal Soluble in alcohols, esters, ketones, glycols and glycol ethers Insoluble in water CYMEL 1168 resin is a high solids methoxymethyl, isobutoxymethyl melamine-formaldehyde resin recom-mended as a crosslinking agent for polymers and resins containing hydroxyl, carboxyl or amide functionalities. CYMEL 1168 resin is especially recommended for auto-motive top-coat finishes and for general metal finishes providing intercoat adhesion and resistance properties. CYMEL 1168 resin is compatible with a wide range of polymeric materials such as epoxy resins, alkyd and polyester resins, certain types of acrylic and vinyl resins and cellulosics. Highly alkylated, CYMEL 1168 resin is an efficient crosslinking agent for hydroxyl, carboxyl and amide func-tional polymers. The crosslinking reaction follows the reaction pathway for specific acid catalysis and requires an acid catalyst with pKa value of <1. Strong acids, which include the mineral acids and the organic sulfonic acids such as CYCAT ® 4040 catalyst, CYCAT 600 cata-lyst and CYCAT 500 catalyst are the most widely used catalysts for systems using CYMEL 1168 resin. Finishes using CYMEL 1168 resin as the crosslinking agent can be stabilized very effectively with amines as well as alcohols. In many high-solids formulations it is not practical to incorporate a sufficiently high level of alcohol to maintain adequate enamel stability. As much alcohol as possible should be used, however, to insure amino resin and catalyst solubility. Good stability has been obtained in high-solids systems by the use of a blocked catalyst with as little as 25% of the added sol-vent as a primary alcohol. Highly alkylated, high-solids methoxymethyl, isobutoxymethyl melamine-formaldehyde resin. Used as an efficient crosslinking agent for polymers and resins containing hydroxyl, carboxyl or amide functionalities in automotive topcoat finishes and general metal finishes. Provides intercoat adhesion and resistance properties. Gives compatibility with epoxy resins, alkyd and polyester resins, certain types of acrylic and vinyl resins and cellulosics.