CYMEL® NF 2000A

• Excellent environmental etch resistance
• Excellent exterior durability
• Non-formaldehyde chemistry
• Non-isocyanate chemistry
• Cure compatibility with other crosslinkers
• Low equivalent weight / high efficiency
• Low human toxicity

• A significant advantage of CYMEL® NF 2000A Resin is its cure compatibility with other thermoset chemistries.
• Since its cure response with hydroxy-functional resins is not appreciably inhibited by amines, acids, or metal catalysts, it can be used effectively as a co-crosslinking agent with other materials, such as traditional aminoplasts or isocyanates.
• Incorporation of low levels of CYMEL® NF 2000A Resin (e.g. 1-5 wt. % on total resin solids) into a conventional polyol/aminoplast coating formulation can significantly improve the exterior durability of the cured film.

• Automotive topcoats
• Coil coatings
• Exterior can coatings
• Solvent-borne and waterborne coatings

¹ Product may become hazy during storage as the active ingredient is near its solubility limit in solution. The haze development has no impact on performance of the product or the clarity of resulting films.

CYMEL® NF 2000A Resin contains a combination of butyl and methyl carbamate functionality which enables it to crosslink backbone polymers containing hydroxy, epoxy and carboxy functionality.

• Unlike conventional amino resins, CYMEL® NF 2000A Resin has very little tendency to self-react during cure, so its effective equivalent weight is in the range of 120-130.
• In formulations where it is employed as the sole crosslinker, the level of CYMEL® NF 2000A Resin is normally adjusted to provide a ratio of 1.0 - 1.1 equivalents of carbamate functionality per equivalent of backbone polymer functionality.
• CYMEL® NF 2000A Resin reacts with hydroxy functional backbone resins at >125°C bake schedules to form urethane linkages.
• Cure can typically be accomplished without use of a catalyst to yield films that exhibit excellent hardness, chemical resistance, exterior durability and environmental etch resistance. Addition of low levels of acid catalyst (e.g. 0.5% dodecyl benzene sulfonic acid on binder solids) has been found to improve humidity resistance properties in some systems.
• Both catalyzed and uncatalyzed formulations show good 1K package stability at 23°C.
• CYMEL® NF 2000A Resin will react with carboxy functional backbone resins, but requires bake temperatures >150°C.

• CYMEL® NF 2000A Resin reacts very efficiently with epoxy functional resins at ~125°C resulting in N-substituted carbamate and oxazolidone crosslinks.
• Films produced through this cure mechanism often show a favorable combination of environmental etch resistance and mar resistance properties.
• In most cases, a tertiary amine or quaternary ammonium catalyst such as 4-dimethyl- aminopyridine should be employed in the formulation.
• However, catalyzed pot life can be limited, making it necessary to treat these as two-component systems.

• CYMEL® NF 2000A Resin has a shelf life of 720 days from the date of manufacture when stored at temperatures below 32°C.