CYREZ® 966

• Exceptionally fast cure response at low bake schedules in highly catalyzed systems
• Excellent balance between film flexibility and resistance properties

• Coil Coatings
• Paper and textile coatings
• Printing inks

Backbone Polymer Selection

• CYREZ® 966 resin contains mainly methoxymethyl functional sites making it a highly effective crosslinker for backbone polymer resins containing hydroxyl, carboxyl, or amide functional groups, such as those found on alkyd, polyester, or acrylic resins.
• Its high monomer content, and low tendency to self-condense results in films with high flexibility and formability when paired with inherently flexible polymers, such as polyester resins. The effective equivalent weight of CYREZ 966 typically ranges from 130 - 190 g/eq, however, its optimum loading should be determined experimentally for each formulation with consideration of the performance properties to be optimized.

Catalysis

• Because of its high extent of alkylation, CYREZ® 966 resin responds best to sulfonic acid catalysts, like CYCAT® 4040 catalyst or CYCAT® 600 catalyst.
• Generally, 0.5 to 1.0% of CYCAT® 4040 catalyst on total resin solids of the formulation is sufficient to provide good cure at normal baking schedules (15 - 20 minutes at 120 - 150°C) in solvent-borne systems.
• Water-borne systems generally require temperatures of 150°C or higher to effect cure.
• Higher concentrations of catalyst might be necessary if there are basic pigments or additives present in the formulation.

Formulation Stability

• The stability of formulated systems containing CYREZ® 966 resin can be enhanced by the addition of primary alcohols, amines or a combination of these.
• Low molecular weight primary alcohols, such as ethanol and n-butanol, are most effective.
• Recommended amines are DMEA or 2-AMP at a concentration of 0.5 - 1.0% on total resin solids.
• Package stability can also be enhanced by the use of a blocked acid catalyst, such as CYCAT® 4045 catalyst.
• For waterborne systems, pH should be adjusted to 7.5 - 8.5 to achieve optimum stability.

• CYREZ® 966 resin has a shelf life of 1800 days from the date of manufacture when stored at temperatures below 32°C.
• CYREZ® 966 resin will turn into a waxy solid when cold due to crystallization of hexamethoxymethylmelamine (HMMM).
• Warming will return the product to normal with no adverse impact on performance.