Description and features
The curing mechanism between Vicura MC-68 (Pyromellitic Acid Diphenyl Imidazoline Salt) forms a complex with the epoxy resin. Two parallel processes occur: the direct reaction between the imidazoline and the epoxy group, and the homopolymerization of the epoxy resin catalyzed by Vicura MC-68. Unlike most powder coating systems, where the optimal ratio between the crosslinker and the binder is close to the stoichiometric ratio, the optimal ratio for Vicura MC-68 is typically determined empirically. For epoxy resins commonly used in powder coatings (with epoxy equivalent weights between 700 and 1000), manufacturers recommend starting with 8.0 – 10.0% of Vicura MC-68.
Availability
Europe: Vicura MC-68 is in stock in our local warehouses. Our lead time is about one week if delivered in 20 KG carton boxes.
We can also serve Canada, South America, South Africa, and other markets. Please contact our sales department for more details.
This substance (CAS: 54553-90-1) has been registered under
REACH (EC) 1907/2006.
Product Identification
| CAS number | 54553-90-1 |
| EC number | 259-224-2 |
| HS code | 2933 2990 90 |
Specification
| Appearance | White very fine powder |
| Assay | ≥99.00 % |
| Melting range | 220 – 230 °C |
| Water content | ≤0.50 % |
Application
Vicura MC-68 (Pyromellitic Acid Diphenyl Imidazoline Salt) is an organic salt of polycarboxylic acid and cyclic amidine, used as a crosslinker in matt epoxy and polyester/epoxy hybrid powder coatings. It produces a more pronounced matting effect than Vicura MC-55. When used alone, Vicura MC-68 achieves gloss levels below 10 (Gardner 600) in matt epoxy powder coatings. To increase gloss, manufacturers can partially replace it with the “high gloss crosslinker” Vicura MC-31, with the optimal ratio determined experimentally. In polyester/epoxy coatings, gloss levels between 10 and 70 (Gardner 600) are achieved by replacing part of the polyester with Vicura MC-68 and increasing the epoxy resin content. The curing reaction with epoxy groups begins above 180°C, and higher temperatures accelerate the curing process, bringing it in line with typical thermosetting powder coatings.
Packaging
Available packaging: 20 KG carton boxes.
Special packaging is available on request.
Storage
Store Pyromellitic Acid Diphenyl Imidazoline Salt in a cool, dry, and well-ventilated area, in accordance with legal requirements. Furthermore, ensure that all storage conditions comply with safety regulations to maintain the integrity of the product.
MSDS
A Material Safety Data Sheet (MSDS) is available for Vicura MC-68 and all other products supplied by Vesta Chemicals BV.
An MSDS outlines the hazards of a product and explains how to handle, use, and store the product safely. Besides it provides important regulatory and emergency response information for the purchased product.
Molecular and structural information
| Molecular formula | C19H16N2O8 |
| Molecular weight | 400.34 g/mol |
| Smiles notation | C1CC(C(C1)OC(=O)C2=CC=C(C=C2)[N+](=O)[O-])OC(=O)C3=CC=C(C=C3)[N+](=O)[O-] |
| InChi key | TZBVXASHYYFGHZ-UHFFFAOYSA-N |
| Structural formula |  |
Physicochemical information
| Boiling point | >201 ºC @ 1 atm |
| Bulk density | 1.540 kg/m3 |
| Flash point | >200 ºC @ 1 atm |
| Melting point | >210 – < 235 ºC at 1 atm |
| Partition coefficient (log Pow) | 1 @ 25 ºC |
| Solubility in water | 3 g/l @ 20 ºC / PH 2.9 |
| Vapor pressure (MGM) | 0 kPa @ 25 ºC |