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Highly reactive aliphatic isocyanate based on hexamethylene diisocyanate (HDI) trimer chemistry.
Excellent weather resistance and UV stability, enabling long-term gloss and color retention in coatings.
Low viscosity for easy handling and improved formulation compatibility with hydroxyl-functional resins.
Non-yellowing performance ideal for clearcoats and high-performance topcoats requiring optical clarity.
Compliant with major global VOC regulations and suitable for low-VOC coating systems.
Automotive OEM and refinish clearcoats and basecoats.
Industrial maintenance coatings for metal and plastic substrates.
High-end wood finishing systems including furniture and flooring coatings.
Aerospace interior and exterior protective coatings.
General-purpose polyurethane two-component (2K) protective and decorative coatings.
| Chemical Type | Aliphatic HDI-based trimer |
| Product Form | Liquid |
| Appearance | Colorless to pale yellow transparent liquid |
| NCO Content (wt%) | 19.5–20.5% |
| Viscosity (25°C, mPa·s) | 800–1,200 |
| Density (25°C, g/cm³) | 1.16–1.18 |
| Solvent | Acetate-based (e.g., butyl acetate) |
| Storage Stability | ≥12 months at 5–30°C in sealed container |
Q1: What is the primary chemical composition of CORONATE HX?
A: CORONATE HX is a low-viscosity, aliphatic polyisocyanate based on hexamethylene diisocyanate (HDI) trimer chemistry, modified to provide enhanced storage stability and controlled reactivity in two-component coating and adhesive systems.
Q2: How does CORONATE HX compare to standard HDI trimer in terms of pot life and film formation?
A: Due to its tailored molecular structure and steric hindrance, CORONATE HX offers extended pot life compared to conventional HDI trimers while maintaining excellent through-cure and low-temperature film formation capability—particularly beneficial for high-solids and ambient-cure applications.
Q3: Is CORONATE HX suitable for use in UV-resistant topcoats and clearcoats?
A: Yes—its aliphatic nature and high degree of symmetry confer exceptional resistance to UV-induced yellowing and gloss loss, making it well-suited for demanding architectural, automotive refinish, and industrial clearcoat systems requiring long-term color and clarity retention.
Q4: What types of resins or polymers does CORONATE HX typically crosslink with?
A: CORONATE HX is widely used with hydroxyl-functional acrylics, polyesters, and alkyds in two-component formulations. It demonstrates good compatibility and reactivity with both solventborne and waterborne polyol dispersions, especially where low NCO volatility and balanced cure speed are required.
Q5: How should CORONATE HX be handled and stored to maintain optimal performance?
A: Store in tightly sealed containers under dry, cool conditions (below 30°C), protected from moisture and direct sunlight. Avoid prolonged exposure to ambient humidity during handling, as isocyanates are moisture-sensitive; use desiccant-dried air or nitrogen blanketing when transferring or dispensing to prevent gelation or viscosity increase.
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