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High-reactivity aliphatic isocyanate based on hexamethylene diisocyanate (HDI) trimer chemistry.
Excellent weather resistance and UV stability, preventing yellowing in outdoor applications.
Low viscosity enables easy handling, precise metering, and homogeneous mixing with hydroxyl-functional resins.
Non-yellowing performance suitable for clearcoats and light-colored coating systems.
Compliant with major global VOC regulations and formulated for low-monomer content (<0.1% free HDI).
Automotive OEM clearcoats and basecoat/clearcoat systems.
High-performance industrial maintenance coatings for machinery and infrastructure.
Premium architectural coatings requiring long-term gloss retention and color stability.
Plastic coatings for automotive interior trim and consumer electronics housings.
UV-resistant wood finishes for premium furniture and flooring applications.
| Chemical Type | Aliphatic HDI-based polyisocyanate (trimer) |
| Product Form | Liquid |
| Appearance | Clear, pale yellow liquid |
| NCO Content (wt%) | 21.5–22.5% |
| Viscosity (mPa·s at 25°C) | 800–1,200 |
| Free HDI Monomer (wt%) | <0.1% |
| Density (g/cm³ at 25°C) | 1.18–1.22 |
| Flash Point (°C, closed cup) | 145–155 |
Q1: What is the primary chemical composition of CORONATE HXR?
A: CORONATE HXR is a low-viscosity, aliphatic polyisocyanate based on hexamethylene diisocyanate (HDI) trimer chemistry, modified to provide enhanced hydrolytic stability and reduced volatility compared to standard HDI trimers.
Q2: How does CORONATE HXR differ from conventional HDI-based curing agents in terms of performance?
A: CORONATE HXR offers improved compatibility with hydroxyl-functional resins, reduced sensitivity to moisture during processing, and superior long-term UV resistance and gloss retention in final coatings—making it especially suitable for high-performance clearcoats and outdoor applications.
Q3: What types of resin systems is CORONATE HXR typically used with?
A: It is commonly paired with polyester, acrylic, and polyether polyols in two-component polyurethane coating systems, particularly where excellent weatherability, flexibility, and low-temperature cure capability are required.
Q4: Is CORONATE HXR suitable for low-VOC or high-solids formulations?
A: Yes—its low viscosity and high functionality allow formulators to achieve high solids content with minimal solvent addition, supporting compliance with evolving VOC regulations without sacrificing pot life or film properties.
Q5: What safety and handling precautions should be observed when using CORONATE HXR?
A: As with all isocyanate-containing materials, appropriate personal protective equipment—including nitrile gloves, chemical-resistant goggles, and respiratory protection in poorly ventilated areas—is essential. Avoid skin contact and inhalation of vapors or aerosols, and store in tightly sealed containers under dry, cool conditions.
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