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Low-viscosity liquid trimer based on toluene diisocyanate (TDI), enabling easy handling and metering in automated production systems.
Excellent compatibility with polyester and polyether polyols, supporting broad formulation flexibility for high-performance coatings and adhesives.
Provides fast room-temperature cure kinetics without requiring external catalysts, improving line efficiency and energy savings.
Delivers superior chemical resistance, including resistance to solvents, oils, and mild acids, enhancing end-product durability.
Complies with REACH and meets Covestro’s stringent quality and sustainability standards for industrial polyurethane systems.
Two-component polyurethane coatings for industrial metal protection and coil coating applications.
High-durability clearcoats and topcoats for automotive refinish and OEM finishing systems.
Structural adhesives and sealants requiring rapid development of cohesive strength and environmental resistance.
Flexible and rigid foam systems where controlled reactivity and low free isocyanate content are critical.
Specialty elastomers and castable polyurethane parts for mechanical engineering and mining equipment.
| Chemical Type | Aliphatic-free TDI-based isocyanurate trimer |
| Product Form | Clear to pale yellow liquid |
| Appearance | Homogeneous, transparent liquid at 25 °C |
| NCO Content (wt %) | 13.5 – 14.5 |
| Viscosity at 25 °C (mPa·s) | 800 – 1,200 |
| Free TDI (ppm) | < 100 |
| Storage Stability | Stable for ≥12 months at 15–25 °C under dry, inert conditions |
| Primary Applications | 2K PU coatings, adhesives, sealants, and elastomers |
Q1: What is the primary function of Desmodur IL EA in coating and adhesive formulations?
A: Desmodur IL EA is a low-viscosity, aliphatic-free TDI-based trimer curing agent designed to react with hydroxyl-functional resins—such as polyesters, acrylics, or polyethers—to form durable, chemically resistant polyurethane networks. It enables ambient- or low-temperature cure profiles while maintaining good pot life and film clarity.
Q2: How does Desmodur IL EA differ from standard aromatic isocyanate trimers like Desmodur IL?
A: Unlike conventional aromatic trimers, Desmodur IL EA contains no free TDI monomer and features a tailored molecular structure that delivers improved hydrolytic stability, reduced volatility, and enhanced compatibility with sensitive resin systems—particularly where color retention and long-term UV resistance are critical.
Q3: Is Desmodur IL EA suitable for use in high-solids or solvent-free formulations?
A: Yes—its low viscosity and high functionality make it well-suited for high-solids coatings, UV/thermal hybrid systems, and low-VOC formulations. It can be incorporated into solvent-free or water-reducible systems when paired with appropriate dispersants or reactive diluents, though compatibility testing is recommended for each specific formulation.
Q4: What safety and handling precautions should be observed?
A: As with all isocyanate-based curing agents, Desmodur IL EA requires handling in well-ventilated areas with appropriate PPE—including nitrile gloves, chemical-resistant goggles, and respiratory protection if aerosol or vapor exposure is possible. Avoid contact with moisture during storage and processing, and always refer to the latest Safety Data Sheet (SDS) for detailed occupational hygiene guidance.
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