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High reactivity in UV-curable systems for rapid through-cure and excellent surface hardness.
Low viscosity enables formulation flexibility and improved pigment wetting without excessive diluent addition.
Outstanding adhesion to diverse substrates including plastics, metals, and wood composites.
Excellent weathering resistance with minimal yellowing under UV exposure and outdoor aging conditions.
Good chemical resistance to alcohols, weak acids, and household cleaners after full cure.
UV-curable coatings for plastic automotive interior trim (e.g., dashboards, control panels).
High-gloss decorative finishes on MDF and particleboard for furniture and cabinetry.
Protective topcoats for rigid PVC profiles and extruded polymer building components.
Functional coatings on polycarbonate and ABS electronics housings requiring abrasion resistance.
Overprint varnishes for UV-flexo and offset printing on rigid packaging substrates.
| Chemical Type | Aliphatic polyester acrylate oligomer |
| Product Form | Liquid resin |
| Appearance | Pale yellow, clear liquid |
| Viscosity (25°C, mPa·s) | 8,000–12,000 |
| Refractive Index (25°C) | 1.475–1.485 |
| Acid Value (mg KOH/g) | < 5 |
| Primary Applications | UV-curable clearcoats, topcoats, and functional protective layers |
| Key Features | Fast cure speed, high crosslink density, low shrinkage |
Q1: What is the primary application of UVECOAT T 37621 in UV-curable systems?
A: UVECOAT T 37621 is a low-viscosity, aliphatic polyester acrylate resin designed primarily as a reactive diluent and film-forming binder in UV-curable coatings for industrial wood, plastic, and metal substrates—especially where high gloss, flexibility, and chemical resistance are required.
Q2: How does UVECOAT T 37621 compare to aromatic acrylates in terms of yellowing resistance?
A: As an aliphatic polyester acrylate, UVECOAT T 37621 offers significantly improved UV stability and reduced tendency to yellow upon prolonged exposure compared to aromatic-based acrylates—making it well-suited for clear topcoats and applications demanding long-term color retention.
Q3: Is UVECOAT T 37621 compatible with common photoinitiators used in free-radical UV curing?
A: Yes, UVECOAT T 37621 demonstrates good compatibility with standard free-radical photoinitiators—including benzophenone derivatives, alpha-hydroxy ketones, and phosphine oxides—and supports efficient surface cure and through-cure in typical UV lamp configurations.
Q4: What handling or storage precautions should be observed for this resin?
A: Store in tightly sealed containers under inert atmosphere (e.g., nitrogen) at cool, dry conditions away from direct sunlight and heat sources. Exposure to ambient light or elevated temperatures over time may lead to premature oligomerization or viscosity increase.
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