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High hydroxyl functionality for robust crosslinking with melamine and polyisocyanate curing agents.
Excellent compatibility with common solvent-borne acrylic and polyester resins.
Optimized molecular weight distribution for balanced flow, leveling, and film hardness.
Low VOC formulation suitable for industrial coatings complying with stringent environmental regulations.
Superior UV resistance and gloss retention in demanding exterior applications.
Automotive OEM topcoats and clearcoats.
Industrial maintenance coatings for metal substrates.
General-purpose coil coatings requiring high durability and aesthetics.
Prefinished building products including aluminum composite panels (ACM) and architectural extrusions.
High-performance refinish coatings for automotive and heavy equipment.
| Chemical Type | Hydroxyl-functional acrylic copolymer |
| Product Form | Liquid resin solution |
| Appearance | Clear, pale yellow liquid |
| Solvent System | Aromatic hydrocarbons and esters |
| Hydroxyl Value (mg KOH/g) | 65–75 |
| Acid Value (mg KOH/g) | < 5 |
| Non-Volatile Content (% w/w) | 55 ± 2 |
| Viscosity (DIN 4, 25°C) | 80–120 mPa·s |
Q1: What is the primary function of SETALUX 91780 VS-55 in coating formulations?
A: SETALUX 91780 VS-55 serves as a hydroxyl-functional acrylic resin designed to act as a reactive binder in two-component polyurethane (2K PU) and other crosslinking systems. It contributes to film formation, enhances hardness and chemical resistance, and supports excellent gloss retention and weatherability in high-performance topcoats.
Q2: Is SETALUX 91780 VS-55 compatible with common isocyanate crosslinkers?
A: Yes — it is specifically engineered for compatibility with aliphatic isocyanate crosslinkers, including HDI-based trimer and biuret types. Its hydroxyl functionality and molecular architecture support efficient curing, good pot life, and balanced reactivity under standard industrial application conditions.
Q3: How does SETALUX 91780 VS-55 perform in terms of solvent resistance and flexibility?
A: The resin delivers robust solvent resistance after full cure, particularly against hydrocarbons, alcohols, and cleaning agents commonly encountered in automotive and industrial maintenance applications. Its acrylic backbone provides a favorable balance between rigidity and chain mobility, supporting both scratch resistance and substrate adhesion without excessive brittleness.
Q4: Can SETALUX 91780 VS-55 be used in low-VOC or high-solids formulations?
A: Yes — it is formulated for use in medium-to-high solids 2K PU systems and is well-suited for VOC-compliant coatings. Its viscosity and solubility profile allow formulators to achieve target solids levels while maintaining sprayability and flow-out, especially when paired with appropriate solvent blends.
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