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High hydroxyl functionality for efficient crosslinking with melamine and polyisocyanate curing agents.
Excellent compatibility with common solvent-based and high-solids coating systems.
Superior weatherability and UV resistance, supporting long-term gloss and color retention.
Low viscosity profile enabling high-solids formulation without sacrificing flow or leveling.
Consistent batch-to-batch reproducibility meeting stringent quality control standards for industrial coatings.
Automotive OEM clearcoats and basecoats.
Industrial maintenance coatings for metal and plastic substrates.
General-purpose coil coatings requiring durability and flexibility.
High-performance appliance finishes demanding hardness and chemical resistance.
Refinish coatings for automotive and heavy-duty equipment.
| Chemical Type | Hydroxyl-functional acrylic copolymer |
| Product Form | Liquid resin solution |
| Appearance | Clear, pale yellow liquid |
| Solvent System | Standard aromatic hydrocarbon blend (e.g., xylene/toluene) |
| Hydroxyl Value (mg KOH/g) | 75–85 |
| Acid Value (mg KOH/g) | < 5 |
| Non-Volatile Content (% w/w) | 55–60 |
| Viscosity (mPa·s, 25°C, #2 spindle, 60 rpm) | 1,200–1,800 |
Q1: What is the primary function of Hypomer FS-4460 in coating formulations?
A: Hypomer FS-4460 serves as a hydroxyl-functional acrylic resin designed to act as a reactive co-resin in two-component polyurethane and polyester-based systems. It contributes to crosslink density, enhancing hardness, chemical resistance, and film integrity upon curing.
Q2: Is Hypomer FS-4460 compatible with common isocyanate crosslinkers?
A: Yes — it is formulated for compatibility with standard aliphatic and aromatic isocyanate hardeners, including HDI trimer, IPDI biuret, and TDI-based crosslinkers. Optimal performance is achieved when used with isocyanates offering balanced reactivity and weathering stability.
Q3: How does FS-4460 influence cure speed and pot life in 2K PU systems?
A: As a mid-to-high hydroxyl value acrylic resin, FS-4460 supports moderate-to-rapid cure development at ambient or elevated temperatures, while maintaining a practical pot life — typically several hours depending on catalyst level, temperature, and isocyanate selection.
Q4: Can FS-4460 be used in high-solids or low-VOC coatings?
A: Yes — its molecular design and solvent profile support formulation into high-solids and low-VOC coating systems. It enables good flow, leveling, and crosslink efficiency without requiring excessive reactive diluents or high-boiling solvents.
Q5: What are typical handling and storage recommendations for this resin?
A: Store in tightly sealed containers under cool, dry conditions, away from moisture, strong oxidizers, and direct sunlight. Avoid prolonged exposure to ambient humidity during handling, as the hydroxyl functionality may react with water over time.
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