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High hydroxyl functionality for efficient crosslinking with isocyanates and melamine resins.
Excellent compatibility with common solvent-based coating systems and polyester polyols.
Superior weather resistance and UV stability, maintaining gloss and color retention over time.
Low viscosity profile enabling high-solids formulation without sacrificing flow or leveling.
Consistent batch-to-batch reproducibility meeting stringent automotive OEM requirements.
Automotive OEM topcoats and clearcoats.
Industrial maintenance coatings for metal substrates.
High-performance coil coatings requiring durability and flexibility.
Premium refinish coatings for passenger vehicles and commercial fleets.
Two-component polyurethane systems for architectural and transportation finishes.
| Chemical Type | Hydroxyl-functional acrylic copolymer |
| Product Form | Liquid resin solution |
| Appearance | Clear, pale yellow to amber liquid |
| Hydroxyl Value (mg KOH/g) | 65–75 |
| Acid Value (mg KOH/g) | ≤ 5 |
| Solids Content (% w/w) | 50 ± 2 (in xylene/ethyl acetate blend) |
| Viscosity (mPa·s at 25°C) | 800–1,200 |
| Density (g/cm³ at 25°C) | 0.94–0.97 |
Q1: What is the primary functional role of LR7615 in coating formulations?
A: LR7615 is a hydroxyl-functional acrylic polyol resin designed primarily as a reactive binder component in two-component polyurethane (2K PU) and other crosslinking systems. It contributes to film formation, flexibility, chemical resistance, and adhesion while enabling covalent network development upon curing.
Q2: Is LR7615 compatible with common isocyanate crosslinkers used in industrial coatings?
A: Yes, LR7615 exhibits good compatibility and reactivity with standard aliphatic and aromatic isocyanate hardeners, including HDI-based biuret and IPDI trimer types. Its hydroxyl value and molecular weight profile are optimized for balanced pot life and cure performance in ambient- or forced-dry applications.
Q3: How does LR7615 compare to conventional polyester polyols in terms of weatherability and yellowing resistance?
A: As an acrylic polyol, LR7615 offers superior UV stability and significantly reduced tendency to yellow under prolonged exposure compared to aromatic polyester polyols. This makes it especially suitable for high-durability topcoats where long-term gloss retention and color fidelity are critical.
Q4: Can LR7615 be used in low-VOC or solvent-reduced formulations?
A: Yes — LR7615 is formulated for compatibility with reactive diluents and can be effectively incorporated into low-solvent or high-solids 2K PU systems. Its viscosity and solubility characteristics support formulation flexibility without compromising crosslink density or final film properties.
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