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High hydroxyl functionality for excellent crosslink density with melamine and polyisocyanate curing agents.
Low VOC content compliant with stringent environmental regulations for industrial coatings.
Superior gloss retention and UV resistance in exterior durable topcoats.
Excellent compatibility with common solvent-borne resins and pigments.
Good flow and leveling characteristics for high-quality film formation.
Automotive OEM and refinish clearcoats and basecoats.
Industrial maintenance coatings for metal substrates.
General-purpose coil coatings requiring weatherability and hardness.
High-performance appliance finishes (refrigerators, washing machines).
Precision equipment and electronics enclosures requiring low outgassing.
| Chemical Type | Hydroxyl-functional acrylic copolymer |
| Product Form | Liquid resin solution |
| Appearance | Clear to slightly pale yellow liquid |
| Solvent System | Aromatic-free (proprietary aliphatic blend) |
| Hydroxyl Value (mg KOH/g) | 70–78 |
| Acid Value (mg KOH/g) | < 5 |
| Non-Volatile Content (% wt) | 70 ± 2 |
| Viscosity (DIN 4, 23°C, mPa·s) | 3,500–5,500 |
Q1: What is the primary function of MACRYNAL SM 516 70BAC in coating formulations?
A: MACRYNAL SM 516 70BAC serves as a hydroxyl-functional acrylic resin designed to act as a reactive binder in two-component polyurethane and polyester-based coating systems. It contributes to film formation, crosslink density, hardness development, and chemical resistance upon curing with suitable isocyanate hardeners.
Q2: Is this resin compatible with common aliphatic isocyanate crosslinkers?
A: Yes, MACRYNAL SM 516 70BAC is formulated for compatibility with standard aliphatic polyisocyanates, including HDI-based trimer and biuret types. Its hydroxyl functionality and molecular weight profile support good mixing stability and efficient cure kinetics under ambient or forced-dry conditions.
Q3: How does the 70% solids content influence formulation handling and VOC considerations?
A: With approximately 70% non-volatile content, MACRYNAL SM 516 70BAC enables formulators to achieve target viscosity and solids levels while helping reduce overall VOC contribution compared to lower-solids alternatives. Solvent selection should be guided by compatibility with co-resins and desired evaporation rate for application performance.
Q4: Can this resin be used in high-gloss, weather-resistant topcoats?
A: Yes — its acrylic backbone provides inherent UV stability and clarity, making it well-suited for high-performance topcoats requiring long-term gloss retention, color stability, and resistance to chalking or yellowing when properly cured in outdoor applications.
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