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High hydroxyl functionality for excellent crosslinking efficiency with melamine and polyisocyanate curing agents.
Low VOC formulation suitable for compliant industrial coating systems requiring reduced solvent emissions.
Outstanding gloss retention and UV resistance in outdoor-cured and baked finishes.
Good compatibility with common acrylic, polyester, and alkyd resins in hybrid binder systems.
Consistent batch-to-batch reproducibility ensuring reliable performance in high-volume production.
Automotive OEM topcoats and clearcoats.
Industrial maintenance coatings for metal substrates.
General-purpose coil coatings requiring durable film formation.
High-performance appliance finishes (refrigerators, washing machines).
Plastic coatings for automotive interior trim and exterior components.
| Chemical Type | Hydroxyl-functional acrylic copolymer |
| Product Form | Liquid resin solution |
| Appearance | Clear to slightly hazy, pale yellow liquid |
| Solvent System | Aromatic hydrocarbons and esters |
| Solids Content (wt%) | 55 ± 2% |
| Hydroxyl Value (mg KOH/g) | 70–80 |
| Acid Value (mg KOH/g) | < 5 |
| Viscosity (25°C, mPa·s) | 1,200–1,800 |
Q1: What is the primary function of MACRYNAL SM 518 55LG in coating formulations?
A: MACRYNAL SM 518 55LG is a hydroxyl-functional acrylic resin designed to serve as a reactive binder in two-component polyurethane and melamine-cured systems. It contributes to film formation, hardness development, and long-term durability while maintaining excellent clarity and UV stability.
Q2: Is this resin suitable for high-solids or low-VOC coating applications?
A: Yes — SM 518 55LG is formulated to support high-solids coatings and can be integrated into low-VOC systems when paired with appropriate solvents and crosslinkers. Its molecular design enables good flow and leveling without requiring high solvent demand.
Q3: Which crosslinkers are commonly used with this resin?
A: It is compatible with standard aliphatic isocyanate crosslinkers (e.g., HDI-based trimer or biuret types) and amino resins such as highly methylated melamines. Compatibility and cure performance should be verified experimentally based on specific formulation targets.
Q4: How does SM 518 55LG perform in terms of weather resistance and gloss retention?
A: As a purely acrylic hydroxyl resin with no aromatic content, it delivers strong inherent UV resistance and excellent gloss retention in exterior applications — particularly when cured with aliphatic isocyanates.
Q5: Can this resin be used in automotive refinish or OEM topcoats?
A: Yes — it is widely employed in premium refinish clearcoats and select OEM basecoat/clearcoat systems where high clarity, flexibility, and compatibility with fast-cure catalysts are required. Formulation optimization is recommended to meet specific application and regulatory requirements.
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