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High hydroxyl functionality for excellent crosslinking density with amino and isocyanate curing agents.
Optimized molecular weight distribution for balanced flow, leveling, and film hardness.
Low volatile organic compound (VOC) content, supporting compliant high-solids coating formulations.
Superior UV resistance and gloss retention in exterior durable coatings.
Good compatibility with common acrylic, polyester, and cellulose ester resins.
Automotive OEM clearcoats and basecoats.
Industrial maintenance coatings for metal substrates.
General-purpose coil coatings requiring weatherability and flexibility.
High-performance plastic coatings for automotive interior and exterior trim.
Powder coating hybrid systems where solution-based acrylics enhance flow and appearance.
| Chemical Type | Hydroxyl-functional acrylic copolymer |
| Product Form | Liquid resin in aromatic solvent blend |
| Appearance | Clear, colorless to pale yellow liquid |
| Hydroxyl Value (mg KOH/g) | 110–130 |
| Acid Value (mg KOH/g) | < 5 |
| Solids Content (% w/w) | 50 ± 1 |
| Viscosity (25°C, mPa·s) | 1,800–2,400 |
| Specific Gravity (25°C) | 0.96–0.99 |
Q1: What is the primary function of MACRYNAL SM 548 50X in coating formulations?
A: MACRYNAL SM 548 50X serves as a hydroxyl-functional acrylic resin designed to act as a reactive binder in two-component polyurethane and polyester-based systems. It contributes to film formation, crosslink density, and enhances mechanical properties such as hardness, flexibility, and chemical resistance.
Q2: Is MACRYNAL SM 548 50X compatible with common isocyanate crosslinkers?
A: Yes — it is formulated for compatibility with standard aliphatic and aromatic polyisocyanates, including HDI-based trimer and biuret types, as well as IPDI and TDI derivatives. Optimal performance is typically achieved with low-viscosity, solvent-borne or high-solids isocyanate hardeners.
Q3: How should MACRYNAL SM 548 50X be stored and handled to maintain stability?
A: Store in tightly sealed containers under cool, dry conditions away from direct sunlight and strong oxidizing agents. Avoid prolonged exposure to moisture or elevated temperatures, which may affect viscosity and hydroxyl functionality over time. Standard industrial handling precautions for organic resins apply.
Q4: Can MACRYNAL SM 548 50X be used in high-solids or low-VOC coating systems?
A: Yes — its relatively low solution viscosity and high solids content make it suitable for high-solids formulations. It can be integrated into solvent-borne systems targeting reduced VOC emissions, though final compliance depends on the full formulation matrix and regulatory context.
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