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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.
Outstanding gloss retention and UV resistance in exterior applications.
Good compatibility with common solvent-borne resins and pigments.
Optimized viscosity for efficient spray application and high-solids formulation flexibility.
Automotive OEM clearcoats and basecoats.
Industrial maintenance coatings for metal substrates.
General-purpose coil coatings requiring durability and weatherability.
High-performance appliance finishes.
Refinish coatings for automotive and heavy-duty equipment.
| Chemical Type | Hydroxyl-functional acrylic copolymer |
| Product Form | Liquid resin solution |
| Appearance | Clear to slightly yellow, homogeneous liquid |
| Solvent System | Aromatic-free (proprietary aliphatic/oxygenated blend) |
| Hydroxyl Value (mg KOH/g) | 55–60 |
| Acid Value (mg KOH/g) | < 5 |
| Non-Volatile Content (% wt) | 55 ± 1 |
| Viscosity (25°C, mPa·s, DIN 4) | 3,000–5,000 |
Q1: What is the primary function of MACRYNAL SM 685 55BAC in coating formulations?
A: MACRYNAL SM 685 55BAC serves as a hydroxyl-functional acrylic resin, primarily used as a reactive binder in two-component polyurethane and melamine-cured systems. It contributes to film formation, hardness development, and chemical resistance while maintaining good clarity and UV stability.
Q2: Is this resin suitable for high-solids or low-VOC applications?
A: Yes — MACRYNAL SM 685 55BAC is formulated for compatibility with high-solids coating systems and supports VOC-reduction strategies. Its molecular design enables good flow and leveling at reduced solvent levels, though final formulation adjustments may be needed to meet specific regulatory or performance targets.
Q3: How does it compare to other hydroxyl acrylic resins in terms of cure speed and flexibility?
A: Compared to many standard hydroxyl acrylics, SM 685 55BAC offers a balanced profile: moderate hydroxyl functionality supports efficient crosslinking without excessive brittleness, enabling good through-cure and substrate adhesion while retaining useful flexibility in the final film.
Q4: Can it be used in automotive refinish or OEM coatings?
A: This resin is commonly employed in mid-to-high-performance refinish and select OEM topcoat applications where gloss retention, weatherability, and compatibility with common crosslinkers (e.g., HDI isocyanates) are critical. Formulation validation under end-use conditions is recommended.
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