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High hydroxyl functionality for excellent crosslinking 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 solubility in common organic solvents including xylene, butyl acetate, and PGMEA.
Consistent batch-to-batch performance ensuring reliable coating film formation and reproducibility.
Automotive OEM clearcoats and basecoats.
Industrial maintenance coatings for metal substrates.
General-purpose coil coatings requiring durability and weatherability.
Powder coating hybrid systems (acrylic-polyester blends).
High-performance wood finishes for furniture and architectural millwork.
| Chemical Type | Hydroxyl-functional acrylic copolymer |
| Product Form | Liquid resin solution |
| Appearance | Clear, pale yellow liquid |
| Solvent System | Aromatic hydrocarbons and esters |
| Hydroxyl Value (mg KOH/g) | 65–75 |
| Acid Value (mg KOH/g) | < 5 |
| Non-Volatile Content (% w/w) | 70 ± 1 |
| Viscosity (25°C, mPa·s) | 800–1,200 |
Q1: What is the primary function of MACRYNAL SM 636 70BAC in coating formulations?
A: MACRYNAL SM 636 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, enhances crosslink density, and supports key performance attributes such as hardness, chemical resistance, and gloss retention.
Q2: Is MACRYNAL SM 636 70BAC compatible with common isocyanate crosslinkers?
A: Yes — it is formulated for compatibility with standard aliphatic and aromatic isocyanate crosslinkers, including HDI trimer, IPDI biuret, and TDI-based hardeners. Optimal reactivity and pot life depend on catalyst selection, NCO:OH ratio, and ambient conditions during formulation and application.
Q3: How does the 70% solids content influence formulation handling and VOC management?
A: With approximately 70% non-volatile content, MACRYNAL SM 636 70BAC enables higher solids formulations compared to lower-solids alternatives, supporting reduced solvent demand and improved VOC compliance without compromising viscosity control or application properties in industrial coatings.
Q4: Can this resin be used in automotive refinish or OEM applications?
A: While not pre-qualified for all OEM specifications, MACRYNAL SM 636 70BAC is widely employed in high-performance refinish topcoats and mid-coat systems where balanced cure speed, sandability, and intercoat adhesion are required. End-use qualification should follow customer-specific testing protocols.
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