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High hydroxyl functionality for excellent crosslink density with melamine and polyisocyanate curing agents.
Optimized molecular weight distribution for balanced flow, leveling, and film hardness development.
Low VOC formulation compliant with stringent environmental regulations (≤70 g/L VOC in typical baked coatings).
Superior weather resistance and UV stability, supporting long-term gloss retention and color stability.
Good compatibility with common acrylics, alkyds, and cellulose esters in multi-resin coating systems.
Automotive OEM topcoats and clearcoats requiring high durability and appearance.
Industrial maintenance coatings for metal substrates including agricultural and construction equipment.
Appliance coatings for refrigerators, ovens, and laundry units requiring bake performance and chip resistance.
General-purpose coil coatings where corrosion resistance and formability are critical.
Plastic coatings for automotive interior trim and exterior components.
| Chemical Type | Hydroxyl-functional acrylic copolymer |
| Product Form | Liquid resin solution |
| Appearance | Clear, pale yellow liquid |
| Solvent System | 70% Butyl acetate (BAC), balance proprietary solvents |
| Hydroxyl Value (mg KOH/g) | 120–135 |
| Acid Value (mg KOH/g) | <5 |
| Non-Volatile Content (% w/w) | 70 ± 1 |
| Viscosity (DIN 4, 23°C, mPa·s) | 800–1200 |
Q1: What is the primary function of MACRYNAL SM 2855 70BAC in coating formulations?
A: MACRYNAL SM 2855 70BAC serves as a hydroxyl-functional acrylic resin, primarily used as a reactive binder in two-component polyurethane and polyester-based coating systems. It contributes to film formation, hardness development, and chemical resistance while maintaining good gloss and clarity.
Q2: Is this resin suitable for high-solids or low-VOC applications?
A: Yes — SM 2855 70BAC is formulated with a relatively high solid content and moderate viscosity, making it well-suited for high-solids coatings. Its reactivity and compatibility support VOC-reduction strategies when paired with appropriate crosslinkers and solvent blends.
Q3: Which crosslinkers are commonly used with this resin?
A: It exhibits excellent compatibility with aliphatic isocyanate crosslinkers (e.g., HDI trimer and biuret types) and melamine-formaldehyde resins. Selection depends on end-use requirements such as UV stability, cure temperature, and regulatory compliance.
Q4: How does SM 2855 70BAC compare to other hydroxyl acrylic resins in terms of weathering performance?
A: As an aliphatic acrylic resin, it delivers inherently superior UV stability and gloss retention compared to aromatic or polyester-based hydroxyl resins — especially important in exterior architectural and automotive refinish applications.
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