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High hydroxyl functionality for excellent crosslinking density with melamine and polyisocyanate curing agents.
Optimized molecular weight distribution for balanced flow, leveling, and film hardness development.
Low viscosity in common organic solvents enabling high-solids formulation flexibility.
Superior UV resistance and gloss retention in outdoor-cured coatings.
Consistent batch-to-batch reproducibility meeting stringent automotive OEM quality requirements.
Automotive original equipment manufacturer (OEM) topcoats and clearcoats.
Refinish coatings for automotive and heavy-duty vehicle repair.
Industrial maintenance coatings requiring weatherability and chemical resistance.
High-performance coil coatings for architectural and appliance substrates.
Powder coating hybrid systems where acrylic backbone enhances film integrity.
| Chemical Type | Hydroxyl-functional acrylic copolymer |
| Product Form | Liquid resin solution |
| Appearance | Clear to slightly hazy amber liquid |
| Solvent System | Xylene / butyl acetate / ester-based blend |
| Hydroxyl Value (mg KOH/g) | 64–68 |
| Acid Value (mg KOH/g) | < 5 |
| Non-Volatile Content (% w/w) | 64–66 |
| Viscosity (mPa·s, 25°C, DIN 4.0) | 1,800–2,400 |
Q1: What is the primary function of MACRYNAL SM 512 65BACX in coating formulations?
A: MACRYNAL SM 512 65BACX serves as a hydroxyl-functional acrylic resin designed to act as a reactive binder in two-component polyurethane and polyester-based systems, contributing to crosslink density, film hardness, gloss retention, and chemical resistance.
Q2: Is this resin suitable for high-solids or low-VOC coatings?
A: Yes — its moderate molecular weight and balanced polarity support formulation flexibility in medium-to-high solids solventborne systems, helping formulators meet VOC reduction targets without compromising flow, leveling, or cure performance.
Q3: How does SM 512 65BACX compare to other hydroxyl acrylic resins in terms of yellowing resistance?
A: As a purely acrylic backbone resin with no aromatic monomers, it offers inherently superior UV stability and low tendency to yellow upon thermal aging or exposure, making it well-suited for clearcoats and light-colored topcoats requiring long-term color fidelity.
Q4: Can it be used in combination with melamine-formaldehyde crosslinkers?
A: While primarily optimized for isocyanate-based curing, it can react with melamine resins under appropriate acid catalysis and baking conditions; however, compatibility, cure schedule, and final film properties should be verified experimentally for each specific formulation.
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