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Low-VOC, water-based formulation compliant with stringent environmental regulations including EU REACH and US EPA standards.
Excellent film-forming capability with balanced hardness and flexibility for durable coating performance.
Superior compatibility with acrylic emulsions, polyurethane dispersions, and common crosslinkers (e.g., aziridines, carbodiimides).
Good hydrolytic stability and storage stability at 5–40 °C for ≥12 months in sealed containers.
Low odor profile and non-flammable handling characteristics enhancing workplace safety.
Waterborne industrial maintenance coatings for metal substrates (e.g., machinery, agricultural equipment).
High-performance topcoats for architectural pre-finished metal (PPM) and coil coating primers.
Base resin for eco-friendly wood finishes requiring low migration and good adhesion on hardwood and MDF.
Component in hybrid waterborne systems for automotive under-hood plastic parts coatings.
Formulation backbone for functional protective coatings in electronics enclosures and white goods.
| Chemical Type | Aliphatic waterborne polyester dispersion |
| Product Form | Liquid dispersion in water |
| Appearance | Opaque milky white liquid, homogeneous |
| pH (25 °C) | 7.5–8.5 |
| Solids Content (wt%) | 35.0 ± 1.5 |
| Viscosity (mPa·s, 25 °C, Brookfield LVT, Spindle #2, 6 rpm) | 300–800 |
| Density (g/cm³, 25 °C) | 1.02–1.05 |
| Minimum Film Formation Temperature (MFFT) | 22–25 °C |
Q1: What is the primary application of VYLONAL ST-5870 in waterborne coatings?
A: VYLONAL ST-5870 is primarily used as a film-forming binder and performance modifier in high-gloss, low-VOC waterborne industrial coatings—especially for metal and wood substrates where durability, clarity, and chemical resistance are required.
Q2: How does ST-5870 differ from conventional solvent-based polyester resins?
A: Unlike solvent-based counterparts, ST-5870 is supplied as a stable aqueous dispersion with no added organic solvents. It offers reduced environmental impact and improved workplace safety while maintaining good hardness development, hydrolytic stability, and compatibility with common waterborne crosslinkers such as melamine formaldehyde or polyisocyanate dispersions.
Q3: Can ST-5870 be blended with other waterborne polymers like acrylics or polyurethanes?
A: Yes, ST-5870 demonstrates good compatibility with many waterborne acrylic emulsions and anionic polyurethane dispersions. Blending can help balance flexibility, hardness, and drying speed—though formulation testing is recommended to confirm stability and film performance under specific processing conditions.
Q4: What are the key handling and storage recommendations for this resin?
A: Store in tightly sealed containers at temperatures between 5 °C and 35 °C, away from freezing and direct sunlight. Avoid prolonged exposure to high humidity during handling. Prior to use, stir gently to ensure homogeneity—do not subject to high-shear mixing unless validated in your system.
Q5: Is ST-5870 suitable for heat-cured or ambient-cured coating systems?
A: ST-5870 is formulated for both ambient-cured and forced-dry applications. It achieves acceptable through-cure at room temperature over several days but delivers optimal mechanical and chemical resistance when baked—typically within the range of 100–140 °C for 15–30 minutes, depending on film thickness and co-resin selection.
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