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Highly stable saturated polyester backbone ensures excellent hydrolytic resistance and long-term storage stability.
Optimized for ambient-cure and low-bake powder coating systems, delivering consistent film formation and smooth surface finish.
Low viscosity profile enables excellent flow and leveling without excessive solvent demand or viscosity modifiers.
Compatible with standard triglycidyl isocyanurate (TGIC) and hydroxyalkylamide (HAA) curing agents for robust crosslinking.
Low volatile organic compound (VOC) content supports compliance with stringent environmental regulations for industrial coatings.
Architectural metal cladding and curtain wall coatings requiring weather resistance and color retention.
Appliance finishes for refrigerators, ovens, and washing machines demanding durability and gloss consistency.
Outdoor furniture and garden equipment coatings exposed to UV, moisture, and temperature cycling.
Automotive non-critical exterior trim components where high-gloss, chip-resistant finish is essential.
General industrial maintenance coatings for steel structures and fabricated metal parts.
| Chemical Type | Saturated polyester resin |
| Product Form | Free-flowing white to off-white granular solid |
| Appearance | Homogeneous granules, free from lumps or discoloration |
| Acid Value (mg KOH/g) | 25–35 |
| Gardner Color (10% in MIBK) | ≤ 2 |
| Melt Viscosity (180°C, Pa·s) | 4–7 |
| Softening Point (°C, ASTM E28) | 68–74 |
| Moisture Content (wt%, ASTM D1644) | ≤ 0.3 |
Q1: What is the primary application of Setamine US 138 BB-70 in coating systems?
A: Setamine US 138 BB-70 is a saturated polyester resin specifically designed as a crosslinker for high-performance thermosetting powder coatings, particularly in decorative and functional finishes for metal substrates such as appliances, furniture, and architectural components.
Q2: How does Setamine US 138 BB-70 differ from unsaturated polyester resins?
A: Unlike unsaturated polyesters, Setamine US 138 BB-70 contains no carbon–carbon double bonds and is fully saturated, offering superior UV stability, reduced yellowing upon thermal curing, and improved chemical resistance—making it suitable for outdoor and long-life coated products.
Q3: What type of curing chemistry is required for this resin?
A: Setamine US 138 BB-70 is formulated to react with melamine-formaldehyde or glycoluril-based crosslinkers under standard powder coating cure conditions (typically 180–200 °C for 10–20 minutes), delivering excellent flow, gloss retention, and mechanical film properties.
Q4: Is Setamine US 138 BB-70 compatible with common powder coating resins like TGIC-free alternatives?
A: Yes, it demonstrates good compatibility with standard carboxyl-functional acrylics and polyesters used in TGIC-free and HAA-cured systems, supporting formulation flexibility while maintaining storage stability and melt rheology control.
Q5: What handling precautions should be observed during processing?
A: As with most polyester resins, avoid prolonged exposure to moisture and store in a cool, dry environment. During extrusion and grinding, maintain recommended temperature profiles to prevent premature viscosity changes or degradation—consult technical data sheet for optimal processing windows.
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