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Highly crosslinkable solid saturated polyester resin with excellent compatibility with melamine and urea-formaldehyde crosslinkers.
Outstanding gloss retention, hardness, and chemical resistance in cured thermoset coatings.
Low melt viscosity enabling smooth film formation and good flow/leveling in powder and high-solids liquid coatings.
Excellent weathering stability and UV resistance due to fully saturated backbone structure.
Consistent batch-to-batch reproducibility meeting stringent automotive and industrial OEM requirements.
Automotive clearcoats and basecoat/clearcoat systems for OEM and refinish applications.
High-performance industrial maintenance coatings for metal furniture, appliances, and agricultural equipment.
Powder coating formulations requiring superior mechanical durability and corrosion protection.
High-solids liquid coil coatings for architectural and industrial metal substrates.
UV-curable hybrid systems where thermal cure compatibility and low shrinkage are critical.
| Chemical Type | Solid saturated linear polyester resin |
| Product Form | Pale yellow to light amber granules or flakes |
| Appearance | Free-flowing, homogeneous solid particles |
| Glass Transition Temperature (Tg) | 62–68 °C (DSC, 10 °C/min) |
| Acid Value | 12–16 mg KOH/g |
| Hydroxyl Value | 45–52 mg KOH/g |
| Molecular Weight (Mn) | 2,800–3,400 g/mol (GPC vs. polystyrene standard) |
| Softening Point | 78–84 °C (Ring & Ball method) |
Q1: What is the primary application area for DYNAPOL L658?
A: DYNAPOL L658 is primarily used as a binder and film-forming component in high-performance powder coatings, especially for architectural, industrial, and appliance applications requiring excellent weather resistance, gloss retention, and mechanical durability.
Q2: How does DYNAPOL L658 differ from unsaturated polyester resins commonly used in powder coatings?
A: Unlike unsaturated polyesters, DYNAPOL L658 is fully saturated, offering superior UV stability and reduced susceptibility to yellowing or chalking upon long-term outdoor exposure—making it especially suitable for premium exterior-grade coatings.
Q3: Is DYNAPOL L658 compatible with standard curing agents used in polyester–TGIC and polyester–HAA systems?
A: Yes, DYNAPOL L658 is formulated for compatibility with common crosslinkers such as triglycidyl isocyanurate (TGIC) and hydroxyalkyl amide (HAA), enabling flexible system design across a range of cure schedules and performance requirements.
Q4: What are the recommended storage conditions to maintain resin integrity?
A: Store in original sealed containers in a cool, dry place away from direct sunlight and sources of heat. Prolonged exposure to elevated temperatures or humidity may affect flow behavior and reactivity during processing.
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E-mail: wangxingqiang@ericwchem.com
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