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Highly reactive aliphatic polyester resin with excellent low-temperature cure performance.
Low viscosity enables easy processing and good fiber wet-out in composite manufacturing.
Outstanding hydrolytic stability and resistance to yellowing under UV exposure.
Compatible with standard free-radical initiators and accelerators used in unsaturated polyester systems.
Designed for solvent-free formulations, supporting VOC-compliant coating and gel coat applications.
Fiberglass-reinforced plastic (FRP) tanks and vessels for chemical storage.
Marine gel coats requiring high gloss retention and weather resistance.
Wind turbine blade matrices demanding consistent mechanical performance and process reliability.
Transportation components including bus and rail interior panels with stringent fire-safety requirements.
| Chemical Type | Aliphatic unsaturated polyester resin |
| Product Form | Liquid, ready-to-use |
| Appearance | Clear to pale yellow viscous liquid |
| Viscosity (25 °C) | 400–600 mPa·s (Brookfield, spindle #3, 60 rpm) |
| Acid Value | 12–16 mg KOH/g |
| Gel Time (100 g, 2% MEKP, 25 °C) | 12–18 minutes |
| Solids Content | 100 wt% (solvent-free) |
| Storage Stability | ≥6 months at ≤25 °C in sealed container |
Q1: What is the primary function of DYNAPOL L 658 in polyester-based coating and ink systems?
A: DYNAPOL L 658 is a low-viscosity, aliphatic polyester resin designed primarily as a reactive binder or rheology modifier. It enhances film formation, improves substrate wetting, and contributes to gloss uniformity and mechanical robustness in thermosetting polyester coatings and UV-curable ink formulations.
Q2: Is DYNAPOL L 658 compatible with common crosslinkers used in coil and can coatings?
A: Yes — it exhibits good compatibility with melamine-formaldehyde resins, blocked isocyanates, and other conventional amino and polyisocyanate crosslinkers widely employed in industrial coil and beverage can coating systems. Compatibility should be verified experimentally under specific cure conditions and formulation pH.
Q3: How does DYNAPOL L 658 influence cure behavior and final film properties?
A: As a reactive polyester, it participates in the crosslinking network, supporting faster development of hardness and chemical resistance during thermal cure. Films typically show improved flexibility, mar resistance, and adhesion to metal substrates compared to systems without this resin.
Q4: Can DYNAPOL L 658 be used in low-VOC or high-solids coating formulations?
A: Yes — its low inherent viscosity and high solids content enable efficient formulation of high-solids systems. It supports VOC reduction strategies without compromising flow, leveling, or crosslink density when integrated into optimized resin blends.
Q5: What are typical handling and storage recommendations for DYNAPOL L 658?
A: Store in tightly sealed containers in a cool, dry, and well-ventilated area away from direct sunlight and heat sources. Avoid prolonged exposure to moisture or strong oxidizing agents. Prior to use, ensure containers are properly mixed to maintain homogeneity, especially after extended storage.
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E-mail: wangxingqiang@ericwchem.com
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Building A1, Jiete Industrial Park, Huangpu District, Guangzhou City, Guangdong Province, China
