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High chemical resistance to solvents, acids, and alkalis in cured coatings.
Excellent weathering stability and UV resistance for long-term outdoor performance.
Low viscosity enabling high solids formulation with reduced VOC emissions.
Good compatibility with melamine-formaldehyde crosslinkers for thermoset powder and liquid coatings.
Consistent batch-to-batch reproducibility meeting stringent industrial quality requirements.
Automotive OEM and refinish clearcoats and basecoats.
Industrial maintenance coatings for metal substrates.
Architectural aluminum extrusion and coil coatings.
High-performance appliance finishes (e.g., refrigerators, washing machines).
Powder coating systems requiring superior flow, leveling, and edge coverage.
| Chemical Type | Saturated polyester resin |
| Product Form | Liquid, solvent-based solution |
| Appearance | Clear, pale yellow to colorless liquid |
| Primary Applications | Thermoset coatings, powder and liquid crosslinkable systems |
| Key Features | High reactivity with amino resins, low Tg, excellent film formation |
| Benefits | Enhanced durability, gloss retention, and mechanical flexibility |
| Recommended Crosslinker | Highly methylated melamine-formaldehyde resins |
| Storage Conditions | Store in sealed containers at 15–25 °C; avoid freezing and prolonged exposure to moisture |
Q1: What is the primary application area for DYNAPOL LH 898?
A: DYNAPOL LH 898 is specifically designed as a high-performance saturated polyester resin for use in solvent-based and high-solids coil coating systems, where excellent gloss retention, weather resistance, and substrate adhesion are required.
Q2: Is DYNAPOL LH 898 suitable for food-contact applications?
A: DYNAPOL LH 898 is not pre-qualified for direct food contact. Its suitability for such applications depends on final formulation, processing conditions, and regulatory review by the end-user — Evonik recommends thorough compliance assessment with applicable regional food contact regulations before use.
Q3: How does DYNAPOL LH 898 differ from unsaturated polyester resins?
A: Unlike unsaturated polyesters, DYNAPOL LH 898 contains no carbon–carbon double bonds in its backbone, resulting in inherently higher chemical stability, improved UV resistance, and reduced susceptibility to yellowing — making it especially well-suited for demanding exterior coil coating applications.
Q4: What curing agents are typically used with this resin?
A: DYNAPOL LH 898 is formulated to react efficiently with melamine-formaldehyde crosslinkers, particularly high-alkylated types, under standard coil coating cure schedules (e.g., 220–250 °C for short dwell times). Compatibility with alternative amino resins or blocked isocyanates should be verified experimentally.
Q5: Can DYNAPOL LH 898 be blended with other polyester or acrylic resins?
A: Yes, DYNAPOL LH 898 exhibits good compatibility with many conventional polyester and acrylic resins commonly used in coil coatings, enabling formulators to tailor performance attributes such as flexibility, hardness, and flow — however, blend stability and film properties should be confirmed through laboratory evaluation.
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