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Highly crosslinkable for excellent chemical and solvent resistance in cured coatings.
Low viscosity enables easy formulation and high solids content without excessive solvents.
Outstanding gloss retention and color stability under UV exposure and weathering conditions.
Excellent compatibility with common amino crosslinkers (e.g., melamine-formaldehyde) for thermoset powder and liquid coatings.
Consistent batch-to-batch reproducibility meeting stringent quality control standards for industrial coating systems.
Architectural metal coatings for façades, roofing, and cladding systems.
Appliance coatings for refrigerators, washing machines, and ovens.
Automotive exterior trim and non-structural components.
General industrial maintenance and protective coatings for steel structures.
Powder coating formulations requiring high durability and aesthetic performance.
| Chemical Type | Saturated polyester resin (carboxyl-functional) |
| Product Form | Pale yellow to light amber viscous liquid |
| Appearance | Clear to slightly hazy, homogeneous liquid at 25°C |
| Acid Value (mg KOH/g) | 28–34 |
| Hydroxyl Value (mg KOH/g) | 10–16 |
| Viscosity @ 25°C (mPa·s) | 4,000–7,000 |
| Softening Point (°C) | 45–55 |
| Primary Applications | Thermoset powder coatings, high-performance liquid coatings |
Q1: What is the primary application of Uralac SN844 in powder coating formulations?
A: Uralac SN844 is specifically designed as a low-viscosity, high-reactivity saturated polyester resin for TGIC-free and HAA-based polyester–polyurethane hybrid powder coatings, commonly used in architectural, appliance, and general industrial applications requiring excellent flow, gloss retention, and weather resistance.
Q2: How does Uralac SN844 contribute to film formation and curing performance?
A: Its optimized acid value and molecular weight distribution support rapid crosslinking with common curing agents, enabling efficient full-cure at standard industrial bake schedules (e.g., 180–200 °C for 10–20 minutes), while delivering smooth, pinhole-free films with good mechanical properties and substrate adhesion.
Q3: Is Uralac SN844 compatible with standard powder coating additives and pigments?
A: Yes — it demonstrates broad compatibility with conventional flow modifiers, degassing agents, benzoin alternatives, and both organic and inorganic pigments. Formulators should verify stability and dispersion behavior during extrusion and post-addition steps based on specific pigment loadings and additive chemistries.
Q4: What are the recommended storage conditions to maintain resin integrity?
A: Store in original sealed containers in a cool, dry, and well-ventilated area, protected from direct sunlight and moisture. Avoid prolonged exposure to temperatures above 35 °C or repeated freeze–thaw cycles to preserve reactivity and viscosity stability.
Q5: Can Uralac SN844 be used in indoor and outdoor powder coating systems?
A: Yes — its saturated backbone provides inherent hydrolytic stability and UV resistance, making it suitable for both interior applications (e.g., office furniture, HVAC components) and exterior-grade coatings (e.g., façade elements, garden equipment), particularly when formulated with appropriate stabilizers and pigments.
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E-mail: wangxingqiang@ericwchem.com
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