Polyester Powder Coating Systems

Saturated polyester resins form the backbone of modern powder coating formulations. By precisely controlling functionality and backbone structure, coatings can achieve excellent flow, impact resistance, gloss retention and UV durability.

• TGIC Cured Systems: Exterior durable architectural coatings
• HAA (Primid) Systems: Low toxicity, environmentally preferred systems
• Hybrid Epoxy-Polyester Systems: Interior industrial coatings
• Super Durable Polyester Systems: Enhanced UV stability for facade applications

Polyurethane (PU) Powder Coatings

Polyurethane powder coatings are premium-performance systems formulated using hydroxyl-functional polyester resins reacted with blocked isocyanate curing agents. During baking, the isocyanate deblocks and reacts with the polyester backbone, forming a highly crosslinked urethane network.

These systems are selected where superior exterior durability, chemical resistance and smooth surface finish are required. Compared to standard polyester systems, PU powders offer enhanced resistance to solvents, fuels, cleaning agents and environmental exposure.

• Curing Mechanism: Hydroxyl-functional polyester + blocked isocyanate
• Cure Profile: Typically 160–200°C metal temperature depending on system
• Performance Benefit: Excellent gloss retention and UV stability
• Chemical Resistance: Superior resistance to oils, fuels and detergents
• Surface Finish: Smooth flow, low orange peel and high DOI

Typical Applications

• Architectural aluminum extrusions
• High-end outdoor furniture
• Automotive components
• Industrial machinery housings
• Appliance exterior panels

By controlling hydroxyl value, molecular weight and backbone composition, Enviol Polytech Solutions can tailor polyester polyols and saturated polyester resins specifically for polyurethane powder coating performance requirements.

Coil Coating Polyester Systems

Saturated polyester resins are widely used in liquid coil coating applications for pre-coated metal sheets. These systems require precise molecular weight control to balance flexibility, adhesion and weather resistance during high-speed continuous processing.

• Architectural metal roofing and facades
• Pre-painted galvanized steel
• Appliance and white goods panels

Can Coating Polyester Systems

Saturated polyester resins are widely used in metal packaging coatings for beverage and food cans. These systems are applied via high-speed coil coating or spray processes and must deliver exceptional flexibility, adhesion and chemical resistance.

Can coatings are engineered to withstand forming operations, pasteurization or sterilization cycles, and long-term contact with beverages, oils and acidic food products without film cracking or loss of adhesion.

Performance Requirements

• High Flexibility: Resistance to cracking during deep drawing
• Adhesion Strength: Strong bonding to aluminum and tinplate
• Chemical Resistance: Protection against acids, alcohols and oils
• Thermal Stability: Withstand sterilization temperatures
• Regulatory Compliance: Designed for food-contact applications

By precisely controlling acid value, molecular weight and backbone chemistry, Enviol Polytech Solutions can formulate saturated polyester resins optimized for high-performance can coating systems.

Industrial Application Coverage

• Architectural aluminum extrusions
• Steel structures and fabricated components
• Automotive metal parts
• Appliance and white goods housing
• Metal furniture and fixtures
• Infrastructure and construction materials