KOBOND™ 4004 — Polyester Adhesion Promoter

Product Overview

KOBOND™ 4004 is a polyester-based additive with multiple anchoring groups and hydroxyl functionality. It promotes coating adhesion to aluminum, zinc, stainless steel and electroplated surfaces. Its hydroxyl groups can participate in suitable resin crosslinking reactions.

Key Features

• Promotes adhesion to difficult metal substrates.
• Hydroxyl groups can participate in resin crosslinking.
• Can improve film flexibility and impact resistance.
• Good compatibility with melamine resin systems, as described in the TDS.

Physical Properties

Selected values from the original TDS. Refer to that document for conditions and whether values are typical or specification limits.

Typical Applications

• Waterborne baking coatings on aluminum, zinc, stainless steel and electroplated surfaces.
• Melamine-cured acrylic, alkyd and polyester coatings.
• Two-component polyurethane coatings.

Technical Considerations

The TDS recommends 0.5–3.0% as supplied, based on the total formulation. Add at any stage of manufacture with adequate stirring and determine the optimum level by application testing. The product is not recommended for air-drying coatings.

Reported properties are typical, not specifications. The TDS states a shelf life of 24 months from production; consult the current SDS and container label for detailed storage and handling requirements.

Related Technical Articles