German technical background VOK-394 leveling agent For solventborne coil coatings replaces BYK-394

German technical background  VOK-394 leveling agent

VOK-394 Polyacrylate surface additive for solventborne coil coatings and wood and furniture coatings. Improves leveling and tape peelability, contains hydroxyl functional groups.

Chemical composition

Acrylate copolymer solution

Typical physicochemical data

The data presented on this data page is typical and not a product specification.

Density (20 °C): 1.02 g/ml

Non-volatile (10 min., 150 °C): 80 %

Solvent: Dipropylene glycol monomethyl ether

Flash point: 88 °C

Hydroxyl value: 23 mg KOH/g

Special reminder

When using this auxiliary, if recoated, the surface must be carefully sanded with sandpaper to ensure sufficient interlayer adhesion. Application areas

Coatings industry

Features and benefits

VOK-394 can be arranged in a directional manner on the surface of the paint film and cross-linked into the polymer network through its reactive groups.

VOK-394 is suitable for solventborne systems reacting by primary hydroxyl groups and the following binder systems: two-component polyurethane, alkyd/melamine, polyester/melamine, acrylic/melamine, acrylic/epoxy compositions. The non-polar groups of VOK-394 produce good peelability on the paint film surface. The additive improves leveling and gloss and provides a long-wave effect that avoids cratering. VOK-394 has no effect on surface tension and is a thermally stable product.

Recommended Use 

The additive is recommended for solvent-borne, solvent-free baking paints and two-component polyurethane coatings 

Coil coatings 

Wood and furniture coatings

Recommended dosage

0.2-3 % additive dosage (purchased form) is based on total formulation.

The above recommended dosage is for reference, and a good dosage needs to be determined by a series of tests

Addition method and processing guidance

Can be added at any stage, including later.