Excellent surfaces at low-curing temperatures Polyurethanes for automotive plastic topcoats
The interiors and exteriors of trucks and cars feature many plastic parts. Depending on where the parts are located and what types of plastics are used, they may be protected with a variety of coating layers. Polyurethane (PU) systems provide a long-lasting, high-quality finish regardless of the number of layers.
Automotive topcoats based on PU resins
Once coated, the color and appearance of plastic automotive parts must match the vehicle’s coated metal – even though the substrates have different properties.
Automotive plastic topcoat systems can consist of a single coat or as many as three layers (primer, basecoat and topcoat). They are pigmented systems and influence the color and appearance of automotive plastic coatings.
By controlling the chemistry of the hard and soft segments, the PU is customizable. PU automotive plastic topcoats can be as flexible or stiff as needed and are compatible with special fillers, pigments and matting agents used to make automotive finishes.
Covestro’s broad range of PU resins are used in one- (1K) and two- (2K) component solventborne (
Desmodur®, Desmophen®) and waterborne (Desmodur®, Bayhydur®, Bayhydrol®) OEM plastic topcoats. UV-curable waterborne polyurethane dispersions (Bayhydrol® UV) are also available for applications where immediate curing, low volatile organic compound (VOC) content and high-quality automotive topcoats are required.
Automotive topcoats based on our PU resins provide excellent protection and superior appearance properties for interior and exterior applications.
In exterior applications, weathering resistance and low-temperature flexibility are key.
Other coating properties, including design considerations (high gloss or matte, hard or soft) and resistance to lotions, insect repellents and other staining fluids, are more important in auto interior applications. Interesting soft-touch effects can be created with polyurethane OEM topcoats to provide a comfortable, luxurious and warm feel.
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