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New opportunities with dual functionality monomers
Dual cure systems based on 2 pack isocyanate coatings (2 K) and UV formulations open up new horizons for formulators since these systems circumvent some of the drawback of 100% UV curing systems such as poor flexibility or lack of adhesion and improve the productivity of 2K systems thanks to the immediate UV processing.
We present dual functionality monomers and oligomers bearing hydroxyl and acrylate groups (partially acrylated polyols) allowing the formation and crosslinking of interpenetrating polymer network (IPN´s) between the acrylates and the polyurethane networks. To the opposite of simple blends of conventional acrylates monomers/oligomers and 2 pack isocyanate formulations, even non-UV exposed areas are crosslinked and film forming using these dual functionality monomers and oligomers. Compared to highly viscous partial acrylate isocyanates, these partial acrylated polyols have lower viscosity and allow the formulation of high solid formulations suitable for spray application.
These new high solid systems can address the severe technical demands for new applications of the radiation curing technology such as exterior and interior applications for various end uses in original equipment manufacturer (OEM), car refinishes, plastic coatings or coatings for 3D and complex shapes with shadow areas (non UV exposed). Accelerated weathering evaluation (QUV-A) was performed for these UV dual cured coatings and compared to conventional solvent borne 2 pack isocyanate coatings.
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