I would like to ask why to UV-coatings (radical and cationic curable), the adhesives and lacquers (water- and solvent-based) have poor adhesion?
I tried to raise the polarity of the UV-coatings by adding acrylic acid, but the adhesion of adhesives and lacquers to the UV-coatings does not improve.
Even to "pure" UV-coating, obtained only from Trimethylolpropane trimethacrylate + photoinitiator (without any other additives), the adhesion of adhesives and lacquers is again too poor.
Is there any explanation for this rather strange for me phenomenon?
Thank you in advance!
Adhesion of adhesives and lacquers to UV-coatings
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