Novel crosslinking additive for chemical resistant UV-curable clearcoats
Allyl-functionalized triazines, especially TAICROS® were used as crosslinking additives in novel UV-curing clear coats. It could be evidenced that TAICROS®, as a key component in the radiation curing formulations, has a positive effect on important properties like acid- and alkaline resistance, adhesion, hardness and scratch-resistance. The UV-curing clear coats were protected by the addition of hindered amine light stabilizers (HALS), as well as UV-absorbers and applied on state of the art OEM systems, consisting of e-coat, primer surfacer and base coat layers. Finally, UV-curing clear coats, which can be regarded as starting formulations, to adapt the mechanical and adhesion properties to the existing automotive coating systems on the market, were established.