Photoinitiators for Curing White Coatings

摘要

Research in our laboratories has resulted in the development of photo initiator blends for curing white coatings. These blends were found to exhibit excellent efficiency for curing white coatings. It was found that partial replacement of the phosphine oxide type initiator in these blends by 2 -isopropyl thioxanthone results in higher cure speeds. When such a replacement is done, it was found that it is not necessary to add an amine synergist to the formulation. Curing the formulations without any added amine yielded films with lower yellowness. It was found that using the Fusion "V" bulb for curing the formulations resulted in nearly tripling of the cure speeds. The studies show that one of the blends reported in conjunction with the Fusion "V" bulb will be ideal for curing white coatings.