<p>A polymerizable Norrish Type Il photoinitiator according to Formula (I) wherein groups A, L, R1andR2 are as specified in claim 1 and radiation curable compositions and inkjet inks containing it are disclosed exhibiting improved compatibility with and solubility in radiation curable compositions and injet inks, and exhibiting low extractable amounts of the photoinitiator and its residues after curing.</p>
