Abstract: Copolymerizable benzophenone photoinitiators of the formula I ##STR1## wherein 1, k=0, 1, 2.R.sub.1 =divalent organic group having 1 to 25 carbon atoms;R.sub.2 =H or methyl; andR.sub.3, R.sub.4 =organic group having 1 to 25 carbon atoms.X, Y=hydrogen, halogen or (C.sub.1 -C.sub.25) groups containing N, S, and/or O;and method of making the photoinitiators.The photoinitiators overcome the leaching problem with prior photoinitiators in radiation curable polymer applications. Radiation curable polymers, cured polymers, and coated articles are also disclosed.