Patent ID: 7087658

Claim:
A coating system comprising: a) a coating agent comprising two or more photoreactive species and one or more negatively charged groups, the coating agent selected from: i) a conjugated cyclic diketone having attached thereto, either directly or indirectly, one or more substituents comprising negatively charged groups, and wherein each ketone group of the diketone is able to serve as a photoreactive moiety capable of being activated in order to provide a free radical; and ii) a nonpolymeric core molecule having attached thereto, either directly or indirectly, one or more substituents comprising negatively charged groups, and two or more photoreactive species, wherein the photoreactive species are provided as discrete photoreactive groups; wherein the photoreactive species include at least one first photoreactive species able, when activated in the presence of the support surface, to attach the coating agent to the surface, and at least one second photoreactive species able, when activated in the presence of free radical polymerizable groups, to initiate polymerization of those groups, the second photoreactive species being able, in the absence of such free radical polymerizable groups, to revert to a latent reactive state, and wherein the photoreactive species are independently aryl ketones; and b) a plurality of molecules bearing free radical polymerizable groups.