Patent ID: 8030368

Claim:
A composition comprising a ketone photoinitiator and a reactive substrate selected from the group comprising a polymerizable composition, a cross-linkable composition and a color changing composition, said ketone photoinitiator selected from the group consisting of: 2,2-dimethoxy-2-phenyl acetophenone; 2-methyl-1-[4-(methylthio)phenyl]-2-morpholino propan-1-one; 2-benzyl-2-N,N-dimenthylamino-1-(4-morpholinophenyl)-1-butanone; isopropyl thioxanthone; camphorquinone; [4-(4-methylphenylthio)phenyl]phenylketone; 4-phenyl benzophenone; 2-ethyl anthraquinone; and di-iodobutoxy fluorone; in which the ketone moiety of the ketone photoinitiator is protected by a methylene 1,3 dioxolane ring structure.