Patent ID: 7524614

Claim:
A radiation-sensitive composition comprising: a free radically polymerizable component, an iodonium borate initiator composition capable of generating radicals sufficient to initiate polymerization of said radically polymerizable component upon exposure to imaging radiation, a radiation absorbing compound, and a polymeric binder, wherein said iodonium borate initiator composition comprises a diaryliodonium borate compound represented by the following Structure (I): wherein X and Y are independently halo, alkyl, alkyloxy, or cycloalkyl groups or two or more adjacent X or Y groups can be combined to form a fused ring with the respective phenyl rings, p and q are independently 0 or integers of 1 to 5, provided that either p or q is at least 1 and the sum of the carbon atoms in the X and Y substituents or fused ring is at least 6, and Z is an organic anion represented by the following Structure (II): wherein R 1 , R 2 , R 3 , and R 4 are the same or different substituted or unsubstituted aryl groups.