Patent ID: 7326521

Claim:
A method of providing an imaged and developed element comprising: A) using a laser, imagewise exposing a negative-working imageable element comprising a substrate having thereon an imageable layer to provide exposed and non-exposed regions, said imageable layer comprising: a free radically polymerizable component, an 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 an aqueous solution soluble polymeric binder, and B) contacting said imagewise exposed element with a single-phase developer to remove only said non-exposed regions to provide a developed element, wherein said developer has a pH from about 6 to about 10 and comprises: a) an amphoteric surfactant comprising a nitrogen-containing heterocycle, b) an amphoteric surfactant having two or more nitrogen atoms, or c) an amphoteric surfactant of a) and an amphoteric surfactant of b), wherein said imagewise exposing is carried out using imaging radiation from a laser having, a λ max of from about 650 to about 1400 nm, and said 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 independently alkyl, aryl, alkenyl, alkynyl, cycloalkyl, or heterocyclyl groups, or two or more of R 1 , R 2 , R 3 , and R 4 can be joined together to form a heterocyclic ring with the boron atom.