Patent ID: 7883826

Claim:
A method of making an imaged element comprising: A) imagewise exposing a negative-working imagable element having a hydrophilic substrate having thereon an imagable layer to imaging radiation having a maximum wavelength of from about 700 to about 1200 nm to form exposed and non-exposed regions in the imaged imagable layer, and B) with or without a preheat step, developing said imagewise exposed element off-press using an aqueous alkaline or organic solvent-containing developer having a pH of at least 6.5, a plate cleaner, or heated aqueous developer consisting essentially of water, to remove only said non-exposed regions of the imaged imagable layer, said negative-working imagable element being sensitive to radiation at a wavelength of from about 700 to about 1200 nm, and comprising the hydrophilic substrate having a hydrophilic surface and having thereon the imagable 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 said imaging radiation, and a polymeric binder that has a hydrophobic backbone and pendant salt groups that comprise a cation covalently attached to said hydrophobic backbone and a boron-containing anion forming a salt with said cation.