Patent ID: 8198011

Claim:
A method of making an imaged element comprising: A) imagewise exposing a positive-working imageable element using an energy of less than 300 mJ/cm 2 to provide exposed and non-exposed regions, and B) developing said imagewise exposed element with an alkaline, silicate-free solution having a pH of from 9.5 to 11 and containing a carbonate to remove predominantly only said exposed regions to provide an image in said exposed and developed element, wherein said carbonate-containing solution comprises at least 0.5 and up to 5 weight % carbonate ion, said imageable element comprising a substrate and a radiation absorbing compound, and having on said substrate, an imageable layer comprising a developability-enhancing compound and a poly(vinyl acetal) having recurring units represented by the following Structure (Ic) in an amount of at least 35 and up to and including 70 mol % of all recurring units in the polymer, and recurring units represented by the following Structure (Id) in an amount of from 0 and up to and including 30 mol % of all recurring units in the polymer, wherein R and R′ are independently hydrogen or a substituted or unsubstituted alkyl, substituted or unsubstituted cycloalkyl, or halo group, R 3 is a nitro-substituted phenol, nitro-substituted naphthol, or nitro-substituted anthracenol group, and R 4 is a substituted or unsubstituted alkyl, substituted or unsubstituted cycloalkyl, or substituted or unsubstituted aryl group.