Patent ID: 8088549

Claim:
A positive-working, infrared radiation-sensitive imageable element that is a lithographic printing plate precursor that comprises a substrate, and having thereon: an imageable layer comprising an aqueous alkaline developer soluble polymeric binder, a developability-enhancing compound, and an infrared radiation absorbing compound, wherein said developability-enhancing compound is an organic compound having at least one amino group and at least one carboxylic acid group, wherein the at least one amino group is directly linked to an aryl group, wherein the aqueous alkaline developer soluble polymeric binder is a poly(vinyl acetal) that comprises at least 10 and up to 60 mol % of recurring units represented by the following Structure (PVAc), based on total recurring units: wherein R and R′ are independently hydrogen or a substituted or unsubstituted alkyl, substituted or unsubstituted cycloalkyl, or halo group, and R 2 is a substituted or unsubstituted phenol, substituted or unsubstituted naphthol, or substituted or unsubstituted anthracenol group.