Patent ID: 8084189
Filing Date: 2011-12-27
Classification: B41C,G03F,Y10S

Abstract:
1. A method of making an imaged element comprising: A) imagewise exposing an infrared radiation-sensitive positive-working imageable element comprising a substrate and an infrared radiation-sensitive compound, and having on said substrate an imageable layer that comprises a developability-enhancing compound and a poly(vinyl acetal) in which at least 25 mol % of its recurring units comprise pendant nitro-substituted phenolic groups, to imaging radiation at a wavelength of from about 700 to about 1400 nm to provide exposed and non-exposed regions, and B) applying a single processing solution having a pH of from about 9 to about 11.5 to said imagewise exposed element both: (1) to remove predominantly only said exposed regions, and (2) to provide a protective coating over all of said non-exposed and exposed regions of the resulting lithographic printing plate, said single processing solution comprising a carbonate and at least 1 weight % of one or more anionic surfactants.