Patent ID: 8221960

Claim:
A method of providing an image comprising: A) thermally imaging a negative-working imageable element to provide an imaged element with exposed regions and non-exposed regions, said exposed regions consisting essentially of coalesced core-shell particles, and B) developing said imaged element on-press to remove only said non-exposed regions using a lithographic printing ink, fountain solution, or both, said imageable element comprising a hydrophilic substrate, and having thereon a single thermally-sensitive imageable layer consisting essentially of an infrared radiation absorbing compound and core-shell particles that coalesce upon thermal imaging, wherein the core of said core-shell particles is composed of a hydrophobic thermoplastic polymer, the shell of said core-shell particles is composed of a hydrophilic polymer that is covalently bonded to said core hydrophobic thermoplastic polymer, wherein said thermally-sensitive imageable layer comprises less than 10 weight % of free polymer, and the shell of said core-shell particles has an average thickness of from about 1 to about 10 nm and comprises from about 5 to about 25% of the volume of said core-shell particles, on average, and said core has an average size of from about 20 to about 120 nm.