Positive-working imageable elements have a substrate and an imageable
layer that can be used to prepare lithographic printing plates. The
imageable elements also include a radiation absorbing compound, and a
mixture of first and second polymers in the same imageable layer. The
first polymer has two or more centered H-bonds (hydrogen bonds) within a
non-covalently bonded unit, and the second polymer is a polyvinyl acetal.
This mixture of polymers in the same imageable layer provides improved
solvent resistance and processing latitude without a loss in imaging
speed.