Patent ID: 6017673
Filing Date: 2000-01-25
Classification: B41N,G03F

Abstract:
An imaging element for making a lithographic printing plate comprising on one side of a support a photosensitive layer containing a silver halide emulsion and an image receiving layer containing physical development nuclei in water permeable relationship with said photosensitive layer, said imaging element further comprising a hydrophilic amphoteric block copolymer containing (i) a non-ionic acrylic block comprising a sequence of units having pendant nitrile groups according to formula I and (ii) a acrylamid(in)ic block comprising a sequence of units according to formula II, and said hydrophilic amphoteric block copolymer further comprising within said acrylamid(in)ic block(s) units having pendant acidic groups or salts thereof as well as units having pendant basic groups or salts thereof ##STR10## wherein R.sup.1 is hydrogen or an alkyl group; ##STR11## wherein R.sup.2 is hydrogen or an alkyl group, R.sup.3 is hydrogen, an alkyl group or an aryl group and X is O or NH.