Imaging element and method for making lithographic printing plate according to the silver salt diffusion transfer process
AssigneeAgfa-Gevaert
InventorsPaul Coppens, Eric Hoes, Ludovicus Vervloet
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Abstract
The present invention provides an imaging element comprising in the order given (i) a hydrophilic base, (ii) an image receiving layer containing physical development nuclei and (iii) a photosensitive layer containing a silver halide emulsion being in water permeable relationship with said image receiving layer, characterized in that said photosensitive layer or another optional layer being in water permeable relationship therewith contains at least one gelatin species whereof a 10% by weight aqueous solution at 36.degree. C. and pH 6 has a viscosity lower than 20 mPa.s at a shearing rate of 1000 s.sup.-1.
Claims8
An imaging element comprising in the order given (i) a hydrophilic base, (ii) an image receiving layer containing physical development nuclei, (iii) an intermediate layer comprising a non-proteinic hydrophilic film-forming polymer or hydrophobic polymer beads having an average diameter not lower than 0.2 .mu.m and having been prepared by polymerization of a ethylenically unsaturated monomer and (iv) a photosensitive layer containing a silver halide emulsion being in water permeable relationship with said image receiving layer, characterized in that said photosensitive layer and/or another optional layer being in water permeable relationship therewith contains at least one gelatin species whereof a 10% by weight aqueous solution at 36.degree. C. and pH 6 has a viscosity lower than 20 mPa.s at a shearing rate of 1000 s.sup.-1 and that at least one gelatin containing layers is coated at a pH value not below its iso-electric point.
Dependencies are inferred from the claim text.