Patent ID: 8679726

Claim:
A negative-working lithographic printing plate precursor that comprises: a substrate, a negative-working imageable layer disposed over the substrate, the negative-working imageable layer comprising a free radically polymerizable component, an initiator composition that is capable of generating free radicals upon exposure to imaging radiation, a radiation absorber, and a polymeric binder, and an outermost water-soluble overcoat layer that is disposed directly on the negative-working imageable layer, the outermost water-soluble overcoat layer consists essentially of one or more film-forming water-soluble polymeric binders, at least one of which is an acid-modified poly(vinyl alcohol) or a poly(vinyl alcohol) having a saponification degree of at least 70%, and organic wax particles that are polyethylene wax particles or polytetrafluoroethylene wax particles dispersed within the one or more film-forming water-soluble polymeric binders in an amount of at least 1.3 weight % and up to and including 60 weight %, based on the total outermost water-soluble overcoat layer weight, wherein the organic wax particles have an average largest dimension of at least 0.05 μm and up to and including 0.7 μm, as determined from a scanning electron micrographic of the outermost water-soluble overcoat layer, and the ratio of the dry coating coverage of the outermost water-soluble overcoat layer (in g/m 2 ) to the average largest dimension of the organic wax particles (in μm), is greater than 1.1:1.