Patent ID: 8900798
Filing Date: 2014-12-02
Classification: B41C,G03F

Abstract:
1. An on-press developable, negative-working, infrared radiation-sensitive lithographic printing plate precursor comprising a substrate and having thereon an imageable layer comprising: a free radically polymerizable component, an initiator composition capable of generating free radicals upon exposure to infrared radiation, which initiator composition comprises an electron acceptor and a co-initiator that is capable of donating electrons, a polymeric binder, a first infrared radiation absorbing compound that has a tetraaryl pentadiene chromophore, and a second infrared radiation absorbing compound that is different than the first infrared radiation absorbing compound, wherein the first infrared radiation absorbing compound is an infrared radiation absorbing dye that is represented by the following Structure DYE-III: wherein Alk represents the same or different alkyl groups having 1 to 7 carbon atoms, A represents hydrogen or the same or different substituted or unsubstituted lower alkyl group having 1 to 3 carbon atoms or the same or different dialkylamino groups, and X wherein the molar ratio of the first infrared radiation absorbing compound to the second radiation absorbing compound is at least 1:2 and up to and including 1:4.