Patent ID: 8084182
Filing Date: 2011-12-27
Classification: B41C,B41M,G03F

Abstract:
1. A negative-working, on-press developable imageable element comprising a substrate having thereon an imageable layer comprising: a radically polymerizable component, an initiator composition capable of generating free radicals sufficient to initiate polymerization of free radically polymerizable groups upon exposure to imaging infrared radiation, a primary polymeric binder that has a backbone to which are attached pendant poly(alkylene oxide) side chains, cyano groups, or both, and is optionally present in the form of discrete particles, and an infrared radiation absorbing dye that upon exposure to thermal irradiation, changes from colorless to a visible color or from one visible color to another visible color, providing a ΔE of at least 5 between the exposed and non-exposed regions of said imageable layer within 3 hours of its exposure to 300 ml/cm wherein ΔE=(ΔL* wherein the infrared radiation absorbing dye comprises a cyanine dye chromophore that is represented by the following Structure (CHROMOPHORE): wherein Q Z represents the additional carbon atoms needed to provide a 5- to 7-membered carbocyclic ring, Z R