Patent ID: 8076052
Filing Date: 2011-12-13
Classification: B41C,B41M

Abstract:
1. A positive-working imageable element that is a positive-working lithographic printing plate precursor comprising a substrate having a hydrophilic surface, and having thereon an imageable layer that is soluble in an alkaline developer only after exposure to infrared imaging radiation, the imageable layer comprising a first polymeric binder that is soluble in an alkaline developer upon exposure to imaging radiation, said element further comprising an infrared radiation absorbing compound, wherein said first polymeric binder comprises a backbone to which are attached pendant groups represented by the following Structure (I): wherein R 1 and R 2 are independently hydrogen or alkyl groups having 1 to 8 carbon atoms or aryl groups having 6 or 10 carbon atoms in the carbocyclic ring, L is a direct bond or a linking group having at least 1 carbon atom and optionally one or more nitrogen, oxygen, and sulfur atoms in the linking chain, and X is oxy, thio, or —NR— wherein R is hydrogen or an alkyl group having 1 to 8 carbon atoms or an aryl group having 6 or 10 carbon atoms in the carbocyclic ring.