Single- and multi-layer positive-working imageable elements include a first polymeric binder that is soluble in an alkaline developer upon exposure to imaging radiation and a radiation absorbing compound. The first polymeric binder comprises a backbone to which are attached pendant groups represented by the following Structure (I): ##STR00001## wherein R.sup.1 and R.sup.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.