Patent ID: 7824840

Claim:
A positive-working imageable element comprising a radiation absorbing compound and a substrate having a hydrophilic surface, and having on said substrate, in order: an inner layer composition comprising from about 60 to about 95 weight % of a polymeric binder, based on the dry total inner layer composition weight, and an ink receptive outer layer, provided that upon thermal imaging, the exposed regions of said element are removable by an alkaline developer, wherein said polymeric binder has an acid number of at least 40 and consists essentially of the recurring units consisting of the recurring units represented by the following Structure (I): -(A) w -(B) x -(C) y -(D) z- (I) wherein A represents recurring units derived from one or more N-alkoxymethyl (alkyl)acrylamides or alkoxymethyl (alkyl)acrylates, B represents recurring units derived from one or more ethylenically unsaturated polymerizable monomers having a pendant cyano group, C represents recurring units derived from one or more ethylenically unsaturated polymerizable monomers having one or more carboxy, sulfonic acid, or phosphate groups, D represents recurring units derived from one or more ethylenically unsaturated polymerizable monomers that are represented by Structures (D1) through (D5) shown below, w is from about 3 to about 80 weight %, x is from about 10 to about 85 weight %, y is from about 2 to about 80 weight %, and z is from about 10 to about 85 weight %, wherein R 1 and R 2 are independently hydrogen or alkyl, alkenyl, phenyl, halo, alkoxy, acyl, or acyloxy groups, or R 1 and R 2 together can form a cyclic ring with the carbon atom to which they are attached, R 3 and R 4 are independently hydrogen or alkyl, phenyl, or halo groups, R 5 is an alkyl, alkenyl, cycloalkyl, or phenyl group, R 6 through R 9 are independently hydrogen or alkyl, alkenyl, phenyl, halo, alkoxy, acyl, or acyloxy groups, and R 10 is hydrogen or an alkyl, phenyl, or hydroxy group.