Patent ID: 6893797

Claim:
An imageable element comprising: a substrate; and an imageable layer comprising an imageable composition over the substrate; the imageable composition comprising: (i) at least one allyl-functional polymeric binder, the allyl-functional polymeric binder comprising about 0.7 to about 8.0 meq of allyl-functionality per gram of polymeric binder; (ii) at least one cyanine dye capable of absorbing infrared radiation; and (iii) at least one free-radical polymerizable compound; and (iv) a free-radical generating system comprising: (a) at least one polyhaloalkyl-substituted compound capable of producing free radicals, and (b) at least one carboxylic acid represented by the formula: in which: R 4 , R 5 , R 6 , R 7 and R 8 are each independently selected from the group consisting of hydrogen, alkyl, aryl, halogen, alkoxy, hydroxyalkyl, carboxy, carboxyalkyl, alkylthio, alkylsulfonyl, sulfonic, alkylsulfonate, dialkylamino, acyl, alkoxycarbonyl, cyano and nitro; or R 4 and R 5 , R 5 and R 6 , R 6 and R 7 , or R 7 and R 8 together form an aromatic or aliphatic ring; R 9 is selected from the group consisting of hydrogen, alkyl, aryl, hydroxyalkyl, carboxyalkyl, acyl, alkoxycarbonyl, alkylsulfonyl and alkylsulfonate; or R 9 is an electron pair; R 10 is an alkylene group of C 1 -C 6 carbon atoms; or R 8 and R 10 together form a heterocyclic ring; or R 9 and R 10 together form a heterocyclic ring, or either R 9 or R 10 forms a heterocyclic ring with R 4 or, R 8 ; and A is a heteroatom selected from the group consisting of N, O, and S; in which the allyl-functional polymeric binder has an acid number of zero.