1. An IR-sensitive composition comprising: (a) a first polymeric binder which does not comprise acidic groups having a pKa value less than or equal to 8; (b) a second polymeric binder comprising polyether groups; (c) an initiator system comprising: (i) at least one compound capable of absorbing IR radiation selected from triarylamine dyes, thiazolium dyes, indolium dyes, oxazolium dyes, cyanine dyes, polyaniline dyes, polypyrrole dyes, polythiophene dyes and phthalocyanine pigments; (ii) at least one compound capable of producing radicals selected from polyhaloalkyl-substituted compounds; and (iii) at least one polycarboxylic acid represented by the following formula I R 4 —(CR 5 R 6 ) r —Y—CH 2 COOH  (I) wherein Y is selected from the group consisting of O, S and NR 7, each of R 4, R 5 and R 6 is independently selected from the group consisting of hydrogen, C 1 -C 4 alkyl, substituted or unsubstituted aryl, —COOH and NR 8 CH 2 COOH, R 7 is selected from the group consisting of hydrogen, C 1 -C 6 alkyl, —CH 2 CH 2 OH, and C 1 -C 5 alkyl substituted with —COOH, R 8 is selected from the group consisting of —CH 2 COOH, —CH 2 OH and —(CH 2 ) 2 N(CH 2 COOH) 2 and r is 0, 1, 2 or 3, with the proviso that at least one of R 4, R 5, R 6, R 7 and R 8 comprises a —COOH group or salts thereof; and (d) a free radical polymerizable system comprising at least one member selected from unsaturated free radical polymerizable monomers, oligomers which are free radical polymerizable and polymers containing C&boxH;C bonds in the back bone and/or in the side chain groups, wherein the following inequality is met: ox i <red ii &plus;1.6 eV with ox i &equals;oxidation potential of component (i) in eV red ii &equals;reduction potential of component (ii) in eV.