Patent ID: 8003297

Claim:
Polymeric material containing: (i) a latent acid, wherein the latent acid is converted to an acid by irradiation by a laser; and (ii) optionally further ingredients, wherein the latent acid is of formula wherein the ring A can contain one or more hetero atoms and/or can contain an anelated ring, R 1 is hydrogen, alkyl, alkenyl, aryl, R 2 , R 3 , R 4 and R 5 independently of each other are hydrogen or a functional substituent, and R stands for C 1 -C 8 alkyl, —Z 1 -Q 1 , or —Z 2 -Q 2 , wherein Z 1 is a single bond, S, NH or O, and Q 1 is a heterocyclic ring system having from 5 to 9 ring atoms selected from C, S, O and N, with at least 2 carbon atoms in the ring system, which may be substituted one to three times with C 1 -C 4 alkyl or hydroxy, mercaptobenzoxazole, mercaptobenzthiazole, and wherein Z 2 stands for C 1 -C 4 alkylene, which can be substituted by C 1 -C 4 alkyl or Q 3 , wherein Q 3 stands for phenyl which can be substituted one to three times with C 1 -C 4 alkyl, hydroxy, C 5 -C 8 cycloalkyl and/or a heterocyclic ring system having from 5 to 9 ring atoms selected from C, S, O and N, with at least 2 carbon atoms in the ring system, and Q 2 stands for phenyl which can be substituted one to three times with C 1 -C 4 alkyl, hydroxy, C 5 -C 8 cycloalkyl and/or a heterocyclic ring system having from 5 to 9 ring atoms selected from C, S, O and N, with at least 2 carbon atoms in the ring system, with the proviso that the hydrogen atom at the C-atom in α-position to R is split off by irradiation.