Polymeric material, containing a latent acid

Polymeric material, containing a latent acid, which can be converted to an acid by irradiation by a laser, and 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,
• R1 is hydrogen, alkyl, alkenyl, aryl,
• R2, R3, R4 and R5 independently of each other are hydrogen or a functional substituent, and
• R stands for C1-C6alkyl, -Z1-Q1, or -Z2-Q2,
• wherein Z1 is a single bond, S, NH or O, and Q1 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 C1-C4alkyl or
• hydroxy, mercaptobenzoxazole, mercaptobenzthiazole,
• and wherein Z2 stands for C1-C4alkylene, which can be substituted by C1-C4alkyl or Q3,
• wherein Q3 stands for phenyl which can be substituted one to three times with C1-C4alkyl, hydroxy, C5-C8cycloalkyl 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 Q2 stands for phenyl which can be substituted one to three times with C1-C4alkyl, hydroxy, C5-C8cycloalkyl 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 can be split off by irradiation.