A curable precursor of a pressure sensitive adhesive comprising: a) a (co)polymeric material comprising the reaction product of a (co)polymerizable material comprising a (meth)acrylate ester monomer; b) a polyfunctional aziridine curing agent comprising at least two aziridine functional groups; and c) an acid generating agent selected from the group consisting of thermal acid generating agents, photo acid generating agents, and any combinations or mixtures thereof; and wherein the photo acid generating agent is selected from the group consisting of ionic salts of organometallic complexes, iodonium or sulfonium salts and any combinations or mixtures thereof; and wherein the polyfunctional aziridine curing agent has the following formula: wherein R 4 is a (hetero)hydrocarbyl group having a valency of y; R 2 is an H or C 1 -C 12 alkyl group, C 1 -C 8 alkyl group, C 1 -C 6 alkyl group, C 1 -C 4 alkyl group, C 1 -C 2 alkyl group, C 6 -C 12 aromatic group, C 6 -C 10 aromatic group, or even C 6 -C 7 aromatic group; y is 2 to 3; x is 0, 1 or 2; and each of a and b are independently 0 to 6, 0 to 4, or even 0 to 2; or, the following formula: wherein R 4 is a (hetero)hydrocarbyl group having a valency of y; R 5 and R 6 are independently (hetero)hydrocarbyl groups; R 2 is an H or C 1 -C 12 alkyl group, C 1 -C 8 alkyl group, C 1 -C 6 alkyl group, C 1 -C 4 alkyl group, C 1 -C 2 alkyl group, C 6 -C 12 aromatic group, C 6 -C 10 aromatic group, or even C 6 -C 7 aromatic group; y is 2 to 3; x is 0, 1 or 2; and each of a and b are independently 0 to 6, 0 to 4, or even 0 to 2 or the following formula: wherein R 4 is a (hetero)hydrocarbyl group having a valency of y; R 7 is a (hetero)hydrocarbyl group; R 2 is an H or C 1 -C 12 alkyl group, C 1 -C 8 alkyl group, C 1 -C 6 alkyl group, C 1 -C 4 alkyl group, C 1 -C 2 alkyl group, C 6 -C 12 aromatic group, C 6 -C 10 aromatic group, or even C 6 -C 7 aromatic group; y is 2 to 3; x is 0, 1 or 2; and a is 0 to 100, 1 to 50, 1 to 20 or even 1 to 10. a) a (co)polymeric material comprising the reaction product of a (co)polymerizable material comprising a (meth)acrylate ester monomer; b) a polyfunctional aziridine curing agent comprising at least two aziridine functional groups; and c) an acid generating agent selected from the group consisting of thermal acid generating agents, photo acid generating agents, and any combinations or mixtures thereof; and wherein the photo acid generating agent is selected from the group consisting of ionic salts of organometallic complexes, iodonium or sulfonium salts and any combinations or mixtures thereof; R 4 is a (hetero)hydrocarbyl group having a valency of y; R 2 is an H or C 1 -C 12 alkyl group, C 1 -C 8 alkyl group, C 1 -C 6 alkyl group, C 1 -C 4 alkyl group, C 1 -C 2 alkyl group, C 6 -C 12 aromatic group, C 6 -C 10 aromatic group, or even C 6 -C 7 aromatic group; y is 2 to 3; x is 0, 1 or 2; and each of a and b are independently 0 to 6, 0 to 4, or even 0 to 2; R 4 is a (hetero)hydrocarbyl group having a valency of y; R 5 and R 6 are independently (hetero)hydrocarbyl groups; R 2 is an H or C 1 -C 12 alkyl group, C 1 -C 8 alkyl group, C 1 -C 6 alkyl group, C 1 -C 4 alkyl group, C 1 -C 2 alkyl group, C 6 -C 12 aromatic group, C 6 -C 10 aromatic group, or even C 6 -C 7 aromatic group; y is 2 to 3; x is 0, 1 or 2; and each of a and b are independently 0 to 6, 0 to 4, or even 0 to 2 R 4 is a (hetero)hydrocarbyl group having a valency of y; R 7 is a (hetero)hydrocarbyl group; R 2 is an H or C 1 -C 12 alkyl group, C 1 -C 8 alkyl group, C 1 -C 6 alkyl group, C 1 -C 4 alkyl group, C 1 -C 2 alkyl group, C 6 -C 12 aromatic group, C 6 -C 10 aromatic group, or even C 6 -C 7 aromatic group; y is 2 to 3; x is 0, 1 or 2; and a is 0 to 100, 1 to 50, 1 to 20 or even 1 to 10.