Patent ID: 7230121

Claim:
Sulfonium salts of the general formula (I): wherein: n is 1 or 2; X is selected from: S, O, CH 2 , CO, single bond, N—R wherein R is H, or alkyl or aryl; Y 1 and Y 2 are equal or different and are selected from: H, C 1 -C 6 linear or branched alkyl, cycloalkyl, O-alkyl, hydroxyl, halogen, S-alkyl, S-aryl; Z − is a group of the general formula MQ p wherein M is B, P, As, or Sb; Q is F, Cl, Br, I, or perfluorophenyl; p is an integer from 4 to 6; A is a functional group of the general formula (II): carrying two or three sulfonium salts units, wherein: m is 1 or 2; R 1 -R 9 are equal or different and are selected from: single bond, H, halogen atom (F, Cl, Br, I), nitro, C 1 -C 6 linear or branched alkyl, C 1 -C 6 linear or branched alkoxyl, S—C 1 -C 6 linear or branched alkylthio, with the proviso that at least one of R,—R 5 is H; when m=1, B is selected from: O; S; SO;SO 2 ; CH 2 ; single bond; NR (wherein R is H, C 1 -C 6 linear or branched alkyl); C 1 -C 18 linear or branched alkylene carrying at its ends two heteroatoms, equal or different, selected from O, S, N—R the alkylene 15 being eventually substituted with C 1 -C 6 linear or branched hydroxyalkyl, C 1 -C 6 linear or branched mercaptoalkyl, hydroxyl, amino or aminoalkyl; an alicyclic group containing two nitrogen atoms in the ring, the alicyclic group being eventually substituted with OH, NH 2 , C 1 -C 6 linear or branched aminoalkyl; when m=2, B is selected from N; a C 3 -C 18 linear or branched alkyl carrying three heteroatoms, equal or different selected from O, S, N—R, the alkyl being eventually substituted with C 1 -C 6 hydroxyalkyl, C 1 -C 6 mercaptoalkyl, hydroxyl, amino or aminoalkyl; an alicyclic group with three N in the ring, the alicyclic group being eventually substituted with OH, NH 2 , C 1 -C 6 linear or branched aminoalkyl.