Patent ID: 7611817

Claim:
An aromatic sulfonium salt compound expressed by a general formula (I), wherein, R 1 to R 17 are identical or different and are a group selected from the group consisting of hydrogen, halogen, nitro, hydroxyl, alkyl, alkoxy, acyl, phenoxy, ester, aryl, thioether, thiocarbonyl, sulfinyl, sulfonyl, amino, amide, imide, nitrile, phosphino, phospho, phosphoryl and fluoroalkyl groups of 1-8 carbon atoms, wherein the moieties other than the functional groups of these groups can be saturated aliphatic hydrocarbon, unsaturated aliphatic hydrocarbon, alicyclic hydrocarbon, carbocyclic aromatic hydrocarbon or heterocyclic aromatic hydrocarbon of 1-12 carbon atoms, and R 5 and R 6 can be condensed together with to form a covalent bond, provided that R 1 to R 5 are not all hydrogen at the same time, and that R 6 to R 10 are not all hydrogen at the same time, X is the same described above, and wherein at least one of R 1 to R 17 is acyl group having of the formula R—CO— or Ar—CO—, where Ar is and R is straight or branched alkyl group, or alicyclic hydrocarbon group, and R 18 to R 63 are identical or different, respectively hydrogen. halogen, hydroxyl, alkyl or alkoxy.