Patent ID: 7560219

Claim:
A sulfonium salt photoinitiator having the structural formula: where R 1 , R 2 , R 3 and R 4 are independently a C 1-24 alkoxy, a C 1-24 alkyl, an aryl, H, Cl, Br, I or F, wherein at least one of R 1 , R 2 , R 3 or R 4 is a halogen, Y 1 , Y 2 , Y 3 , Y 4 , Y 5 and Y 6 are independently Z or R 1-4 , wherein at least one of Y 1 , Y 2 , Y 3 , Y 4 , Y 5 or Y 6 is Z, Z is SAr 2 + ·M − , wherein Ar is phenyl, C 1-24 alkyl phenyl, C 1-24 alkoxyphenyl, acyl, thiophenyl, phenylthiophenyl, C 1-24 alkylthiophenyl, C 1-24 dialkyl substituted phenylthiophenyl, or C 1-24 dialkoxy substituted phenylthiophenyl, and M − is SbF 6 − , PF 6 − , AsF 6 − , BF 4 − , B(C 6 F 5 ) 4 − or Ga(C 6 F 5 ) 4 − .