Patent ID: 7230122

Claim:
A sulfonium salt photoinitiator having the structural formula: where X 1 is Cl, Br, I, or F, X 2 is Cl, I, F, H, alkyl or alkoxy, Y 1 , Y 2 , Y 3 , Y 4 and Y 5 are independently H, R, or X 1 or 2 , Z is SAr + ·M − , wherein Ar is phenyl, C 1-24 alkyl phenyl, C 1-24 alkoxyphenyl, acyl, thiophenyl, phenylthiophenyl, phenylsulfoxyphenyl, phenylsulfonylphenyl, C 1-24 alkyithiophenyl, C 1-24 dialkyl substituted phenyithiophenyl, 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 − , and R is C 1-24 alkoxy, C 1-24 alkyl, aryl, Cl, Br, I, or F.