Sulfonium salt photinitiators and use thereof
View Patent ↗Sulfonium salt photoinitiator compositions, precursors useful in the preparation of such photoinitiators and the use of these photoinitiators in, e.g., UV curable adhesives, UV curable sealants, UV curable coating compositions, such as printing inks and varnishes, and UV curable encapsulants.
1. 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.
2. The photoinitiator of claim 1 having the structural formula:
where R is C 3 H 7 , C 12 H 25 or C 24 H 49 , W is S, SO, SO 2 or CO.
3. The photoinitiator of claim 2 where W is S and R is C 3 H 7 or C 12 H 25 .
4. The photoinitiator of claim 2 where W is SO and R is C 3 H 7 or C 12 H 25 .
5. The photoinitiator of claim 1 having the structural formula:
where R 1 and R 2 are independently CH 3 , C 2 H 5 , C 3 H 7 , C 12 H 25 , C 24 H 49 , OCH 3 , OC 2 H 5 , OC 3 H 7 , OC 12 H 25 or OC 24 H 49 .
6. The photoinitiator of claim 5 where R 1 is C 3 H 7 or C 12 H 25 and R 2 is OC 3 H 7 or OC 12 H 25 .
7. The photoinitiator of claim 6 where R 1 is C 12 H 25 and R 2 is OC 3 H 7 .
8. A photocurable composition comprising the photoinitiator of any of claims 1 , 2 , 5 or 6 .
9. The composition of claim 8 which is a photocurable adhesive, coating or sealant composition.
10. The composition of claim 9 which is a photocurable hot melt adhesive.
11. The compound 2-decyl-1-tetradecyl bromide.