Ternary photoinitiator system for cationically polymerizable resins
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United States of America Patent
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Jul 20, 2004
Grant Date -
Sep 4, 2003
app pub date -
Jan 15, 2002
filing date -
Jan 15, 2002
priority date (Note) -
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Abstract
Photopolymerizable compositions comprise a cationically polymerizable resin and a photoinitiator system comprising: (i) an iodonium salt; (ii) a visible light sensitizer; and (iii) an electron donor compound having an oxidation potential less than that of 1,4-dimethoxybenzene when measured versus a saturated calomel electrode, wherein the photoinitiator system has a photoinduced potential of less than that of 3-dimethylaminobenzoic acid in a standard solution of 2.9.times.10.sup.-5 moles/g diphenyl iodonium hexafluoroantimonate and 1.5.times.10.sup.-5 moles/g camphorquinone in 2-butanone. The compositions polymerize on exposure to light in the visible spectrum and are useful in a variety of applications, including dental adhesives and dental composites.
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