Ternary photoinitiator system for cationically polymerizable resins

US6765036B2 · kind B2 · utility

Assignee

• 3M INNOVATIVE PROPERTIES COMPANY · US

Inventors

• Karsten Dede · Landsberg, DE
• Thomas Klettke · Dießen, DE
• Thomas Luchterhandt · Pleidelsheim, DE
• Joel D. Oxman · Minneapolis, US

Key dates

• Filing date: Jan 15, 2002
• Grant date: Jul 20, 2004
• Expiry date: Apr 29, 2022

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10S522/908
• WIPO field: Pharmaceuticals
• WIPO sector: Chemistry

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 2.9×10−5 moles/g diphenyl iodonium hexafluoroantimonate and 1.5×10−5 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.