Ternary photoinitiator system for curing of epoxy resins

Details Ternary photoinitiator system for curing of epoxy resins Ternary photoinitiator system for curing of epoxy resins

C - Chemistry, Metallurgy

08

G

C08G 59/40 (2006.01) A61K 6/087 (2006.01) C08G 59/06 (2006.01) C08G 59/56 (2006.01) C08G 59/62 (2006.01) G03F 7/029 (2006.01) G03F 7/038 (2006.01)

Patent

CA 2285420

Photocurable, addition polymerizable compositions contain an epoxy resin and a photoinitiator system containing (a) an epoxy resin and (b) a photoinitiator system comprising: (i) an iodonium salt; (ii) a visible light sensitizer; and (iii) an electron donor compound, wherein the photoinitiator system has a photoinduced potential of at least about OmV relative to a standard solution of 2.9X10-5 moles/g diphenyl iodonium hexafluoroantimonate and 1.5X10-5 moles/g camphorquinone in 2- butanone. The compositions cure on exposure to light in the visible spectrum and are useful in a variety of applications, including dental adhesives and composites.

Cette invention concerne des compositions d'addition polymérisables et durcissant à la lumière qui comprennent une (a) résine epoxy ainsi qu'un système photo-initiateur (b). Ce dernier comprend à son tour un sel d'iodonium (i), un sensibilisateur à la lumière visible (ii) et un composé donneur d'électrons (iii). Ce système photo-initiateur possède un potentiel photo-induit d'au moins 0mV environ par rapport à une solution standard de 2,9X10<-5> moles/g d'hexafluoroantimonate d'iodonium de diphényle et de 1,5X10<-5> moles/g de camphorquinone dans du 2-butanone. Ces compositions se durcissent lorsqu'elles sont exposées à la lumière dans le spectre visible, et peuvent être utilisées dans diverses applications, y compris en qualité d'adhésifs et de composites dentaires.

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