Ternary photoinitiator system for cationically polymerizable...

C - Chemistry – Metallurgy – 08 – L

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C08L 63/00 (2006.01) A61C 13/23 (2006.01) A61K 6/00 (2006.01) A61K 6/087 (2006.01) C08F 2/50 (2006.01) C08K 5/01 (2006.01) C08K 5/3417 (2006.01)

Patent

CA 2471776

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 2.9x10-5 moles/g diphenyl iodonium hexafluoroantimonate and 1.5x10-5 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.

L'invention concerne des compostions photopolymérisables contenant une résine à polymérisation cationique et un système photo-initiateur qui comprend: (i) un sel de iodonium; (ii) un sensibilisateur à la lumière visible; et (iii) un composé électrodonneur présentant un potentiel d'oxydation inférieur à celui de 1,4-diméthoxybenzène lorsqu'il est mesuré par rapport à une électrode au calomel saturé. Le système photo-initiateur présente un potentiel photo-induit inférieur à celui de l'acide 3-diméthylaminobenzoïque dans une solution classique de 2,9x10?-5¿ moles/g de diphényl iodonium hexafluoroantimonate et de 1,5x10?-5¿ moles/g de camphorquinone dans 2-butanone. Les compositions décrites dans cette invention se polymérisent à l'exposition à la lumière dans le spectre visible et elles conviennent à une multitude d'applications, parmi lesquelles les résines de scellement et les composites dentaires.

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