High index curable photochromic composition and its process

Details High index curable photochromic composition and its process High index curable photochromic composition and its process

C - Chemistry, Metallurgy

08

F

C08F 222/10 (2006.01) G02B 1/04 (2006.01)

Patent

CA 2463150

There is provided a high refractive index, curable, synthetic resin composition comprising a core resin composition composed of a mixture of ethylenically unsatured compounds, and an initiation system containing both photo and thermal initiators, particularly a photochromic resin composition which further includes at least one photochromic dye. There is also provided a curing process, which includes a combination of multi-step radiation curing a thermal annealing. Articles produced of the cured composition exhibit superior physical and, in appropriate cases, photochromic properties and can be easily mass produced on a commercial scale due to short processing time and use of readily available chemicals.

L'invention concerne une composition de résine synthétique, durcissable, à indice de réfraction élevé, comprenant une composition de résine de noyau composée d'un mélange de composés non saturés en éthylène, et un système d'amorçage contenant à la fois des photoamorceurs et des thermoamorceurs, plus particulièrement une composition de résine photochromique qui contient également au moins un colorant photochromique. L'invention se rapporte également à un procédé de durcissement combinant à la fois un durcissement par rayonnements en plusieurs étapes et un recuit thermique. Des articles fabriqués à partir de la composition durcie présentent des propriétés physiques supérieures et, dans certains cas appropriés, peuvent être facilement produits en masse, sur une échelle commerciale, en raison du faible temps de traitement et de l'utilisation de produits chimiques facilement disponibles.

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