Temperature stable and sunlight protected photochromic articles

Details Temperature stable and sunlight protected photochromic articles Temperature stable and sunlight protected photochromic articles

C - Chemistry, Metallurgy

08

F

C08F 20/30 (2006.01) C08F 2/24 (2006.01) C08F 22/10 (2006.01) C08J 3/20 (2006.01) C08K 5/1545 (2006.01) C08K 5/3412 (2006.01) C08K 5/3437 (2006.01) G02B 1/04 (2006.01) G02C 7/02 (2006.01) G02C 7/10 (2006.01)

Patent

CA 2203810

The invention relates to photochromic transparent organic materials particularly useful for the production of photochromic organic ophthalmic lenses. The material includes an optical-quality polymer matrix and at least one coloring agent giving photochromic properties to the matrix. The coloring agent is chosen from the group of the spirooxazins, the spiropyrans, and the chromenes. The polymer of the matrix is chosen from the group of homopolymers of ethyoxylated bisphenol A dimethacrylate with formula (I) in which R is H or CH3, and m and n independently represent 1 or 2, and of the copolymers of this dimethacrylate containing at most 30 wt.% of an aromatic monomer with vinyl, acrylic or methacrylic functionality.

L'invention se rapporte à des matériaux organiques transparents photochromiques, utilisés notamment dans la production de lentilles ophtalmiques organiques photochromiques. Le matériau comprend une matrice polymère de qualité optique et au moins un agent colorant conférant à la matrice des propriétés photochromiques. L'agent colorant est choisi dans le groupe des spiro-oxazines, des spiro-pyranes et des chromènes. Le polymère de la matrice est choisi dans le groupe des homopolymères de diméthacrylate bisphénol A éthyoxilé ayant la formule (I), dans laquelle R représente H ou CH¿3?, et m et n représentent, indépendamment, 1 ou 2, et dans le groupe des copolymères de ce diméthacrylate contenant au moins 30 % en poids d'un monomère aromatique ayant une fonctionalité vinylique, acrylique ou méthacrylique.

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