Photochromic optical article

G - Physics – 02 – B

Patent

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G02B 5/23 (2006.01)

Patent

CA 2471464

Describes a photochromic plastic article, e.g., an ophthalmic photochromic article, such as a lens, in which the article includes (1) a polymeric substrate, such as a thermoset or thermoplastic substrate, (2) a photochromic polymeric coating appended to at least one surface of the substrate, the photochromic polymeric coating containing a photochromic amount of at least one organic photochromic material, e.g., spirooxazine, naphthopyran and/or flugide, and (3) a radiation-cured, acrylate-based film coherently appended to the photochromic coating, the acrylate-based film being (a) resistant to removal by aqueous solutions of inorganic caustic, e.g., potassium hydroxide, (b) compatible with organo silane-containing abrasion-resistant coating, and (c) harder than said photochromic coating. Describes also the aforedescribed photochromic article having an abrasion-resistant coating affixed to the radiation-cured acrylate-based film, e.g., an abrasion-resistant coating comprising an organo silane; and a photochromic article having an antireflective coating affixed to the abrasion-resistant coating.

L'invention concerne un article plastique photochromique, par exemple un article ophthalmique photochromique tel qu'une lentille, ledit article comprenant (1) un substrat polymérique, par exemple un substrat thermodurcissable ou thermoplastique, (2) un revêtement polymérique photochromique fixé à au moins une surface du substrat, ledit revêtement polymérique photochromique contenant une quantité photochromique d'au moins un matériau photochromique organique, par exemple spirooxazine, naphthopyrane et/ou fulgide, et (3) un film durci par rayonnement à base d'acrylate fixé de manière cohérente au revêtement photochromique, ledit film à base d'acrylate étant (a) résistant à l'élimination par des solutions aqueuses caustiques inorganiques, par exemple l'hydroxyde de potassium, (b) compatible avec le revêtement résistant à l'abrasion contenant un organosilane, et (c) plus dur que ledit revêtement photochromique. L'invention concerne également l'article photochromique mentionné ci-dessus comprenant un revêtement résistant à l'abrasion fixé au film durci par rayonnement à base d'acrylate, par exemple un revêtement résistant à l'abrasion comprenant un organosilane, et un article photochromique comprenant un revêtement antiréfléchissant fixé au revêtement résistant à l'abrasion.

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