Process of integrating a photochromic substance into an ophthalmic lens and a photochromic lens of organic material
AssigneeEssilor International Cie Generale d'Optique
InventorLyliane Le Naour-Sene
Life of this patent
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Abstract
A process of integrating a photochromic substance, especially a spiropyran or a metal dithizonate, into a transparent substrate of polymerized organic material such as poly [ethylene glycol di-allyl di-carbonate] by thermal transfer, comprising applying the photochromic substance alone or with a solvent and/or thickening agent to the surface of a transparent organic substrate such as a lens disc, and heating until the photochromic substance is sublimed and then diffused and anchored in the organic material of the lens, preferably just beneath the surface to which it is applied. Preferably, the photochromic substance is initially carried on a temporarily support for application.
Claims17
A process of integrating a photochromic substance into a transparent substrate of polymerized organic material comprising the steps of placing a photochromic material containing a photochromic substance into contact with the substrate, and heating the photochromic material thus in contact with the substrate thereby thermally transferring the photochromic substance into the substrate.
A process of integrating a photochromic substance into a transparent substrate of polymerized organic material comprising the steps of applying a photochromic substance on the transparent substrate and heating the photochromic substance thus in contact with the substrate until the photochromic substance sublimes, and allowing the sublimed photochromic substance to be absorbed into organic material of the substrate.
A process of making a photochromic ophthalmic lens comprising applying a photochromic material containing at least in part a photochromic substance to a transparent organic ophthalmic lens or lens disc, applying heat to the photochromic material thus in contact with the lens or lens disc until the photochromic substance is thermally transferred from the surface of the ophthalmic lens or lens disc into the organic material constituting the lens or lens disc by sublimation and absorption of the photochromic substance.
A process of impregnating a photochromic substance selected from the group consisting of metal dithizonates and spiropyrans into a substrate of transparent polymerized organic material selected from the group consisting of poly[ethylene glycol di-allyl di-carbonate], polycarbonate, methyl polymethacrylate and transparent polyurethane, comprising the steps of applying a photochromic material containing a photochromic substance to the transparent substrate, then heating the photochromic substance thus in contact with the transparent substrate whereby the photochromic substance is absorbed into the organic material of the substrate.
Dependencies are inferred from the claim text.