Method for coloring a transparent article made of polycarbonate and resulting article
AssigneeEssilor International (Compagnie Generale d'Optique)
InventorGilles Baillet
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Abstract
The invention concerns a method which consists in irradiating at least one face of the article with UV radiation, causing the article to be photodegraded over a thickness of at least 1 μm, and in contacting the irradiated face of the article with a colouring agent so as to diffuse the colouring agent in the entire thickness of the photodegraded surface layer of the article. The invention is useful for optical and ophthalmologic articles.
Claims17
An optical or ophthalmic article made from polycarbonate material, the polycarbonate material further defined as a polycarbonate material not containing polyester groups, the article comprising at least one photo degraded surface layer into which a coloring agent has been diffused, the at least one photo degraded surface area being on at least one principal face of the article and comprising a thickness of at least 1 μm.
Dependencies are inferred from the claim text.