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Application of easy clean coating materials to ophthalmic lenses Disclosure Number: IPCOM000228121D
Publication Date: 2013-Jun-06
Document File: 1 page(s) / 52K

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Ophthalmic lenses though which light is transmitted to the human eye may be made of thermoplastic material. These lenses may have an antireflective coating on them. This coating may be prepared from dielectric materials including metal oxides. Protective coatings may be applied to these coated ophthalmic lenses by covalently bonding materials to the antireflective coating.

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Application of easy clean coating materials to ophthalmic lenses 

     Ophthalmic lenses are any lens (tinted, coated, or otherwise) through which light is transmitted  into a human eye during ordinary use.  Examples of ophthalmic lenses include eye glass lenses (including  spectacle and monocle lenses), binocular lenses, and telescope lenses (e.g. eyepieces).  These lenses  may be made from thermoplastic material.  Examples of thermoplastic material include polyacrylates,  polymethacrylates (e.g. poly(methyl methacrylate)), polystyrene, styrenic copolymers (e.g. acrylonitrile  butadiene‐styrene copolymers and acrylonitrile‐styrene copolymers), cellulose esters (e.g. cellulose  acetate and cellulose acetate‐butyrate copolymers), polyvinyl chloride, polyolefins (e.g. polyethylene  and polypropylene), polycarbonates, polyimides, polyphenylene oxide, polyesters (e.g. polyethylene  terephthalate and polyethylene napthalate), polyurethanes,  polythiourethanes, and combinations  thereof.   

     Ophthalmic lenses often have antireflective, or AR, coatings on one major surface of the lens.   This layer refers to at least one layer of a dielectric material having an index of refraction that is lower  than the index of refraction of the material supporting the coating and is capable of at least partially  transmitting one or more wavelengths of visible electromagnetic radiation.  AR coating layers can be  prepared from dielectric materials such as, for, example, metal oxides, metal sulfides (e.g. zinc sulfide),  metal halides (e.g. magnesium fluoride), metal nitri...