Optical materials having good ultraviolet absorbability and method for producing them
AssigneeHoya Corporation
InventorMasahisa Kosaka
Life of this patent
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Abstract
An optical material, particularly a plastic lens for spectacles, which absorbs almost all UV rays of up to around 400 nm or so and is not too yellow in color, is obtained by adding 2-(2-hydroxy-4-octyloxyphenyl)-benzotriazole to a diethylene glycol bisallylcarbonate monomer, a (thio)urethane monomer or an episulfide monomer, mixing them, and polymerizing the monomer.
Claims10
An optical lens comprising 2-(2-hydroxy-4-octyloxyphenyl)-benzotriazole dispersed in a polymer formed by polymerizing a thiourethane monomer and a hard film on a surface of the lens produced by curing a coating liquid comprising an organosilicon compound.
An optical lens comprising 2-(2-hydroxy-4-octyloxyphenyl)-benzotriazole dispersed in a polymer formed by polymerizing a thiourethane monomer with a monomer having an episulfide group and a hard film on a surface of the lens produced by curing a coating liquid comprising an organosilicon compound.
Dependencies are inferred from the claim text.