Optical materials having good ultraviolet absorbability and method for producing them
AssigneeHoya Corporation
InventorMasahisa Kosaka
Life of this patent
Estimating the term…
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.
Claims15
A method for producing an optical lens comprising,
- adding 2-(2-hydroxy-4-octyloxyphenyl)-benzotriazole to a diethylene glycol bisallylcarbonate monomer to form a mixture, and
- polymerizing the monomer in the mixture to form the optical lens,
- wherein the optical lens has a yellowness index (YI) between about 0.7 and 1.6 and a 380 mn UV transmittance of at most 30% measured when a thickness of the optical lens is about 2.2 mm.
An optical lens comprising 2-(2-hydroxy-4-octyloxyphenyl)-benzotriazole and a polymer formed by polymerizing a diethylene glycol bisallylcarbonate monomer.
A method for producing an optical lens comprising,
- adding 2-(2-hydroxy-4-octyloxyphenyl)-benzotriazole to an episulfide monomer to form a mixture, and
- polymerizing the monomer in the mixture to form the optical lens,
- wherein the optical lens has a yellowness index (YI) between about 0.7 and 1.8 and a 400 nm UV transmittance of at most 30% measured when a thickness of the optical lens is about 1.8 mm.
An optical lens comprising 2-(2-hydroxy-4-octyloxyphenyl)-benzotriazole and a polymer formed by polymerizing an episulfide monomer,
- wherein the optical lens has a yellowness index (YI) between about 0.7 and 1.8 and a 400 nm UV transmittance of at most 30% measured when a thickness of the optical lens is about 1.8 mm.
A method for producing an optical lens comprising,
- adding 2-(2-hydroxy-4-octyloxyphenyl)-benzotriazole to an thiourethane monomer to form a mixture, and
- polymerizing the monomer in the mixture to form the optical lens,
- wherein the optical lens has a yellowness index (YI) between about 0.7 and 1.5 and a 400 nm UV transmittance of at most 35% measured when a thickness of the optical lens is about 1.6 mm.
An optical lens comprising 2-(2-hydroxy-4-octyloxyphenyl)-benzotriazole and a polymer formed by polymerizing a thiourethane monomer.
Dependencies are inferred from the claim text.