Optical materials having good ultraviolet absorbability and method for producing them
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United States of America Patent
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Aug 27, 2002
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N/A
app pub date -
Sep 20, 2000
filing date -
Sep 20, 1999
priority date (Note) -
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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.
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