Layered product and method of producing the same
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United States of America Patent
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Oct 28, 2008
Grant Date -
Jun 7, 2007
app pub date -
Feb 2, 2005
filing date -
Feb 3, 2004
priority date (Note) -
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Abstract
A layered product comprising an optical substrate having, on at least one surface thereof, a photochromic surface layer constituted by a resin in which a photochromic compound is dispersed, and an ultraviolet ray-absorbing film of a thickness of 0.1 to 100 .mu.m formed on the photochromic surface layer of the optical substrate, the ultraviolet ray-absorbing film having a transmission factor of not smaller than 50% for a ray of light of 360 nm and a transmission factor of not larger than 10% for a ray of light of 320 nm. The layered product features a very high photochromic light resistance without causing a drop in the color density while effectively preventing the oxidation and deterioration of the photochromic compound.
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