Patent ID: 8557377

Claim:
A photochromic optical element consisting of: an optical substrate, a photochromic coat layer, and a hard coat layer, that are laminated in this order, wherein (I) the photochromic coat layer is formed from a cured product which is obtained by coating the optical substrate with a photochromic coating agent comprising a polymerizable monomer and a photochromic compound, followed by curing the photochromic coating agent, and the cured product comprising as the photochromic compound, an alkylamino group-containing photochromic compound and/or a dialkylamino group-containing photochromic compound in a total amount of 0.1 to 10.0% by mass of the photochromic coat layer, wherein (II) the hard coat layer is formed from a cured product which is obtained by coating the photochromic coat layer with a hard coat agent comprising metal oxide particles having an average diameter of 1-300 nm and an organosilicone compound, followed by curing the hard coat agent, the hard coat agent at least containing as the organosilicone compound at least one component (A) selected from the group consisting of a tetraalkoxy silane, a methyl trialkoxy silane, and partial hydrolysates thereof, and a component (B) consisting of an epoxy group containing silicone compound and/or partial hydrolysates thereof, the hard coat agent containing the metal oxide particles, the component (A) and the component (B) in a total amount of 45 to 100% by mass, the hard coat agent containing the metal oxide particles in an amount of 20 to 70% by mass, the component (A) in an amount of 10 to 50% by mass, and the component (B) in an amount of 15 to 60% by mass, based on the total mass of the metal oxide particles and the organosilicone compound with the proviso that, when the organosilicone compound is a partial hydrolysate of a partially hydrolyzable organosilicone compound, the mass of the organosilicone compound in the above total mass is the mass of the partially hydrolyzable organosilicone compound.