Patent ID: 7291288
Filing Date: 2007-11-06
Classification: B32B,C04B,C09K,Y10T

Abstract:
1. An artificial stone, which comprises a transparent aggregate, at least one of a light accumulating material or luminescent material by ultraviolet rays, an inorganic filler and a resin, wherein the time required for brightness of the artificial stone after irradiation until saturation at 200Lx by a D65 common light source to reach 3 mcd/m 2 is longer than that for the light accumulation material or luminescent material by ultraviolet rays per se, and wherein the particle diameter of the transparent aggregate is 0.3 mm or more and 1/1.5 or less of the thickness of the artificial stone after casting and hardening; the average particle diameter of the light accumulating material and/or the luminescent material by ultraviolet ray is 80 μm or more and 300 μm or less; the particle diameter of the inorganic filler is less than 0.1 mm; the volume of the transparent aggregate is 20% or more and 80% or less; the amount of the resin is 25-70 volume %; and the artificial stone further comprises a nontransparent aggregate having a particle diameter which is 1/1.5 or less of the thickness of the artificial stone after casting and hardening, and wherein the total volume of the transparent aggregate and the nontransparent aggregate together in the artificial stone is 20% or more and 80% or less.