Optical recording materials, method for preparing the same and optical cards having the same

摘要

An optical recording material comprising: a thin film or membrane of a hydrophobic binding agent; and metallic particles having a diameter of 0.003 mu m to 3 mu m dispersed in said film or membrane wherein the density of said metallic particles is higher near at least one surface of said film or membrane as compared with another portion of said film or membrane, each metallic particle having a nucleus and an outer coating, said outer coating consisting of at least one metal having a melting point of 250 DEG C. to 1800 DEG C. and a thermal conductivity at 0 DEG C. of 5 Wxm-1xK-1 to 450 Wxm-1xK-1 wherein the reflectivity of the surface of said film or membrane where the density of said metallic particle is higher is 10 to 90%., a method for preparing the optical recording material and an optical card containing the optical recording material.