Patent ID: 8168252

Claim:
A process for producing an electromagnetic wave shielding material, the process comprising: screen-printing in a geometric pattern a conductive paste comprising a particulate silver oxide, a tertiary fatty acid silver salt, and a solvent, onto a transparent porous layer surface of a transparent resin substrate having a transparent porous layer containing as a main component at least one member selected from the group consisting of oxide ceramics, non-oxide ceramics, and metals; and then heat-treating the printed transparent resin substrate to form a conductive region with a geometric pattern on the transparent porous layer surface, and wherein the electromagnetic wave shielding material has a total light transmission of about 72 to about 91%, a haze value of about 0.5 to about 6%, a surface resistance of not more than 5 Ω/sq., and an aperture ratio of about 80 to 95%, wherein the geometric pattern of the conductive region has a line width of about 10 to about 30 μm, and wherein the lines formed on the transparent porous layer have approximately semicircular cross sections.