Patent ID: 8038786

Claim:
A compound for producing a heat-ray cutoff film, comprising: a dispersion sol including conductive nanoparticles uniformly dispersed in a solvent formed essentially of an amphiphilic material and a surface charge mediating agent, the surface charge mediating agent providing the conductive nanoparticles with a same type of surface charge and an electrical double layer formed of counter ions surrounding the conductive nanoparticles; and a resin binder selected from an alkyd, a polyvinylalcohol, a polybutylalcohol, an acrylic, an acrylstyrene, a super-acid vinyl, a polyvinylbutyral, a polyvinylacetal, a polycarbonate, a polychloride vinyl, a urethane, a melamine, a polyester, an epoxy, an epoxy acrylate, a polyether acrylate, a polyester acrylate, or a urethane-metamorphosed acrylate, the resin binder being in a range of about 5 to 40 wt % relative to the compound, wherein the solvent with the conductive nanoparticles dispersed therein has amphiphilic properties, the surface charge mediating agent is selected from acetic acid, glacial acetic acid, hydrochloric acid, nitric acid, phosphoric acid, sulfuric acid, or polyacrylic acid, the solvent includes ethylene glycol monomethyl ether, ethylene glycol monoethyl ether, ethylene glycol monopropyl ether, or ethylene glycol monobutyl ether, and the conductive nanoparticles are present in an amount of at least 20 wt % relative to the dispersion sol.