Patent ID: 7759414

Claim:
A method of making a nanoparticulate solar control composition comprising an ethylene acid copolymer, a second ethylene acid copolymer, and deagglomerated, dispersed nanoparticles of an inorganic infrared absorbing material, said method comprising the steps of: combining a polymeric matrix material and agglomerated, undispersed nanoparticles of an inorganic infrared absorbing material to provide a nanoparticle concentrate consisting of the polymeric matrix material and deagglomerated, dispersed nanoparticles of the inorganic infrared absorbing material; wherein the polymeric matrix material consists of the ethylene acid copolymer; wherein the deagglomerated, dispersed inorganic infrared absorbing nanoparticles comprise one or more substances selected from the group consisting of a metal, a metal containing compound, and a metal containing composite; wherein the metal containing compound is selected from the group consisting of a metal boride, a metal oxide, a metal nitride, a metal oxynitride, a metal phosphate, and a metal sulfide; wherein the metal containing composite comprises the metal or the metal containing compound and further comprises at least one doping substance; and wherein the deagglomerated, dispersed inorganic infrared absorbing nanoparticles are present in the nanoparticle concentrate at a level of about 30 wt % to about 80 wt %, based on the total weight of the nanoparticle concentrate; providing the second ethylene acid copolymer, which may be the same as or different from the polymeric matrix material; and combining the nanoparticulate solar control concentrate and the second ethylene acid copolymer to form the nanoparticulate solar control composition; wherein the ethylene acid copolymer comprises one or more acid comonomers selected from the group consisting of acrylic acid, methacrylic acid, itaconic acid, maleic acid, maleic anhydride, fumaric acid, and monomethyl maleic acid.