Abstract: Nanopigments were prepared from organic IR dye and Na-bentonite with CEC of 95 mmole Na per 100 g of bentonite, at room temperature, by dissolving the Na-bentonite in water and mixing for 2 hours, and mixing in the dye, dissolved in ethanol, for 18 hours. The precipitate is filtered, washed three times with water/ethanol mixture, dried at 105° C. for 10 hours, and milled in a kitchen miller for 2 mins. 0.3 parts of the nanopigments were mixed to 100 parts of pulverized SPG resin and processed in an extruder with a die temperature of 190° C. to form transparent, faintly green or grey coloured extrudates which were used to press film of 0.4 mm thickness at 160° C. The films were used to prepare IR-active laminated glass. Near infrared absorption spectra of the glass structures were obtained in a Perkin-Elmer Spectrophotometer.

Abstract: There is provided a glazing laminate comprising a polyvinyl butyral core layer having polyvinyl butyral/IR dye layers on each side. The dye containing layers are solvent cast from methanol onto the core layer. The dyes in each layer are different comprising BN 18 type PVB containing either 2 mg Epoline III-125 or 2 mg of Epolite III-57 dyes per grams of resin and dissolved in 10 ml of analytical grade of methanol for casting. The polymer is sandwiched between two glass layers under pressure and heat treatment at 135-140° C. An overall concentration of the dyes of ˜0.1 g/m2 results in an energy absorption over 65%. The heating effect of absorption is reduced by conduction through the polymer to the laminate edges, internal reflection, spherical reradiation and the relative insulative effect of the glass layers.