Tungsten Oxide Compound

Tungsten oxides and tungstates are known as infrared shielding material.US 2007/0187653 discloses an infrared shielding nanoparticle dispersion comprising tungsten trioxide having reduced oxygen. In US2007/0187653, the starting materials are heat treated at a temperature 100-850℃ in an atmosphere of a reducing gas, and subsequently heat treated at a temperature of 550-1200℃ in an atmosphere of an inert gas.

Although the process for making a tungsten oxide material known from the prior art is satisfactory for some applications, there is still a need in the industry for a new process which is more simple and have a higher flexibility. Further, there is also a need for a new tungsten oxide compound having different physical properties from known tungsten oxide compounds.

It is an object of the present method to provide a new process for preparing a tungsten oxide compound which overcomes the above and/or other problems. It is a further object of the present invention to provide a tungsten oxide compound having different physical properties from known tungsten oxide compounds.

Accordingly, the present invention provides a process for making a tungsten oxide compound comprising the steps of:

a) providing an aqueous suspension comprising a tungstate and a phosphate compound;

b) heating the solution in an autoclave at a temperature of at least 200^ to obtain a reaction mixture and

c) cooling the reaction mixture to ambient temperature.

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