JGC has filed a patent for a method of producing titanium oxide fine particles with high transparency and low photocatalytic activity while maintaining a high refractive index. The method involves several steps, including neutralizing an aqueous metal mineral acid salt solution, adding hydrogen peroxide and a tin compound, and hydrothermally treating the solution. The resulting dispersion of iron-containing rutile titanium oxide fine particles has potential applications in various industries. GlobalData’s report on JGC gives a 360-degree view of the company including its patenting strategy. Buy the report here.
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According to GlobalData’s company profile on JGC, Ammonia synthesis catalysts was a key innovation area identified from patents. JGC's grant share as of September 2023 was 27%. Grant share is based on the ratio of number of grants to total number of patents.
Method for producing dispersion of iron-containing rutile titanium oxide fine particles
A recently filed patent (Publication Number: US20230303403A1) describes a method for producing a dispersion of iron-containing rutile titanium oxide fine particles. The method involves several steps to achieve the desired outcome.
In the first step, an aqueous metal mineral acid salt solution containing titanium (Ti) and iron (Fe) is neutralized to form iron-containing hydrous titanic acid. The masses of the metals in the solution are such that the ratio of Fe2O3 to the total mass of TiO2 and Fe2O3 is between 0.001 and 0.010.
Next, an aqueous hydrogen peroxide solution is added to the iron-containing hydrous titanic acid obtained in the previous step. This forms an aqueous solution of iron-containing peroxotitanic acid with an average particle size ranging from 15 to 50 nm.
In the third step, a tin compound is added to the aqueous solution of iron-containing peroxotitanic acid. The amount of tin (Sn) and titanium (Ti) in the solution, in terms of oxide, must satisfy the ratio of TiO2 to SnO2 between 6 and 16.
The fourth step involves adding a sol of silica-based fine particles to the solution obtained in the previous step. The silica-based fine particles contain silicon (Si) and at least one metal element (M) selected from a group including aluminum (Al), zirconium (Zr), antimony (Sb), zinc (Zn), nickel (Ni), barium (Ba), magnesium (Mg), and vanadium (V). The masses of Si and the metal element(s) in terms of oxide must satisfy a specific ratio, ranging from 99.9/0.1 to 80/20. Additionally, the masses of the metal elements in the solution and the masses of silicon and the metal element(s) in the sol must satisfy a ratio of SiO2 to the total mass of TiO2, SnO2, Fe2O3, SiO2, and MOx/2 (where x is the valence of M) between 0.08 and 0.22.
Finally, the solution obtained in the previous step is subjected to hydrothermal treatment in the fifth step. This treatment produces a dispersion of iron-containing rutile titanium oxide fine particles.
In a specific embodiment of the method described in claim 2, the silica-based fine particles used in the fourth step have a specific surface area ranging from 100 to 600 m2/g.
This patent application presents a detailed method for producing a dispersion of iron-containing rutile titanium oxide fine particles. The method involves precise control of the composition and ratios of various components to achieve the desired outcome. The resulting dispersion can have potential applications in various fields, including materials science and catalysis.
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