S([O-])([O-])(=O)=O.[Zr+4:6].S([O-])([O-])(=O)=O.[P].[OH:13][P:14]([OH:17])([OH:16])=[O:15].[OH-].[Na+]>O>[P:14]([O-:17])([O-:16])([O-:15])=[O:13].[Zr+4:6].[P:14]([O-:17])([O-:16])([O-:15])=[O:13].[P:14]([O-:17])([O-:16])([O-:15])=[O:13].[P:14]([O-:17])([O-:16])([O-:15])=[O:13].[Zr+4:6].[Zr+4:6]Amorphous zirconium phosphate was prepared in all the examples. In this example the material was prepared according to the following procedure. In the first stage, a slurry containing 440 g of basic zirconium sulfate (40% ZrO2) (MEI, HCP PP142A), with a predetermined particle size distribution ranging from 50 to 60 microns, in a phosphorus-containing solution was made. The phosphorus-containing solution had the following composition: 3.3 kg of water, 402 g of 75 wt % H3PO4, 380 g of 30 wt % NaOH and 45 g of Na4SiO4. The slurry was transferred into an autoclave, sealed and heated at 160° C. for 3 hours under constant stirring. The resulting product of conversion was filtered, washed with 0.5 kg of water and re-slurried in 2 L of 1 M H2SO4. The zirconium phosphate slurry in sulfuric acid was heated to the boiling point and kept at this temperature for 1 hour. After cooling down, the zirconium phosphate was filtered, washed with 0.5 kg of water and re-slurried in 1 L of water. To the ZrP suspension a 30 wt % NaOH solution was added gradually for 30 to 40 minutes to raise the pH to 7.0. Then, the zirconium phosphate was filtered, washed with 1 kg of water and dried at 150° C. for 12 hours in air.
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