ALUMINUM OXIDES AND METHODS FOR PRODUCTION THEREOF Russian patent published in 2024 - IPC C01F7/21 C09C1/40 

FIELD: chemistry.

SUBSTANCE: group of inventions relates to a method of producing surface-modified aluminium oxide and surface-modified aluminium oxide. In the method, aluminium oxyhydroxide is provided, a modifier containing a phosphon group is added to aluminium oxyhydroxide to obtain surface-modified aluminium oxide and the surface-modified aluminium oxide is dried after adding a modifier containing a phosphono-group. Surface-modified aluminium oxide has more than one of the following characteristics after dispersion at pH = 8 or higher: isoelectric point at pH less than 4; dispersibility of more than 90% when dispersing with dosage of 5, 10 or 20% by weight in basic solutions; particle size distribution having D₅₀ below 250 nm, when dispersed at dosage of 5, 10 or 20% by weight in basic solutions; and/or viscosity less than 50 cP at 500 s^-1.

EFFECT: obtaining surface-modified aluminium oxide, which is dispersible at pH = 8 and higher and has low viscosity.

11 cl, 3 dwg, 1 tbl, 3 ex