Patent ID: 9657209
Date: 2017-05-23
CPC Classifications: C01B,C01F,C08G,C08K,C09C,C09K

Claim:
1. A process of manufacturing self-dispersing nanoparticles of a metal oxide, comprising: a step of addition of a water-soluble polymer to a dispersion of nanoparticles; a step of thermal quenching of the resulting dispersion in liquid nitrogen, wherein the step of thermal quenching comprises adding the resulting dispersion dropwise to the liquid nitrogen to form beads; and a step of lyophilization of the quenched dispersion obtained, and comprising, optionally, a step of manufacture of the dispersion of said nanoparticles, before the step of addition of the water-soluble polymer, wherein the dispersion of nanoparticles is an aqueous dispersion of nanoparticles selected from the group consisting of nanoparticles of alumina (Al the water-soluble polymer is selected from the group consisting of polyvinyl alcohols, polyethylene glycols, polyvinylpyrrolidones, polyoxazolines, starches, and mixtures of two or more thereof.