Patent ID: 7998453

Claim:
A process for making a nanoparticle suspension of titanium (IV) oxide particles, comprising the following steps: 1) mixing with a vigor equivalent to a shear rate of greater than 100 s −1 (a) and (b) wherein (a) is a volume of a first component comprising an alcohol in an amount of more than 50 wt. % based on the weight of the first component, a titanium alkoxide in an amount ranging from 0.001 wt. % to 6 wt. % based on the weight of the first component, and a titanium alkoxide activator in an amount ranging from 0.2 wt. % to 1.6 wt. % based on the weight of the first component, the titanium alkoxide activator being selected from the group consisting of water and a first aqueous base selected from the group consisting of ammonium hydroxide, sodium hydroxide, sodium pyrophosphate, potassium pyrophosphate, sodium citrate, diammonium hydrogen phosphate and mixtures thereof, and (b) is a volume of a second component selected from the group consisting of water and a second aqueous base selected from the group consisting of ammonium hydroxide, sodium hydroxide, sodium pyrophosphate, potassium pyrophosphate, sodium citrate, diammonium hydrogen phosphate and mixtures thereof, and at least one of the first component or the second component having a base therein, 2) rapidly forming a mixture comprising a suspension of titanium (IV) oxide nanoparticles having a volume-weighted median particle size measured via dynamic light scattering below approximately 100 nm, the mixture having a water to titanium molar ratio ranging from about 40 to about 1 to about 5000 to about 1.