Patent ID: 8114804
Filing Date: 2012-02-14
Classification: B82Y,C01G,C01P,C02F,C09C

Abstract:
1. A process for making a self-deagglomerating suspension of finely divided titanium (IV) oxide nanoparticles, comprising the following steps: 1) mixing with a vigor equivalent to a shear rate of greater than 100s-1 (a) and (b) wherein (a) 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) 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 agglomerated titanium (IV) oxide particles that deagglomerate over time into an optically transparent suspension of titanium (IV) oxide nanoparticles.