Nano-sized dispersible powders and method of making
AssigneeNyacol Nano Technologies, Inc.
InventorsThomas O'Connor, Robert J. Nehring JR., R. Andrew Russell
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Abstract
A hydrophilic powder such as silica, adapted for dispersion in organic solvents and polymers, is provided with a coating over the outer surface of the powder particles to modify the surface characteristic from polar to non-polar or organophilic, whereby the thus coated powder is readily dispersible without agglomeration or enlargement of the powder particles. Preferred are nano-sized powders.
Claims22
A particulate powder adapted for dispersion in organophilic solvents and in organophilic polymers, the particulate powder being prepared from a sol precursor for the powder, the outer surface of the powder particles having a first coating containing a reagent providing a surface reactive to a second coating covering the first coating;
- the second coating containing an organic acid or an organic acid derivative, the coated powder being characterized as being fully dispersible in the organophilic polymers or in organic solvents substantially free from any agglomeration of the ultimate particles of the powder particles and without any change of the particle size distribution of the sol precursor for the powder before drying of the treated precursor to prepare the particulate powder.
Dependencies are inferred from the claim text.