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US 2003/0111417 A1Published application
System and method for controling uniformity of colloidal silica particle size
AssigneeChemical Products Corporation
InventorAndrew Joseph Paszkowski
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Abstract
A system and method are disclosed for producing uniform size silica particles by the steps of providing preformed colloidal silica particles having a surface area, adding an alkali metal silicate and a cation exchange resin to produce a quantity of feed silica at a feed rate which is less than a nucleation rate, and increasing the feed rate as the feed silica is added wherein the feed rate is less than the nucleation rate.
Claims14
A method for producing silica particles comprising the steps of:
- providing preformed colloidal silica particles having a surface area;
- adding an alkali metal silicate and a cation exchange resin to produce a quantity of feed silica at a feed rate which is less than a nucleation rate, and
- increasing said feed rate as said feed silica is added wherein said feed rate is less than said nucleation rate.
A silica sol comprising of,
- silica particles having a particle size distribution with a coefficient of dispersion between 0.16 and 0.5 and a sodium content less than 10 ppm.
Dependencies are inferred from the claim text.