Silica sols containing large particle size silica
AssigneeNalco Chemical Company
InventorWilliam L. Albrecht
Life of this patent
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Abstract
There is disclosed a concentrated stable alkaline silica sol having a pH of from 7.0 to 10.0 consisting essentially of from 35% to 70% by weight of large, spherical, uniform, non-aggregated silica particles having a weight-average particle diameter of about 45 to about 100 millimicrons and water as the hydrophilic liquid carrier of said particles, said sol at a 50% silica concentration having a viscosity of less than 10 cps at 25.degree.C. and a specific conductance of less than 5000 micromhos/cm.
Claims4
A concentrated stable alkaline silica sol having a pH ranging from 7.0 to 10.0 consisting essentially of from 35% to 70% by weight of large, spherical, uniform, non-aggregated silica particles expressed as SiO.sub.2 having a weight-average particle diameter of about 45 to about 100 millimicrons and the water as the hydrophilic liquid carrier of said particles, said sol at a 50% silica concentration having a viscosity of less than 10 cps at 25.degree. C. and a specific conductance of less than 5,000 micromhos/cm.
A concentrated stable alkaline silica sol having a pH ranging from 7.0 to 10.0 consisting essentially of from 35-55% by weight of uniform, non-aggregated silica particles, expressed as SiO.sub.2, having a weight-average particle diameter from about 45 to about 70 millimicrons and water as a hydrophilic liquid carrier of said silica particles, said sol at a 50% silica concentration having a viscosity of less than 10 cps at 25.degree. C. and a specific conductance of less than 5000 micromhos/cm.
Dependencies are inferred from the claim text.