Method of producing silica sols with controllable broad size...

Details Method of producing silica sols with controllable broad size... Method of producing silica sols with controllable broad size...

2008-09-24

2011-11-08

Hailey, Patricia L (Department: 1732)

Compositions: coating or plastic

Materials or ingredients

Pigment, filler, or aggregate compositions, e.g., stone,...

C502S232000, C423S335000, C051S308000, C427S133000, C516S081000, C516S082000

Reexamination Certificate

active

08052788

ABSTRACT:
Colloidal silica having a controllable broad particle size distribution and a controllable minimum particle size is disclosed and claimed. Particles below a predetermined size are excluded from the product colloidal silica of the invention. A method for continuously producing the desired colloidal composition is disclosed comprising the steps of providing preformed silica particles having a surface area which controls the particle size of the colloidal silica product, adding a feed silica comprising an alkaline solution and silicate at a feed rate which is less than a nucleation rate.

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