Paper making and fiber liberation – Processes and products – Non-fiber additive
Reexamination Certificate
2004-03-18
2008-12-30
Griffin, Steven P (Department: 1791)
Paper making and fiber liberation
Processes and products
Non-fiber additive
C162S158000, C162S164100, C162S181800, C162S185000, C106S287340, C106S484000, C423S330100, C516S079000, C516S110000
Reexamination Certificate
active
07470346
ABSTRACT:
A process of preparing an aqueous composition comprising a polysilicate, wherein the composition is a substantially uniform liquid when measured at 25° C., comprising the steps of, i) providing an aqueous liquid having a source of silicate, ii) adjusting the pH of the liquid to between about 2 and about 10.5, thereby causing polymerisation of the silicate, iii) allowing sufficient time for the polymerisation to proceed to substantial completion and thereby forming a product comprising gelled material, iv) subjecting the gelled material to sufficient shear to form a substantially uniform liquid. The novel aqueous composition made by this process is useful in the manufacture of paper and paperboard either as a mineral filler or as a retention/drainage aid.
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Donnelly Simon
Ford Philip
Rys Laurence
Ciba Specialty Chemicals Water Treatments Ltd.
Cordray Dennis
Griffin Steven P
Loggins Shiela A.
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