Aqueous compositions and their use in the manufacture of paper and paperboard
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United States of America Patent
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Dec 30, 2008
Grant Date -
May 11, 2006
app pub date -
Mar 18, 2004
filing date -
Apr 2, 2003
priority date (Note) -
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status (Latency Note)
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Abstract
A process of preparing an aqueous composition comprising a polysilicate, wherein the composition is a substantially uniform liquid when measured at 25.degree. 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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