Patent · US Active

Storage-stable silicate solutions

US9193598B2 · kind B2 · utility

0Cited by

3References

10Claims

0Family size

Assignee

Cognis IP Management GmbH · DE

Inventors

Ralf Bohlander · Goldkronach, DE
Silke Muckenfuβ · Langenfeld, DE
Rüdiger Ziervogel · Monheim, DE

Key dates

Filing date	Feb 7, 2011
Grant date	Nov 24, 2015
Priority date	—
Expiry date	Apr 29, 2033

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC01B33/325
WIPO fieldMaterials, metallurgy
WIPO sectorChemistry

Abstract

Disclosed are aqueous solutions of silicates (waterglasses), comprising (a) 20 to 40% by weight of SiO2, (b) 10 to 30% by weight of M2O, where M is a cation selected from the group consisting of Li+, Na+, K+, and NY4+, where Y is a C1-C6 alkyl or alkenyl radical, and (c) water; which solutions are obtained by a process comprising (i) providing an aqueous solution of a silicate (waterglass) of the formula M2O×nSiO2, as above, where n=1-5, and (ii) fine filtering the solution over a filter element that is stable at pH values of 12 or more, at a temperature in the range of 20 to 140° C., provided that the filtrate solution has a turbidity of 4 FNU or less. The aqueous solutions are clear at temperatures below −10° C., and are storage-stable against turbidity for at least 1 month.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.