C - Chemistry – Metallurgy – 03 – C
Patent
C - Chemistry, Metallurgy
03
C
C03C 3/062 (2006.01)
Patent
CA 2731004
Aqueous solutions of silicates (waterglasses) comprising .cndot. 20 to 40% by weight of SiO2, .cndot. 10 to 30% by weight of M2O, where M is a cation from the group Li+, Na+, K+, NY4+ and Y is an alkyl or alkenyl radical having 1 to 6 carbon atoms, .cndot. water, and which are obtainable by initially introducing an aqueous solution of a silicate (waterglass) of the general formula M2O x nSiO2, in which M is a cation from the group Li+, Na+, K+, NY4+ and where Y is an alkyl or alkenyl radical having 1 to 6 carbon atoms and n is a number in the range from 1 to 5, and carrying out a fine filtration over a filter element that is stable at pH values of 12 or more in a temperature range from 20 to 140°C, with the proviso that the filtrate solution has a turbidity of 4 FNU or less, where the FNU values are measured in accordance with DIN EN ISO 7027, are clear even at temperatures below -10°C and are storage- stable against turbidity for at least 1 month.
Bohlander Ralf
Muckenfuss Silke
Ziervogel Ruediger
Cognis Ip Management Gmbh
Norton Rose Or S.e.n.c.r.l. S.r.l./llp
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