The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jun. 11, 2013
Filed:
Sep. 28, 2010
Ralf Bohlander, Erkrath, DE;
Ralf Bohlander, Erkrath, DE;
Cognis IP Management GmbH, Duesseldorf, DE;
Abstract
The invention relates to a process for preparing clear aqueous solutions of silicates, remaining stable at 20° C. on storage for at least 6 months, containing 20% to 40% by weight SiO, 10% to 20% by weight MO, where M is a cation from the group consisting of Li, Na, Kand NY4and Y is an alkyl or alkenyl radical having 1 to 6 C atoms, 0.5% to 6% by weight AlOand 100% by weight water, by introducing an aqueous solution of a silicate of the general formula MO x nSiO, in which M is a cation from the group consisting of Li, Na, Kand NY4, and where Y is an alkyl or alkenyl radical having 1 to 6 C atoms, and n is a number in the range from 1 to 5, and metering in an aluminium compound in such a way that the viscosity of the reaction mixture remains below 10 000 mPas, and the reaction being carried out in a temperature range from 20 to 140° C., with the proviso that, following the metered addition of the total amount of the aluminium compound, the reaction mixture is cooled to room temperature as soon as the reaction mixture is clear.