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:
Apr. 29, 1986
Filed:
May. 09, 1985
Hans-Peter Rieck, Hofheim am Taunus, DE;
Hoechst Aktiengesellschaft, , DE;
Abstract
A process for the preparation of crystalline sodium silicates with a molar ratio SiO.sub.2 /Na.sub.2 O of 1.9:1 to 3.5:1 from amorphous sodium silicate is described. To water-containing amorphous sodium silicate with a molar ratio SiO.sub.2 /Na.sub.2 O of 1.7:1 to 3.75:1 and a water content of 5 to 95% by weight is added 0.01 to 30 parts by weight of the crystalline sodium silicate to be prepared (per 100 parts by weight of Na.sub.2 O+SiO.sub.2 in the water-containing amorphous sodium silicate). The reaction mixture is dehydrated by heating. The dehydrated reaction mixture is kept at a temperature of at least 450.degree. C., but below the melting point, until the sodium silicate has crystallized.