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:
Jul. 10, 2007
Filed:
Aug. 20, 2002
Harald Jakob, Hasselroth, DE;
Waldemar Hessberger, Alzenau, DE;
Juergen Lattich, Nidderau, DE;
Ralph Overdick, Hofheim, DE;
Harald Jakob, Hasselroth, DE;
Waldemar Hessberger, Alzenau, DE;
Juergen Lattich, Nidderau, DE;
Ralph Overdick, Hofheim, DE;
Degussa GmbH, Düsseldorf, DE;
Abstract
The invention relates to a process for the preparation of coated granular sodium percarbonate having a low TAM value. The preparation is carried out by fluidized-bed spray granulation at a temperature Tin the range from 45 to 75° C., and the coating is effected by the spray application of an aqueous solution containing at least one coating component in a fluidized bed at a temperature Tin the range from 35 to 100° C. According to the invention, a) after the fluidized-bed spray granulation but before the coating, drying is carried out at Tof greater than T, or b) the fluidized-bed granulation is carried out in at least two steps at T, T. . . T, Tor Tbeing higher than T1, and drying being unnecessary if ⅔ of the granulate have been formed at T1, or c) drying takes place not after the granulation but after the coating, at T, Tbeing at least 20° C. higher than T.