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:
Aug. 21, 2007
Filed:
Feb. 16, 2001
Hartwig Schlesiger, Fallingbostel, DE;
Martin Morning, Bomlitz, DE;
Gunter Weber, Fallingbostel, DE;
Volker Eckhardt, Walsrode, DE;
Gerd Sonnenberg, Walsrode, DE;
René Kiesewetter, Fallingbostel, DE;
Hartwig Schlesiger, Fallingbostel, DE;
Martin Morning, Bomlitz, DE;
Gunter Weber, Fallingbostel, DE;
Volker Eckhardt, Walsrode, DE;
Gerd Sonnenberg, Walsrode, DE;
René Kiesewetter, Fallingbostel, DE;
Wolff Walsrode AG, Walsrode, DE;
Abstract
The present invention relates to a new, particularly economical process for preparing particulate water-soluble cellulose derivatives. The process involves forming a feed composition of swollen and/or dissolved cellulose derivative, and water. The feed composition is contacted with a superheated gas mixture, in a sieve-free high rotational speed gas jet impact mill, and the cellulose derivative of the feed composition is converted into a solid state form of finely particulate particles. The superheated gas mixture, with which the feed composition is contacted, is selected from: (i) a superheated gaseous mixture of steam and an inert gas; and (ii) a superheated gas mixture of steam and air. The superheated gas mixture has a steam content of 40 wt. % to 99 wt. %, based on the total weight of the superheated gas mixture.