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:
Mar. 14, 2006
Filed:
Nov. 25, 2002
Hartwig Schlesiger, Fallingbostel, DE;
Wolfgang Dannhorn, Soltau, DE;
Jörn-bernd Pannek, Fallingbostel, DE;
Volkhardt Müller, Walsrode, DE;
Frank Höhl, Neuenkirchen, DE;
Hartwig Schlesiger, Fallingbostel, DE;
Wolfgang Dannhorn, Soltau, DE;
Jörn-Bernd Pannek, Fallingbostel, DE;
Volkhardt Müller, Walsrode, DE;
Frank Höhl, Neuenkirchen, DE;
Wolff Cellulosics GmbH & Co. KF, Walsrode, DE;
Abstract
A process for preparing cellulose ethers having delayed dissolution in water is described. The process comprises: (a) treating a moist cellulose ether with a solution comprising a dialdehyde; (b) adding an aqueous salt solution to the moist cellulose ether, such that said cellulose ether has a pH of from 6.0 to 8.0, the aqueous salt addition being performed at least one of, (i) prior to step (a), (ii) concurrently with step (a), and (iii) subsequent to step (a); and (c) drying and comminuting the treated cellulose ether of step (b). The cellulose ether, or mixtures of cellulose ethers, prepared by the method of the present invention may be used as protective colloids, thickeners and adhesives.