Title:
低い粘度の水性セルロースエーテル溶液の製造方法
Document Type and Number:
Japanese Patent JP2004526845
Kind Code:
A
Abstract:
A process of preparing low-viscosity aqueous cellulose ether solutions is described. The process comprises: (a) dissolving high molecular weight cellulose ether in water to form a first solution; (b) admixing a catalytic amount of an acid into the first solution of step (a) to form a second solution; (c) subjecting the second solution of step (b) to high-frequency radiation having a frequency of 3 to 300,000 MHz, which results in raising the temperature of said second solution to a temperature of 60° C. to 150° C.; (d) cooling the frequency subjected second solution of step (c); and (e) neutralizing the cooled solution. Also described is a method of using the cellulose ether prepared in accordance with the method of the present invention as a coating material for solid pharmaceutical administration units, such as tablets.
Inventors:
Wolfgang Koch
Peter Volbers
Bernd Ondolshka
Matthias Nüchter
Peter Volbers
Bernd Ondolshka
Matthias Nüchter
Application Number:
JP2002579909A
Publication Date:
September 02, 2004
Filing Date:
April 04, 2002
Export Citation:
Assignee:
WOLFF WALSRODE AG
International Classes:
A61K47/38; A61K9/36; C08B11/02; C08B11/08; C08B11/193; C08B11/20; (IPC1-7): C08B11/20; A61K47/38; C08B11/02; C08B11/08; C08B11/193
Attorney, Agent or Firm:
Toshio Yano
Toshiomi Yamazaki
Takuya Kuno
Einzel Felix-Reinhard
Reinhard Einsel
Toshiomi Yamazaki
Takuya Kuno
Einzel Felix-Reinhard
Reinhard Einsel