EP 1280829 A1 20030205 - PROCESS FOR PREPARING CHITOSAN PARTICLES
Title (en)
PROCESS FOR PREPARING CHITOSAN PARTICLES
Title (de)
VERFAHREN ZUR HERSTELLUNG VON CHITOSANPARTIKELN
Title (fr)
PREPARATION DE PARTICULES DE CHITOSANE
Publication
Application
Priority
- PL 34013200 A 20000512
- US 0115182 W 20010510
Abstract (en)
[origin: WO0187988A1] Disclosed is a process for producing particles of the modified carbohydrate polymer chitosan. Such chitosan particles are "activated" as a consequence of the specific steps used in the process. The process involves precipitation of dissolved chitosan from an acid solution thereof by the step-wise addition of neutralizing agent to the solution. A partial neutralization is carried out under shear agitation to form a continuous gel phase having a pH within the range of 5.0 to 6.9. This partially neutralized chitosan gel phase is then further subjected to shear agitation for at least 10 seconds to homogenize the gel phase. The homogenized gel phase is then further neutralized under shear agitation to a pH of above 6.9 to form a gel-like suspension of discrete chitosan particles. Chitosan particles in this form are useful in a number of contexts including, in particular, in the area of plant care.
IPC 1-7
C08B 37/08; C08L 5/08; C08J 3/07; C08J 3/14; A01N 25/04; A01N 43/16
IPC 8 full level
A01N 43/16 (2006.01); C08B 37/08 (2006.01); C08J 3/14 (2006.01); C08L 5/08 (2006.01)
CPC (source: EP)
A01N 43/16 (2013.01); C08B 37/003 (2013.01); C08J 3/14 (2013.01); C08L 5/08 (2013.01); C08J 2305/08 (2013.01)
Citation (search report)
See references of WO 0187988A1
Designated contracting state (EPC)
AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE TR
DOCDB simple family (publication)
WO 0187988 A1 20011122; AU 6304601 A 20011126; CA 2407584 A1 20011122; EP 1280829 A1 20030205; JP 2004501235 A 20040115; PL 340132 A1 20011119
DOCDB simple family (application)
US 0115182 W 20010510; AU 6304601 A 20010510; CA 2407584 A 20010510; EP 01937295 A 20010510; JP 2001585205 A 20010510; PL 34013200 A 20000512