Global Patent Index - EP 1237988 A1

EP 1237988 A1 2002-09-11 - METHOD FOR PRODUCING NANOPARTICULATE CHITOSANS OR CHITOSAN DERIVATIVES

Title (en)

METHOD FOR PRODUCING NANOPARTICULATE CHITOSANS OR CHITOSAN DERIVATIVES

Title (de)

VERFAHREN ZUR HERSTELLUNG VON NANOPARTIKULÄREN CHITOSANEN ODER CHITOSAN-DERIVATEN

Title (fr)

PROCEDE DE PREPARATION DE CHITOSANES OU DE DERIVES DE CHITOSANE NANOPARTICULAIRES

Publication

EP 1237988 A1 (DE)

Application

EP 00972819 A

Priority

  • DE 19952073 A
  • EP 0010330 W

Abstract (en)

[origin: WO0132751A1] The invention relates to a method for producing nanoparticulate chitosans or chitosan derivatives with particle diameters in the range of from 10 to 1000 nm. According to the inventive method, (a) the chitosan or chitosan derivative is dissolved in an acidic aqueous medium and (b) the pH of the solution is raised in the presence of a surface modifier to such an extent that the chitosan is precipitated. The invention allows for the production of non-agglomerating nanoparticles in dispersed or dry form in a simple manner and independent of organic solvents.

IPC 1-7 (main, further and additional classification)

C08J 3/14; A61K 7/00; A61K 9/16; A61K 47/36; C08L 5/08

IPC 8 full level (invention and additional information)

B82B 3/00 (2006.01); A61K 8/04 (2006.01); A61K 8/72 (2006.01); A61K 8/73 (2006.01); A61K 9/00 (2006.01); A61K 47/36 (2006.01); A61Q 19/00 (2006.01); C08B 37/08 (2006.01); C08J 3/14 (2006.01); C08L 5/08 (2006.01); A61K 9/51 (2006.01)

CPC (invention and additional information)

A61K 9/5161 (2013.01); A61K 8/0241 (2013.01); A61K 8/736 (2013.01); A61K 9/0014 (2013.01); A61K 9/5192 (2013.01); A61Q 19/00 (2013.01); B82Y 5/00 (2013.01); C08B 37/003 (2013.01); C08J 3/14 (2013.01); C08L 5/08 (2013.01); A61K 47/36 (2013.01); A61K 2800/413 (2013.01); C08J 2305/08 (2013.01)

Citation (search report)

See references of WO 0132751A1

Designated contracting state (EPC)

AT BE CH CY DE ES FR GB IT LI

EPO simple patent family

WO 0132751 A1 20010510; DE 19952073 A1 20010712; EP 1237988 A1 20020911; JP 2003514046 A 20030415

INPADOC legal status


2005-11-02 [18D] APPLICATION DEEMED TO BE WITHDRAWN

- Effective date: 20050503

2004-05-26 [RBV] DESIGNATED CONTRACTING STATES (CORRECTION)

- Designated State(s): AT BE CH CY DE ES FR GB IT LI

2002-09-11 [17P] REQUEST FOR EXAMINATION FILED

- Effective date: 20020420

2002-09-11 [AK] DESIGNATED CONTRACTING STATES:

- Kind Code of Ref Document: A1

- Designated State(s): AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE