公开(公告)号：CA2159045A1

公开(公告)日：1996-03-27

申请号：CA2159045

申请日：1995-09-25

Applicant: HOECHST AG

Inventor： DOENGES REINHARD ,  REICHEL DIETHART

IPC: A61K8/72 ,  A61K8/73 ,  A61K9/28 ,  A61K9/36 ,  C08B11/00 ,  C08B11/02 ,  C08B11/20 ,  C09D101/28 ,  A61K7/00 ,  C08F2/24 ,  C09D101/26 ,  C04B35/626

Abstract: Low molecular weight cellulose ethers which are suitable as a coating material for solid metered units and as an additive in ceramic compositions or cosmetics formulations or as a polymerization auxiliary are obtained by irradiation of a mixture of a higher molecular weight cellulose ether and a base with electrons.

公开(公告)号：NO941114A

公开(公告)日：1994-09-28

申请号：NO941114

申请日：1994-03-25

Applicant: HOECHST AG

Inventor： DONGER REINHARD ,  REICHEL DIETHART ,  KESSLER BIRGIT

IPC: C08B37/08 ,  F26B3/12 ,  F26B17/28

CPC classification number: F26B17/284 ,  C08B37/003 ,  F26B3/12

公开(公告)号：CA2119967A1

公开(公告)日：1994-09-28

申请号：CA2119967

申请日：1994-03-25

Applicant: HOECHST AG

Inventor： DOENGES REINHARD ,  REICHEL DIETHART ,  KESSLER BIRGIT

IPC: C08B37/08 ,  F26B3/12 ,  F26B17/28

Abstract: of the disclosure Process for the preparation and work-up of N-hydroxy-alkylchitosans soluble in aqueous medium The present invention relates to a process for the preparation and work-up of N-hydroxyalkylchitosans soluble in aqueous media, comprising the measures - dispersion of chitosan in an aqueous medium, - subsequent hydroxyalkylation of the dispersed chitosan and - subsequent work-up of the N-hydroxyalkylchitosan, which comprises carrying out the hydroxyalkylation up to an average degree of substitution (DS) of 2.0, preferably 1.5 to 2.0, if desired removing some of the aqueous medium after the hydroxyalkylation and before the work-up and performing the work-up of the N-hydroxyalkylchitosan by drying.

公开(公告)号：MX9302331A

公开(公告)日：1993-12-01

申请号：MX9302331

申请日：1993-04-21

Applicant: HOECHST AG

Inventor： REICHEL DIETHART

IPC: C08B11/02 ,  C08B11/08 ,  C08B11/193 ,  C07C59/11

公开(公告)号：NO941114L

公开(公告)日：1994-09-28

申请号：NO941114

申请日：1994-03-25

Applicant: HOECHST AG

Inventor： DONGER REINHARD ,  REICHEL DIETHART ,  KESSLER BIRGIT

IPC: C08B37/08 ,  F26B3/12 ,  F26B17/28

Abstract: The present invention relates to a process for the preparation and workup of N-hydroxyalkylchitosans which are soluble in aqueous medium, comprising the measures of dispersion of chitosan in an aqueous medium, subsequent hydroxyalkylation of the dispersed chitosan and subsequent workup of the N-hydroxyalkylchitosan, which is characterised in that the hydroxyalkylation is carried out up to an average degree of substitution (DS) of 2.0, preferably 1.5 to 2.0, after the hydroxyalkylation and before the workup a part of the aqueous medium is removed where appropriate, and the workup of the N-hydroxyalkylchitosan takes place by drying.

公开(公告)号：NO941114D0

公开(公告)日：1994-03-25

申请号：NO941114

申请日：1994-03-25

Applicant: HOECHST AG

Inventor： DONGER REINHARD ,  REICHEL DIETHART ,  KESSLER BIRGIT

IPC: C08B37/08 ,  F26B3/12 ,  F26B17/28

Abstract: The present invention relates to a process for the preparation and workup of N-hydroxyalkylchitosans which are soluble in aqueous medium, comprising the measures of dispersion of chitosan in an aqueous medium, subsequent hydroxyalkylation of the dispersed chitosan and subsequent workup of the N-hydroxyalkylchitosan, which is characterised in that the hydroxyalkylation is carried out up to an average degree of substitution (DS) of 2.0, preferably 1.5 to 2.0, after the hydroxyalkylation and before the workup a part of the aqueous medium is removed where appropriate, and the workup of the N-hydroxyalkylchitosan takes place by drying.