Patent · US Expired

Process for the preparation and work-up of N-hydroxyalkylchitosans soluble in aqueous medium

US6090928A · kind A · utility

5Cited by

5References

12Claims

0Family size

Assignee

Clariant Corporation · DE

Inventors

Reinhard Donges · Bad Soden, DE
Diethart Reichel · Darmstadt, DE
Birgit Kessler · Frankfurt am Main, DE

Key dates

Filing date	Mar 24, 1994
Grant date	Jul 18, 2000
Priority date	—
Expiry date	Mar 24, 2014

Classification

Technology area (CPC F)Mechanical Engineering; Lighting; Heating
CPC primaryF26B3/12
WIPO fieldChemical engineering
WIPO sectorChemistry

Abstract

The present invention relates to a process for the preparation and work-up of N-hydroxyalkylchitosans soluble in aqueous media, comprising the measures PA1 dispersion of chitosan in an aqueous medium, PA1 subsequent hydroxyalkylation of the dispersed chitosan and PA1 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.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.