PROCESS FOR THE PREPARATION AND WORK-UP OF N-HYDROXYALKYLCHITOSANS SOLUBLE IN AQUEOUS MEDIUM

摘要

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.