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Title
Verfahren zur Herstellung von Celluloseacetatphosphat oder Celluloseacetatsulfat (Celluloseacetatmischester) mit definierter Molekuelstruktur und die Verwendung der erhaltenen Celluloseacetatmischester zur Herstellung von Cellulosephosphat bzw. Cellulosesulfat
Date Issued
1996
Author(s)
Wagenknecht, W.
Patent No
1994-4435082
Abstract
The invention relates to a process for the production of cellulose acetate phosphate or cellulose acetate sulphate (cellulose acetate mixing ester) having a defined molecular structure of the anhydroglucose unit (AGU) in the C<-2, C<-3 and C<-6 positions, by means of the deacetylization of cellulose triacetate (CTA) followed by the esterification, said process having the following process steps: a) that CTA is dissolved in an aprotic polar solution, b) that deacetylization takes place by adding amine to the CTA solution, whereby the degree of deacetylization is adjustable by selecting the deactelyzation time in the range of 0.5 to 72 hours and/or the temperature in the range of 20 to 100 degrees C, c) that the deactetylized CTS is isolated, d) that this is followed by esterification of the deacetylized CTA in a more or less known way.
Language
de
Patenprio
DE 1994-4435082 A: 19940930