Method for modified manufacture of cellulose carbamate

Details Method for modified manufacture of cellulose carbamate Method for modified manufacture of cellulose carbamate

1997-11-13

1999-05-25

Lilling, Herbert J.

Chemistry: molecular biology and microbiology

Micro-organism, tissue cell culture or enzyme using process...

Preparing compound containing saccharide radical

536 30, 536 32, C08B 1506

Patent

active

059069260

ABSTRACT:
A method for the manufacture of cellulose carbamate, whereby cellulose pulp is preliminarily activated by alkaline, hydrothermal and/or enzymatic treatment, then the activated cellulose pulp is mixed with aqueous urea solution, the water in the solution replaced with an organic reaction carrier, and thereafter the cellulose is reacted with urea in the liquid phase to yield cellulose carbamate, which is separated from the liquid medium and washed. The method results in uniform substitution and distribution of carbamate groups and in cellulose chain, which leads to good solubility of the cellulose carbamate in aqueous alkali solution as well as excellent spinnability for producing fibers, films, and other products.

REFERENCES:
patent: 2134825 (1938-11-01), Hill et al.
patent: 4404369 (1983-09-01), Huttunan et al.
patent: 5378827 (1995-01-01), Keunecke et al.

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