Process for the preparation of solutions of cellulose derivative

Details Process for the preparation of solutions of cellulose derivative Process for the preparation of solutions of cellulose derivative

1979-02-23

1980-12-02

Griffin, Ronald W.

Organic compounds -- part of the class 532-570 series

Organic compounds

Carbohydrates or derivatives

106163R, 106168, 106187, 536 57, C08B 1600, C08L 102

Patent

active

042372747

ABSTRACT:
A process for the preparation of solutions of cellulose derivatives from which formed bodies, such as fibres or films, of regenerated cellulose can be obtained by coagulation and regeneration, e.g. by wet spinning, is disclosed. The cellulose is transformed into a methylol derivative containing more than 2 units of formaldehyde per anydroglucosidic unit, which derivative is soluble in organic solvents of the class consisting of polar aprotic solvents constituted by N-substituted amides, pyridine and formamide. The methylol derivative is prepared by treating cellulose with paraformaldehyde and dimethylsulphoxide. The methylol derivative is then dissolved in one of the aforesaid solvents, preferably dimethylformamide or dimethylacetamide, to provide spinnable viscous solutions from which formed bodies can be obtained, e.g. by spinning in an aqueous alkaline bath.

REFERENCES:
patent: 3776692 (1973-12-01), Franklin et al.
patent: 4022631 (1977-05-01), Turbak et al.
patent: 4056675 (1977-11-01), Turbak et al.
patent: 4086418 (1978-04-01), Turbak et al.
patent: 4097666 (1978-06-01), Johnson et al.
patent: 4145391 (1979-03-01), Rodier
Polymer, 1977, vol. 18, Feb., pp. 203 and 204.
"Solvent Spun Rayon, Modified Cellulose Fibers and Derviatives," Turbak, tor, Symposium, Mar. 21-23 1977, pp. 21 & 74.
Hergert, Hammer and Turbak, article "New Methods for Preparing Rayon", presented at the 4th International TAPPI Conference in Chicago, 1977, pp. 28-34.

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