Process for the dissolution of cellulose in organic solvents, so

Details Process for the dissolution of cellulose in organic solvents, so Process for the dissolution of cellulose in organic solvents, so

1979-03-29

1981-05-19

Griffin, Ronald W.

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

Organic compounds

Carbohydrates or derivatives

106168, 106187, 106203, 536 56, C08B 1600, C08L 102, C08L 108

Patent

active

042686660

ABSTRACT:
A process for the dissolution of cellulose in organic solvents such as dihylformamide, dimethylacetamide, and N-methylpyrrolidone is described which comprises contacting the cellulose with an excess of paraformaldehyde and with the solvent at elevated temperatures, preferably higher than 115.degree. C. The amount of paraformaldehyde used preferably corresponds to at least 13 CH.sub.2 O units per anhydroglucosidic unit of the cellulose. The solution obtained can be rendered stable at room temperature by heating it under stirring to lower the paraformaldehyde content, preferably to not less than 8 CH.sub.2 O units per anhydroglucosidic unit. Formed bodies of regenerated cellulose can be obtained from said solutions by coagulating them in an aqueous bath, which may be alkaline or may be a mixture of water and the solvent of the solution, or even by evaporating the solvent.

REFERENCES:
patent: 1234720 (1917-07-01), Bloch-Pimentel
patent: 4022631 (1977-05-01), Turbak et al.
patent: 4076932 (1978-02-01), Hammer et al.
patent: 4097666 (1978-06-01), Johnson et al.
patent: 4129451 (1978-12-01), Menault et al.
patent: 4129640 (1978-12-01), Rodier
patent: 4145532 (1979-03-01), Franks et al.

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