Organic compounds -- part of the class 532-570 series – Organic compounds – Carbohydrates or derivatives
Patent
1978-09-01
1980-04-01
Griffin, Ronald W.
Organic compounds -- part of the class 532-570 series
Organic compounds
Carbohydrates or derivatives
106168, 106176, 536 57, C08B 1600
Patent
active
041962826
ABSTRACT:
An improved process is provided for making a precipitated cellulose product wherein cellulose is dissolved in a solvent containing both a tertiary amine N-oxide solvent and water and precipitated therefrom with water or other non-solvent for cellulose. The water content of the solution may be adjusted to any level of up to about 29% by weight with the amount of water decreasing substantially linearly as the cellulose is increased. A solution substantially free from undissolved cellulose and solid tertiary amine N-oxide which is adapted to be spun, extruded or molded at a temperature below the melting point of the tertiary amine N-oxide can be prepared with a solvent which contains water within a specified critical range mixed with the tertiary amine N-oxide. Preferably, N,N,N-triethylamine N-oxide or a tertiary amine N-oxide having a cyclic or pseudo-cyclic molecular structure is mixed with water to form the solvent.
REFERENCES:
patent: 2179181 (1939-11-01), Granacher et al.
patent: 2744292 (1956-05-01), Schlosser et al.
patent: 3447939 (1969-06-01), Johnson
patent: 3508941 (1970-04-01), Johnson
patent: 3758457 (1973-09-01), Broeck et al.
Franks Neal E.
Varga Julianna K.
Akzona Incorporated
Griffin Ronald W.
Hall Jack H.
Young Francis W.
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