Process for producing regenerated cellulosic fibers
AssigneeInternational Telephone and Telegraph Corporation
InventorsAlbin Frank Turbak, Richard Benjamin Hammer
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Abstract
Regenerated cellulosic fibers of improved resistance to alkaline treatment are produced by nitrosating and dissolving from 5 to 14% by weight of a cellulosic material in a dialkylacylamide solvent while said solution is maintained at a temperature no greater than 20.degree. C to form a cellulose nitrite ester, and regenerating the cellulose by contacting the cellulose ester with a regenerant. Regeneration of the cellulose occurs before significant oxidation of the cellulose takes place.
Claims6
A process for producing a regenerated cellulosic fiber of improved alkaline resistance comprising
- nitrosating cellulose with a nitrosating agent selected from the group consisting of an oxide of nitrogen and nitrosyl chloride and dissolving from 5 to 14% by weight of the cellulose in a dialkylacylamide solvent to form a solution of cellulose nitrite ester while said solution is maintained at a temperature no greater than 20.degree. C. and
- regenerating said cellulose by contacting the cellulose ester solution with a regenerant therefor containing a protonic group, the time at temperature of said cellulose ester solution from completion of dissolution to regeneration ranging from a maximum of 2 hours at a temperature not exceeding 20.degree. C. to a maximum of 60 hours at a temperature below 0.degree. C., said regeneration occurring before significant oxidation of said cellulose takes place.
Dependencies are inferred from the claim text.