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US 6,475,419 B1Granted
Auxiliary agent for the production of cellulose fibers
AssigneeCognis Deutschland GmbH & Co. KG
InventorsMartin Lagarden, Raymond Mathis, Ursula Kolken
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AssigneeCognis Deutschland GmbH & Co. KG
InventorsMartin Lagarden, Raymond Mathis, Ursula Kolken
Estimating the term…
Methods of preparing cellulose materials, which methods comprise (a) reacting a cellulosic material with a first basic component to form alkli cellulose; (b) reacting the alkali cellulose with carbon disulfide and a second basic component to form a cellulose xanthate solution; and (c) extruding the cellulose xanthate into an aqueous coagulation bath; wherein a reaction product of an epoxide of the general formula (I): wherein R1 represents a linear or branched aliphatic alkyl group having from about 1 to about 22 carbon atoms, and an amine compound of the general formula (II): wherein R2 and R3 each independently represent a substituent selected from the group consisting of —CnH2n—O)m—H, alkyl groups having from about 1 to about 22 carbon atoms, and hydrogen, wherein n represents 2 or 3 and m represents a number of from about 1 to about 20; is present in at least one of the cellulose xanthate solution and the aqueous coagulation bath, are described. Cellulose xanthate solutions and aqueous coagulation baths containing such reaction products are also described.
A mixture comprising a cellulose xanthate and a reaction product of an epoxide of the general formula (I):
The mixture according to claim, 1, wherein the reaction product is present in an amount of from about 1 to about 5% by weight, based on the amount of cellulose present.
An aqueous coagulation bath comprising water, a protic acid and a reaction product of an epoxide of the general formula (I):
A method of preparing a cellulose material, said method comprising:
A method of reducing clogging of extrusion pathways during the formation of cellulose materials, said method comprising combining a cellulose xanthate solution with a reaction product of an epoxide of the general formula (I):
Dependencies are inferred from the claim text.