Process for the manufacture of cellulosic fibers; and cellulosic fibers
AssigneeAkzo Nobel N.V.
InventorsHans-Jurgen Pitowski, Ulrich Wigand Wachsmann
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Abstract
Cellulosic fibers made from a solution of cellulose in a tertiary amine oxide and optionally water and which have a low tendency to fibrillate are produced by coagulating the fibers in at least two stages. The residence time of the fibers in the first coagulation stage is adjusted so that on leaving the first coagulation stage only the adhesiveness of the surface of the solution formed into fibers has been counteracted. In subsequent coagulation stages, the fibers are kept in a slack state. On leaving the final coagulation stage, the fibers have been thoroughly coagulated. The cellulosic fibers have a new structure and apart from a very low tendency to fibrillate, they possess a high dyeing level.
Claims20
Process for the manufacture of cellulosic fibers, comprising
- forming a solution comprised of cellulose in a tertiary amine oxide and optionally water into fibers through a spinneret,
- coagulating the fibers with a coagulation medium in at least two stages, wherein the residence time of the fibers in a first coagulation stage is adjusted so that on leaving the first coagulation stage only the adhesiveness of a surface of the solution formed into fibers has been counteracted, wherein in subsequent coagulation stages the fibers are kept in a slack state, and wherein the fibers leaving a final coagulation stage have been thoroughly coagulated, and
- subsequently washing and drying the fibers.
Dependencies are inferred from the claim text.