BigPatents India

An improved process for making cellulose fibers, filaments or films which comprises the in the steps of: i. activating cellulose in a mixture of containing 7-28% cellulose, 65-80% tertiary amine oxide and 5-15% water for a period sufficient to allow a swelling of the cellulose by water present in said mixture, the temperature of said activation step and concentration of solvent being such that the solvent is not converted into its monohydrate state during step of activation; ii. the cellulose-amine oxide mixture being subjected to the step of heating for removal of water to convert the solvent into at least its monohydrate form to cause a dissolution of the cellulose in the solvent; iii. extruding the cellulose as fibres, filaments or films using dry jet- wet spinning method which is stretched in air gap of 5-1000 mm to develop molecular orientation. iv. Regenerating the spun filaments in an aqueous spin bath containing 1-40% NMMO at a temperature of 5-60Û&DQGWKHVKDSHGDUWLFOHVDUHZDVKHGIUHHRIDPLQR[LGHEOHDFKHGILQLVKHGDQGGULHG Drawing: NIL Total Pages: 22 Fig. Nil