Patent ID: 7459015
Filing Date: 2008-12-02
Classification: D01F

Abstract:
1. An improved process for the preparation of a cellulose solution for spinning of fibres, filaments or films there from comprising in the steps of: i) activating cellulose in a mixture containing said cellulose, tertiary amine oxide solvent, activator and water for a period sufficient to allow a swelling of the cellulose by introduction therein of water present in said mixtures, to obtain activated cellulose, the temperature of said activation step and concentration of solvent being such that the solvent is not converted into its monohydrate state during the step of activation; ii) the activated cellulose being subjected to the steps of dissolution of cellulose in the solvent by heating under reduced pressure for removal of water so as to convert the solvent into at least its monohydrate form so as to cause a dissolution.