Patent ID: 6590095
Filing Date: 2003-07-08
Classification: C08B,D01F

Abstract:
A process for preparing a cellulose carbamate solution, the process comprisinga) preparing an 8% to 15% cellulose carbamate solution with a sodium hydroxide concentration of 7% to 12% by dissolving cellulose carbamate in a sodium hydroxide solution at a temperature of less than 10Â° C., and b) adjusting the sodium hydroxide concentration of the cellulose carbamate solution to a concentration that is less than the concentration in a) and less than 9% by adding to the cellulose carbamate solution either i) a single diluent comprising a dilute sodium hydroxide solution or water, or ii) a first diluent followed by a second diluent, wherein one of said diluents is water and the other is a dilute sodium hydroxide solution, provided that the weight ratio of cellulose carbamate to sodium hydroxide in both (a) and (b) is greater than 1.