PROCEDURE FOR MANUFACTURING CELLULOSE CARBAMATE

摘要

The invention provides a method for manufacturing cellulose carbamate by reacting isocyanic acid and cellulose at elevated temperature. In the method, cellulose to which biuret or a mixture of biuret and urea has been admixed, or absorbed, is heated at a temperature over 170.degree.C long enough to produce a quantity of isocyanic acid sufficient for formation of the cellulose carbamate and for accomplishing the reaction between cellulose and isocyanic acid. The heating is done at 170-250.degree.C, preferably at about 220.degree.C.The biuret quantity is 3-50% by weight of the cellulose weight and the urea quantity is 0-95% by weight of the cellulose weight.