Procedure for manufacturing cellulose carbamate

Details Procedure for manufacturing cellulose carbamate Procedure for manufacturing cellulose carbamate

C - Chemistry, Metallurgy

08

B

260/215

C08B 5/00 (2006.01) C08B 15/06 (2006.01)

Patent

CA 1238042

Abstract of Disclosure 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°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°C, preferably at about 220°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.

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