Method of producing cellulose carbamate

Details Method of producing cellulose carbamate Method of producing cellulose carbamate

1985-03-12

1986-01-28

Griffin, Ronald W.

Organic compounds -- part of the class 532-570 series

Organic compounds

Carbohydrates or derivatives

C08B 1506

Patent

active

045672555

ABSTRACT:
The invention is directed to a procedure for manufacturing cellulose carbamate by reacting isocyanic acid and cellulose at elevated temperature. In the procedure, 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. for a sufficient time 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 accomplished at 170.degree.-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.

REFERENCES:
patent: 4404369 (1983-09-01), Huttunen et al.
patent: 4456749 (1984-06-01), Mandell et al.
patent: 4486585 (1984-12-01), Turunen et al.
patent: 4526620 (1985-07-01), Selin et al.
patent: 4530999 (1985-07-01), Selin et al.

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