Cellulose carbamate process Traditional and ammonia-assisted methods Cellulose carbamate is alkali soluble at a substitution degree of 0.2 to 0.3. The formation of cellulose carbamate begins when the mixture of cellulose and urea is heated to a temperature exceeding the melting point of the latter (133 °C). When heated, urea decomposes to isocyanic acid and
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