| 摘要 |
PROBLEM TO BE SOLVED: To obtain the subject cellulose capable of reducing the amount of propylene oxide while maintaining qualities, excellent not only in an economical aspect but also in an environmental aspect, useful as a medicine additive by using a cellulose having a high relative viscosity. SOLUTION: (B) Propylene oxide is added to (A) a cellulose of formula I (n is 100-2,000) having >=12 relative viscosity to give the objective cellulose of formula II [R is (CH2-CH(CH3)-O)m--H] (m is 0 or 1-5). Preferably 1 pt.wt. of the component A is reacted with <=2.5 pts.wt. of the component B. For example, the component A, an organic solvent such as toluene, etc., an aqueous solution of sodium hydroxide are fed to a reactor, mixed and the mixed solution is reacted with the component B.
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